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Given the large number of topics (54 items), I'll answer all of them directly from my medical knowledge. These are well-established anatomy and surgery topics from upper limb anatomy.

Upper Limb Anatomy & Surgery - All 54 Topics

1. Sprengel's Shoulder

Congenital undescended scapula - the scapula fails to descend from its embryonic cervical position to the thoracic region during fetal development. The scapula is elevated, small, and rotated, causing restricted shoulder abduction. It may be associated with an omovertebral bone connecting the scapula to the cervical spine. Klippel-Feil syndrome is a common association.

2. Lake of Marcelli (Lacuna of Marcelli / Foramen of Marcelli)

This refers to a venous communication in the axillary region - specifically the junction of the cephalic vein with the axillary vein, where a small depression or lacuna is seen. It is clinically relevant during axillary lymph node dissection in breast surgery, as the cephalic vein can be identified and preserved at this point.

3. Amelia, Polymelia

Amelia is the complete absence of one or more limbs due to failure of limb bud development during the 4th-5th week of embryogenesis (often caused by thalidomide or genetic defects). Polymelia is the presence of extra (supernumerary) limbs, resulting from abnormal limb bud duplication. Both are rare congenital anomalies of limb formation.

4. Amastia, Polymastia

Amastia is the complete absence of breast tissue due to failure of the mammary ridge (milk line) to develop. Polymastia refers to accessory or supernumerary breast tissue anywhere along the milk line (axilla to groin), the most common site being the axilla. These are anomalies of the mammary ridge (line of Schultze).

5. Gynaecomastia

Enlargement of male breast glandular tissue due to imbalance between estrogen (stimulatory) and androgen (inhibitory) effects. Causes include puberty, liver cirrhosis (reduced estrogen metabolism), drugs (spironolactone, digoxin, cimetidine), and testicular tumors. It is distinguished from pseudogynaecomastia (fatty tissue only) by the firm, rubbery glandular disc palpable beneath the nipple.

6. Mammogram

A low-dose X-ray examination of the breast used for screening and diagnosis of breast pathology. Screening mammography detects lesions before they are palpable. Important findings include microcalcifications, stellate masses, and architectural distortion. The BIRADS classification (1-6) grades findings. Standard views are the craniocaudal (CC) and mediolateral oblique (MLO) views.

7. Peau d'Orange

French for "skin of an orange" - describes a dimpled, pitted appearance of the breast skin resembling orange peel. Caused by cutaneous lymphedema: tumor cells block the dermal lymphatics, causing fluid accumulation and tethering of skin at the hair follicle orifices. It is a sign of advanced (locally advanced) breast cancer or inflammatory breast carcinoma.

8. Winging of Scapula

Protrusion (winging) of the medial border of the scapula away from the thoracic wall. Caused by paralysis of serratus anterior (innervated by the long thoracic nerve - C5, C6, C7). The serratus anterior holds the scapula against the chest wall; its loss causes medial winging. Tested by asking the patient to push against a wall - the scapula wings out prominently.

9. Fibrous Flexor Sheath

A fibro-osseous tunnel on the palmar aspect of each finger that encloses the flexor tendons (FDP + FDS) along with a synovial sheath. It is formed by annular (A1-A5) and cruciate (C1-C3) pulleys. The A2 and A4 pulleys are the most important biomechanically and must be preserved during tendon surgery. The sheath maintains tendon excursion and prevents bowstringing.

10. Klumpke's Paralysis

Paralysis due to injury to the lower trunk of the brachial plexus (C8, T1). Typically caused by forceful arm traction upward (e.g., grabbing a branch to break a fall). Results in paralysis of intrinsic hand muscles (thenar, hypothenar, interossei) and long finger flexors, causing a "claw hand." T1 sympathetic fiber involvement causes ipsilateral Horner's syndrome. Sensation is lost on the medial forearm and hand.

