• The lateral meniscus is nearly circular (not semilunar), is NOT attached to the fibular collateral ligament, and is LESS commonly injured than the medial meniscus. Its posterior horn gives attachment to the meniscofemoral ligament (of Humphry/Wrisberg).

• Internal haemorrhoids result from engorgement of the internal rectal venous plexus, which drains via the superior rectal vein → inferior mesenteric vein → portal system.

• The tendo Achilles (calcaneal tendon) inserts into the posterior surface of the calcaneus.

• The nerve to quadratus femoris (L4, L5, S1) innervates both gemellus inferior and quadratus femoris. (Gemellus superior is innervated by the nerve to obturator internus.)

• The boundaries of the epiploic foramen (of Winslow): Superior = caudate process of liver, Inferior = first part of duodenum, Anterior = free edge of lesser omentum (hepatoduodenal ligament), Posterior = IVC.

• The 1st CMC joint (thumb) is a classic saddle (sellar) joint, allowing flexion/extension and abduction/adduction.

• The elongated endothelial cells lining splenic sinusoids are called stave cells (or barrel stave cells). They have a distinctive rod-like arrangement.

• The nutrient artery to the tibia is the largest nutrient artery in the body and arises from the popliteal artery (or its posterior tibial branch - some sources say posterior tibial, but the standard teaching is popliteal artery).

Note: Most standard anatomy texts (Gray's, B.D. Chaurasia) state the nutrient artery of tibia arises from the posterior tibial artery. Answer: D) Posterior tibial artery is more widely accepted.

• The left ovarian vein drains into the left renal vein (unlike the right ovarian vein which drains directly into the IVC).

• The first part of the duodenum has a relatively poor blood supply as it is supplied by end arteries, making it more susceptible to ischemia and ulceration.

• Retrocaecal is the most common position (~65-75% of cases).

• The pre-allantoic hindgut gives rise to: descending colon, sigmoid colon, rectum, and upper anal canal. The distal 1/3 of transverse colon is derived from the midgut, not hindgut.

• Erb's palsy (C5, C6) causes: adduction of shoulder, medial rotation, extension of elbow, and pronation of forearm (waiter's tip posture). Supination is LOST (not present), so this is the exception asked.

• The sciatic nerve passes through the gluteal region. IM injection injury in this area causes pain/paresthesia along its entire distribution - posterior thigh, posterolateral leg, and foot.

• The base (posterior surface) of the urinary bladder in males is related to: the vas deferens, seminal vesicles, and rectum. The vas deferens runs along the base of the bladder.

• The femoral sheath contains: femoral artery (lateral compartment), femoral vein (middle compartment), and femoral canal with lymphatics (medial compartment). The femoral nerve is NOT inside the sheath. The femoral branch of the genitofemoral nerve runs within the femoral sheath.

• The external oblique aponeurosis forms the superficial inguinal ring, the inguinal ligament, and the lacunar ligament. The conjoint tendon is formed by internal oblique + transversus abdominis.

• The glans penis drains to deep inguinal lymph nodes (and internal iliac nodes), while the skin of the penile shaft drains to superficial inguinal nodes.

Correct intended answer: D) Popliteal vein - The femoral vein becomes the popliteal vein after passing through the adductor hiatus. The adductor canal contains femoral vessels and saphenous nerve. Among given options, none perfectly fits except by convention exams often pick D.

• The nucleus pulposus of the intervertebral disc is the remnant of the embryonic notochord.

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