Hi I want you to list out the muscles of leg and give their origin, insertion, innervation, action , nerve root , blood supply Organize them into respective compartments and as thigh and leg
| Muscle | Origin | Insertion | Action | Nerve | Nerve Root | Blood Supply |
|---|---|---|---|---|---|---|
| Iliopsoas (Iliacus + Psoas Major) | Iliacus: iliac fossa; Psoas: T12-L5 vertebral bodies & transverse processes | Lesser trochanter of femur | Flexion of hip; Psoas also laterally flexes vertebral column | Femoral nerve (Iliacus); Branches of L1-L3 directly (Psoas) | L1, L2, L3 | Iliolumbar artery; medial circumflex femoral a. |
| Sartorius | Anterior superior iliac spine (ASIS) | Medial surface of proximal tibia (pes anserinus) | Flexes, abducts, and laterally rotates thigh; flexes and medially rotates leg at knee | Femoral nerve | L2, L3 | Femoral artery branches |
| Rectus Femoris | Anterior inferior iliac spine (AIIS); reflected head from acetabular rim | Tibial tuberosity (via patellar tendon) | Extends knee; flexes hip | Femoral nerve | L2, L3, L4 | Lateral circumflex femoral artery (descending branch) |
| Vastus Lateralis | Greater trochanter; lateral lip of linea aspera | Tibial tuberosity (via patellar tendon) | Extends knee | Femoral nerve | L2, L3, L4 | Lateral circumflex femoral artery |
| Vastus Medialis | Medial lip of linea aspera; intertrochanteric line | Tibial tuberosity (via patellar tendon) | Extends knee; last 15° of extension (VMO) | Femoral nerve | L2, L3, L4 | Femoral artery |
| Vastus Intermedius | Anterior and lateral surfaces of femoral shaft | Tibial tuberosity (via patellar tendon) | Extends knee | Femoral nerve | L2, L3, L4 | Lateral circumflex femoral artery |
| Pectineus | Pectineal line of pubis | Pectineal line of femur (below lesser trochanter) | Adducts and flexes thigh | Femoral nerve (+ sometimes obturator nerve) | L2, L3 | Medial circumflex femoral artery |
| Muscle | Origin | Insertion | Action | Nerve | Nerve Root | Blood Supply |
|---|---|---|---|---|---|---|
| Adductor Longus | Body of pubis (below pubic crest) | Middle 1/3 of linea aspera | Adducts thigh; assists flexion | Obturator nerve (anterior division) | L2, L3, L4 | Deep femoral artery (profunda femoris) |
| Adductor Brevis | Body and inferior ramus of pubis | Pectineal line; upper linea aspera | Adducts thigh; assists flexion | Obturator nerve (anterior division) | L2, L3 | Medial circumflex femoral; obturator artery |
| Adductor Magnus | Inferior ramus of pubis + ramus of ischium (adductor part); ischial tuberosity (hamstring part) | Linea aspera; medial supracondylar ridge; adductor tubercle | Adducts thigh; adductor part flexes; hamstring part extends | Obturator nerve (adductor part); Sciatic nerve - tibial division (hamstring part) | L2, L3, L4 | Perforating branches of profunda femoris |
| Gracilis | Body and inferior ramus of pubis | Medial surface of proximal tibia (pes anserinus) | Adducts thigh; flexes and medially rotates leg | Obturator nerve (anterior division) | L2, L3 | Medial circumflex femoral; obturator artery |
| Obturator Externus | Margins of obturator foramen; obturator membrane | Trochanteric fossa of femur | Laterally rotates thigh | Obturator nerve (posterior division) | L3, L4 | Obturator artery; medial circumflex femoral |
| Muscle | Origin | Insertion | Action | Nerve | Nerve Root | Blood Supply |
|---|---|---|---|---|---|---|
| Biceps Femoris (Long head) | Ischial tuberosity (common head with semitendinosus) | Head of fibula | Extends hip; flexes knee; laterally rotates leg when knee flexed | Tibial division of sciatic nerve | L5, S1, S2 | Perforating branches of profunda femoris |
| Biceps Femoris (Short head) | Lateral lip of linea aspera; lateral supracondylar ridge | Head of fibula | Flexes knee; laterally rotates leg | Common fibular (peroneal) division of sciatic nerve | L5, S1 | Perforating branches of profunda femoris |
| Semitendinosus | Ischial tuberosity (common head) | Medial surface of proximal tibia (pes anserinus) | Extends hip; flexes knee; medially rotates leg | Tibial division of sciatic nerve | L5, S1, S2 | Perforating branches of profunda femoris |
| Semimembranosus | Ischial tuberosity (separate, lateral facet) | Posterior aspect of medial tibial condyle; also forms oblique popliteal ligament | Extends hip; flexes knee; medially rotates leg | Tibial division of sciatic nerve | L5, S1, S2 | Perforating branches of profunda femoris |
Note: The "unhappy triad" of hamstrings - remember "two semis + biceps". Long head of biceps femoris shares the tibial nerve but the short head is the only hamstring innervated by the common peroneal nerve.