11. Cervical Rib Syndrome

A cervical rib (extra rib from C7) or fibrous band causes thoracic outlet syndrome by compressing the lower trunk of brachial plexus (C8, T1) and/or the subclavian artery/vein. Neurological features include wasting of intrinsic hand muscles and medial forearm/hand paresthesia. Vascular features include subclavian artery aneurysm, thrombosis, or Raynaud's phenomenon. Adson's test may be positive.

12. Horner's Syndrome

A triad of ptosis (drooping eyelid), miosis (constricted pupil), and anhidrosis (absence of sweating) on the ipsilateral face, due to interruption of the sympathetic chain (T1 fibers). In the upper limb context, it occurs with Klumpke's palsy (C8, T1 injury) or Pancoast tumor. The sympathetic pathway passes through T1 root, stellate ganglion, and runs along the carotid artery.

13. Rotator Cuff Injury

The rotator cuff consists of four muscles: Supraspinatus, Infraspinatus, Teres Minor, and Subscapularis (SITS). Supraspinatus is most commonly torn (at its critical zone of avascularity near the greater tuberosity). Causes include impingement, degeneration, or acute trauma. Presents with painful shoulder and weakness of abduction. Diagnosed by MRI. Treatment ranges from physiotherapy to surgical repair.

14. Painful Arc Syndrome

Pain occurring specifically between 60-120 degrees of shoulder abduction (the painful arc), caused by impingement of the supraspinatus tendon and subacromial bursa between the humeral head and the coracoacromial arch. Pain typically begins at 60°, peaks around 90°, and diminishes beyond 120°. Associated with rotator cuff tendinitis or a partial thickness tear. Hawkins and Neer tests are positive.

15. Dawbarn's Sign

A clinical sign for subacromial bursitis: tenderness is present over the subacromial region when the arm is by the side (bursa exposed), but disappears when the arm is abducted to 90° (bursa slides under the acromion and is no longer palpable). This localizes tenderness specifically to the subacromial bursa rather than the acromioclavicular joint or greater tuberosity.

16. Recurrent Dislocation of Shoulder

Repeated anterior dislocation of the glenohumeral joint following an initial traumatic dislocation. It occurs because the labrum and capsule (Bankart lesion - detachment of anterior-inferior labrum) and/or the posterior humeral head (Hill-Sachs lesion - compression fracture) are not adequately healed. The shoulder is the most commonly dislocated joint due to its shallow glenoid and wide range of motion. Bankart repair is the standard surgical treatment.

17. Saturday Night Palsy

Radial nerve palsy from compression in the spiral groove of the humerus, classically from sleeping with the arm draped over a chair (or bench) while intoxicated (Saturday night). Results in wrist drop and finger drop (inability to extend wrist and fingers), with loss of sensation over the dorsum of the hand (anatomical snuff box area). Triceps is spared because its branch arises above the spiral groove.

18. Crutch Paralysis

Compression of the radial nerve in the axilla by the crutch top pressed against the medial arm wall. Results in wrist drop and finger drop, similar to Saturday night palsy, but differs in that the triceps (and sometimes long head of triceps) is also affected since the compression is proximal to the spiral groove. Proper crutch fitting (weight through the hand, not the axilla) prevents this.

19. Struthers' Ligament

An anomalous ligament running from a supracondylar process (bony spur on the anteromedial humerus, 5cm above medial epicondyle) to the medial epicondyle. The median nerve and brachial artery pass beneath it, and compression here causes pronator syndrome (proximal median nerve entrapment). Found in about 1% of people. Must be differentiated from the arcade of Struthers (related to ulnar nerve).

20. Axillary Nerve Injury

The axillary nerve (C5, C6) winds around the surgical neck of the humerus and can be injured in shoulder dislocation or surgical neck fractures. Results in paralysis of the deltoid (loss of shoulder abduction 15-90°) and teres minor. Sensory loss over the "regimental badge" area (lateral upper arm). Clinically: the shoulder appears flattened. Most cases recover spontaneously within 3-6 months.

21. Supracondylar Fracture of Humerus

The most common elbow fracture in children (Gartland classification I-III). The fracture line passes just above the condyles. The anterior interosseous nerve (branch of median nerve) and radial artery are at risk. Posterolateral displacement of the distal fragment is most common. Most feared complication is Volkmann's ischemic contracture due to brachial artery injury. Treatment: type I - cast; types II-III - closed reduction and K-wire fixation.

22. Volkmann's Ischemic Contracture

End result of compartment syndrome of the forearm, most commonly following supracondylar fracture in children. Ischemia of forearm flexor muscles (flexor digitorum profundus and flexor carpi ulnaris) leads to fibrosis and contracture. Classic deformity: flexion of wrist and fingers, pronation of forearm. Classified by severity (Tsuge classification: mild, moderate, severe). Prevention involves early fasciotomy; treatment of established contracture requires muscle slide or free muscle transfer.

23. Myositis Ossificans

Heterotopic bone formation within muscle, typically following trauma (elbow injury, dislocation, or repeated trauma). Most common around the elbow (brachialis muscle) and thigh. The ectopic bone formation occurs due to activation of osteoprogenitor cells. It presents as a painful, hard mass developing 2-4 weeks after injury. X-ray shows peripheral calcification with radiolucent center (differentiates from osteosarcoma, which shows reverse pattern - central density). Treatment is excision only after maturation.

24. Carrying Angle

The angle formed between the long axis of the humerus and the long axis of the ulna when the elbow is fully extended and the forearm is supinated. Normal values: 5-10° in males, 10-15° in females. This valgus angle is due to the asymmetric trochlea (medial lip extends more distally). Cubitus valgus increases this angle; cubitus varus decreases it. Important for assessing elbow alignment after fractures.

25. Cubitus Valgus & Cubitus Varus

  • Cubitus Valgus: Increased carrying angle (>15°), usually following lateral condyle fracture with non-union. Causes tardy ulnar nerve palsy (delayed ulnar nerve stretching over the medial epicondyle).
  • Cubitus Varus: Decreased carrying angle (gunstock deformity), most commonly a cosmetic complication of malunited supracondylar fracture. Does NOT cause tardy ulnar nerve palsy as commonly as valgus does.

26. Tennis Elbow (Lateral Epicondylitis)

Degenerative tendinopathy of the common extensor origin (primarily extensor carpi radialis brevis - ECRB) at the lateral epicondyle of the humerus. Caused by repetitive wrist extension and supination. Presents with pain and tenderness at the lateral epicondyle, worsened by resisted wrist extension (Cozen's test) and passive wrist flexion (Mill's test). Conservative treatment (physiotherapy, bracing, steroid injection) is effective in most cases.

27. Golfer's Elbow (Medial Epicondylitis)

Degenerative tendinopathy of the common flexor origin (pronator teres and flexor carpi radialis) at the medial epicondyle. Caused by repetitive wrist flexion and pronation. Presents with medial epicondyle pain worsened by resisted wrist flexion and pronation. Less common than tennis elbow. Must be differentiated from ulnar nerve entrapment (cubital tunnel syndrome), which may coexist in about 20% of cases.

28. Miner's Elbow (Olecranon Bursitis)

Inflammation of the olecranon bursa (between olecranon process and skin) from repeated pressure or trauma, traditionally seen in miners who kneel and lean on their elbows. The bursa becomes swollen with fluid but the elbow joint itself moves painlessly (unlike septic arthritis). Can also be caused by gout or septic bursitis. Treatment: aspiration, padding, and antibiotics if infected.

29. Anastomosis Around the Elbow

A rich arterial anastomotic network around the elbow ensures collateral circulation if the brachial artery is ligated above/below the elbow. Key contributors: superior and inferior ulnar collateral arteries (from brachial artery) anastomose with anterior and posterior ulnar recurrent arteries; radial and middle collateral arteries anastomose with radial and interosseous recurrent arteries. This is clinically significant as it allows safe ligation of the brachial artery in certain circumstances.

30. Vincula Longa & Vincula Brevia

Small triangular mesotenon folds that carry blood supply (from digital arteries) to the flexor tendons within the fibrous flexor sheath. The vinculum longum (long) supplies the FDS at mid-proximal phalanx and FDP at mid-middle phalanx. The vinculum breve (short) supplies the FDS at middle phalanx and FDP just proximal to its insertion on distal phalanx. Disruption during tendon surgery must be minimized to preserve blood supply.

31. Colles' Fracture

Fracture of the distal radius within 2.5 cm of the wrist joint, with dorsal displacement and dorsal angulation of the distal fragment. Caused by a fall on an outstretched hand (FOOSH) in elderly osteoporotic women. Produces the classic "dinner fork deformity." Associated injuries: ulnar styloid fracture (50%), median nerve compression. Treatment: closed reduction and cast (most cases) or surgical fixation for unstable fractures.

32. Smith's Fracture (Reverse Colles')

Fracture of the distal radius with volar (palmar) displacement and volar angulation of the distal fragment - the opposite of Colles'. Caused by a fall on the back of the outstretched hand or direct blow. Produces a "garden spade" deformity (volar prominence at wrist). More likely to be unstable than Colles', often requiring surgical fixation with a volar plate.

33. Dinner Fork Deformity

The characteristic deformity of a Colles' fracture: when viewed from the side, the wrist and hand show a step-like profile resembling the shape of a dinner fork or bayonet. The distal radius is displaced dorsally and radially, with dorsal tilt. The radial styloid is higher than normal. There is also radial deviation of the hand and prominence of the ulnar head (piano key sign if distal radioulnar joint is disrupted).

34. Median Cubital Vein

The most prominent and commonly used superficial vein for venepuncture, situated in the cubital fossa. It connects the cephalic vein (laterally) and the basilic vein (medially). The bicipital aponeurosis (lacertus fibrosus) separates it from the underlying brachial artery, providing protection during venepuncture. Its consistent position and large caliber make it the preferred site for IV access and blood sampling.

35. Bicipital Aponeurosis (Lacertus Fibrosus)

A flat, fibrous expansion arising from the distal biceps tendon that fans out medially to blend with the deep fascia of the forearm. It protects the brachial artery and median nerve from needle injury during cubital fossa venepuncture. It also reinforces the biceps tendon insertion and contributes to forearm flexion. During biceps tendon rupture, if the aponeurosis is intact, the biceps may still function partially.

36. Bennett's Fracture

Intra-articular fracture-dislocation of the base of the first metacarpal (thumb). A small triangular fragment at the ulnar base of the metacarpal remains held by the anterior oblique ligament (beak ligament), while the rest of the metacarpal is pulled proximally and radially by abductor pollicis longus. This is an unstable fracture requiring percutaneous K-wire fixation or open reduction. Rolando's fracture is the comminuted variant.

37. Monteggia's Fracture

Fracture of the proximal third of the ulna shaft combined with dislocation of the radial head at the radiocapitellar joint. The Bado classification describes 4 types based on direction of radial head dislocation. The radial nerve (posterior interosseous nerve) can be injured at the radial neck. In children, a greenstick ulna fracture with radial head dislocation is common. Treatment requires reduction of radial head and fixation of ulna fracture.

38. Galeazzi's Fracture

Fracture of the distal third of the radius shaft combined with dislocation/disruption of the distal radioulnar joint (DRUJ). Opposite of Monteggia's. The ulnar head is displaced dorsally (most commonly). It is called a "fracture of necessity" - the unstable DRUJ means surgery is always required (volar plate fixation of radius and repair/K-wiring of DRUJ). The anterior interosseous nerve can be injured.

39. Allen's Test

A clinical test to assess the adequacy of collateral circulation to the hand from the ulnar artery before radial artery cannulation or harvesting. The examiner occludes both radial and ulnar arteries while the patient clenches the fist (to exsanguinate), then releases the ulnar artery - the hand should flush pink within 5-7 seconds (normal test). A modified Allen's test is routinely done before arterial line insertion or CABG (radial artery harvest).

40. Carpal Tunnel Syndrome

The most common nerve entrapment syndrome - compression of the median nerve within the carpal tunnel (beneath the flexor retinaculum). Causes: idiopathic, pregnancy, hypothyroidism, rheumatoid arthritis, acromegaly. Features: wasting of thenar muscles, sensory loss over lateral 3½ fingers, nocturnal paresthesia. Positive Tinel's sign (tapping wrist) and Phalen's test (wrist flexion 60 sec). Treatment: splinting, steroid injection, or carpal tunnel decompression.

41. Ape Thumb Deformity (Simian Hand)

Flattening of the thenar eminence due to wasting of thenar muscles (abductor pollicis brevis, opponens pollicis, superficial head of flexor pollicis brevis), all supplied by the median nerve. The thumb lies in the same plane as the fingers (like an ape's hand) because opposition is lost. Caused by carpal tunnel syndrome or other median nerve injuries at the wrist. The index finger pointing deformity may also occur.

42. Pointing Index Deformity

When a patient with median nerve injury at the elbow tries to make a fist, the index (and middle) finger fails to flex - they remain extended and "pointing." This is because FDP to index and middle fingers (supplied by median nerve via anterior interosseous nerve) is paralyzed. In contrast, ring and little fingers flex (supplied by ulnar nerve). Opposite to the pattern seen in ulnar nerve injuries.

43. Claw Hand - Partial & Complete

Hyperextension of MCPJs and flexion of IPJs due to loss of intrinsic muscle function (lumbricals and interossei).
  • Partial (incomplete) claw: Only ring and little fingers (ulnar nerve injury at wrist - intrinsics to all fingers lost but FDP to ring/little is intact, causing claw pattern there).
  • Complete claw: All four fingers clawed (combined median + ulnar nerve injury, or ulnar nerve injury at elbow where FDP to ring/little is also paralyzed - paradoxically less clawing due to loss of FDP power = Ulnar Paradox).

44. Ulnar Paradox

When the ulnar nerve is injured at the wrist, clawing of ring and little fingers is more pronounced than when the injury is at the elbow. At the elbow level, FDP to ring and little fingers is also paralyzed, reducing the flexion force at IPJs, thus reducing the degree of clawing. Paradoxically, a higher (more proximal) injury causes less deformity than a lower (distal) injury - this is the "ulnar paradox."

45. Wrist Drop & Finger Drop

  • Wrist drop: Inability to extend the wrist, caused by radial nerve palsy (injury at spiral groove or above). The hand hangs limp at the wrist.
  • Finger drop: Inability to extend the fingers at MCPJs, caused by posterior interosseous nerve (deep branch of radial nerve) palsy. Extension at IPJs is preserved (via intrinsics). Both often occur together in radial nerve injuries. Patients cannot grip effectively because finger and wrist extension is needed to stabilize for power grip.

46. Trigger Finger (Stenosing Tenosynovitis)

The flexor tendon develops a nodular thickening (or the A1 pulley stenoses) preventing smooth gliding, causing the finger to "catch" or "snap" during flexion-extension. Most common in the ring finger. The finger may lock in flexion. Caused by repetitive gripping, diabetes, rheumatoid arthritis. Treatment: steroid injection into the tendon sheath, or surgical release of the A1 pulley. In children (congenital trigger thumb), spontaneous resolution is common.

47. Mallet Finger

Forced passive flexion of the distal phalanx while the extensor tendon is contracting tears the terminal extensor tendon at its insertion on the distal phalanx (or avulses a bony fragment). The distal phalanx droops (cannot be actively extended) while the PIP joint may hyperextend (swan neck deformity may develop). Common in ball sports (cricket, basketball). Treatment: dorsal splint of DIP in extension for 6-8 weeks continuously.

48. Anatomical Snuff Box

A triangular hollow on the radial aspect of the wrist at its dorsum, visible when the thumb is extended/abducted. Boundaries: laterally - tendons of APL and EPB; medially - tendon of EPL; floor - scaphoid, trapezium, and radial styloid. Contents: radial artery (crosses the floor), superficial branch of radial nerve. Tenderness in the snuff box after a FOOSH injury strongly suggests scaphoid fracture until proven otherwise.

49. Fracture of Scaphoid

The most common carpal bone fracture, usually from a FOOSH in young adults. Fracture most commonly occurs at the waist of the scaphoid. The proximal pole has a retrograde blood supply (distal to proximal), so waist/proximal pole fractures risk avascular necrosis of the proximal fragment. Clinically: snuff box tenderness, pain with axial loading of thumb. X-rays may be normal initially - CT/MRI confirms diagnosis. Treatment: cast for undisplaced waist fractures; surgical fixation for displaced or proximal pole fractures.

50. Whitlow or Felon

  • Whitlow (Herpetic whitlow): Viral infection of the finger pulp or periungual region caused by Herpes Simplex Virus (HSV-1 or HSV-2). Small vesicles on an erythematous base. Treated conservatively with antivirals; incision and drainage is CONTRAINDICATED.
  • Felon: Bacterial infection of the finger pulp (closed fibrous compartment). Intense throbbing pain, tense swelling of the pulp. Staphylococcus aureus is the most common organism. Requires urgent surgical decompression (drainage incision) to prevent pressure necrosis of the bone (osteomyelitis of distal phalanx).

51. Raynaud's Phenomenon

Episodic vasospasm of digital arteries causing the classic tricolor change: white (ischemia) → blue (cyanosis) → red (reactive hyperemia) in response to cold or emotional stress. Primary Raynaud's (disease) is idiopathic. Secondary Raynaud's (phenomenon) is associated with connective tissue diseases (scleroderma most commonly), cervical rib, vibration injury, drugs (ergotamine, beta-blockers). Treatment: cold avoidance, calcium channel blockers (nifedipine), sympathectomy in severe cases.

52. Boutonnière Deformity & Swan Neck Deformity

  • Boutonnière (Buttonhole) deformity: Rupture of the central slip of the extensor tendon at the PIP joint → PIP flexion + DIP hyperextension. The lateral bands slip volar to the PIP joint axis, acting as flexors. Seen in rheumatoid arthritis and finger injuries.
  • Swan Neck deformity: PIP hyperextension + DIP flexion. Caused by laxity of volar plate at PIP joint, intrinsic muscle tightness, or FDS rupture. Also seen in rheumatoid arthritis. Both deformities cause significant functional impairment.

53. Cephalic Vein

A superficial vein of the upper limb that runs along the lateral (radial) side of the forearm, crosses the cubital fossa, and runs in the deltopectoral groove between deltoid and pectoralis major to drain into the axillary vein. It is the vein most commonly used for creating arteriovenous fistulas (Brescia-Cimino fistula) for hemodialysis. It is also harvested as a conduit in CABG surgery.

54. Ulnar & Radial Bursa

Two synovial bursae in the palm and wrist that enclose the flexor tendons:
  • Radial bursa: Encloses the flexor pollicis longus tendon, extending from the wrist to the distal phalanx of the thumb.
  • Ulnar bursa: Encloses the tendons of FDS and FDP for all four fingers, extending from the wrist to the little finger distally (and ending as blind pouches for index, middle, and ring finger tendons at the palm). They communicate in 50% of people. Infection can spread between them ("horseshoe abscess").
These 54 topics cover the core upper limb anatomy and surgical conditions typically examined in MBBS/MS surgery and anatomy examinations. Let me know if you'd like any specific topic explained in greater depth or with diagrams!
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