| Muscle | Origin | Insertion | Action | Nerve | Nerve Root | Blood Supply |
|---|---|---|---|---|---|---|
| Tibialis Anterior | Lateral condyle and proximal 2/3 of lateral tibial shaft; interosseous membrane | Medial cuneiform; base of 1st metatarsal | Dorsiflexion; inversion of foot | Deep fibular (peroneal) nerve | L4, L5 | Anterior tibial artery |
| Extensor Hallucis Longus | Middle 1/2 of medial fibular surface; interosseous membrane | Dorsal surface of distal phalanx of great toe | Extends great toe; dorsiflexes foot; assists inversion | Deep fibular (peroneal) nerve | L4, L5 | Anterior tibial artery |
| Extensor Digitorum Longus | Lateral condyle of tibia; proximal 3/4 of anterior fibula; interosseous membrane | Dorsal digital expansions of lateral 4 toes | Extends lateral 4 toes; dorsiflexes and everts foot | Deep fibular (peroneal) nerve | L4, L5, S1 | Anterior tibial artery |
| Fibularis (Peroneus) Tertius | Distal 1/3 of anterior fibula | Dorsum of 5th metatarsal base | Dorsiflexes and everts foot | Deep fibular (peroneal) nerve | L4, L5, S1 | Anterior tibial artery |
| Muscle | Origin | Insertion | Action | Nerve | Nerve Root | Blood Supply |
|---|---|---|---|---|---|---|
| Fibularis (Peroneus) Longus | Head and proximal 2/3 of lateral fibula | Medial cuneiform; base of 1st metatarsal (runs under foot) | Everts foot; plantarflexes; supports transverse arch | Superficial fibular (peroneal) nerve | L5, S1 | Fibular (peroneal) artery |
| Fibularis (Peroneus) Brevis | Distal 2/3 of lateral fibula | Styloid process (tuberosity) at base of 5th metatarsal | Everts foot; plantarflexes | Superficial fibular (peroneal) nerve | L5, S1 | Fibular (peroneal) artery |
| Muscle | Origin | Insertion | Action | Nerve | Nerve Root | Blood Supply |
|---|---|---|---|---|---|---|
| Gastrocnemius (Medial head) | Posterior surface of medial femoral condyle | Calcaneus via calcaneal (Achilles) tendon | Plantarflexes foot; flexes knee | Tibial nerve | S1, S2 | Sural arteries (from popliteal artery) |
| Gastrocnemius (Lateral head) | Posterior surface of lateral femoral condyle | Calcaneus via calcaneal (Achilles) tendon | Plantarflexes foot; flexes knee | Tibial nerve | S1, S2 | Sural arteries |
| Soleus | Posterior head and neck of fibula; soleal line of tibia | Calcaneus via calcaneal (Achilles) tendon | Plantarflexes foot (most powerful; acts when knee is flexed) | Tibial nerve | S1, S2 | Posterior tibial and fibular arteries |
| Plantaris | Lateral supracondylar ridge of femur | Calcaneus (medial side of Achilles tendon) | Weak plantarflexion; vestigial | Tibial nerve | S1, S2 | Sural arteries |
Triceps Surae = Gastrocnemius + Soleus (share Achilles tendon). Plantaris has a long thin tendon used in tendon grafts.
| Muscle | Origin | Insertion | Action | Nerve | Nerve Root | Blood Supply |
|---|---|---|---|---|---|---|
| Popliteus | Lateral femoral condyle; arcuate popliteal ligament | Posterior surface of proximal tibia (above soleal line) | "Unlocks" knee from full extension by medially rotating tibia; flexes knee | Tibial nerve | L4, L5, S1 | Popliteal artery; posterior tibial artery |
| Flexor Hallucis Longus | Posterior surface of fibula (lower 2/3); interosseous membrane | Plantar surface of distal phalanx of great toe | Flexes great toe; plantarflexes and inverts foot | Tibial nerve | S2, S3 | Fibular (peroneal) artery |
| Flexor Digitorum Longus | Posterior surface of tibia (medial to tibialis posterior) | Plantar surface of distal phalanges of lateral 4 toes | Flexes lateral 4 toes; plantarflexes and inverts foot | Tibial nerve | S2, S3 | Posterior tibial artery |
| Tibialis Posterior | Posterior surface of interosseous membrane; adjacent tibia and fibula | Navicular tuberosity; cuneiforms; cuboid; bases of 2nd-4th metatarsals | Plantarflexes; inverts foot; supports medial longitudinal arch | Tibial nerve | L4, L5 | Posterior tibial artery; fibular artery |
| Nerve | Compartment(s) | Key Roots |
|---|---|---|
| Femoral nerve | Anterior thigh | L2, L3, L4 |
| Obturator nerve | Medial thigh | L2, L3, L4 |
| Sciatic - Tibial division | Posterior thigh + all posterior leg | L4, L5, S1, S2 |
| Sciatic - Common fibular division | Biceps femoris (short head) | L5, S1 |
| Deep fibular nerve | Anterior leg | L4, L5 |
| Superficial fibular nerve | Lateral leg | L5, S1 |
| Tibial nerve | Posterior leg (superficial + deep) | L4-S3 |
| Compartment | Primary Artery |
|---|---|
| Anterior thigh | Femoral artery / Lateral circumflex femoral |
| Medial thigh | Obturator artery / Profunda femoris (perforators) |
| Posterior thigh | Perforating branches of profunda femoris |
| Anterior leg | Anterior tibial artery |
| Lateral leg | Fibular (peroneal) artery |
| Posterior leg (superficial) | Popliteal / Sural arteries |
| Posterior leg (deep) | Posterior tibial artery; Fibular artery |
Clinical tip: The pes anserinus ("goose's foot") is the common insertion of Sartorius, Gracilis, and Semitendinosus on the medial tibia - remember by "SGT" (Sartorius, Gracilis, Semitendinosus) or "Say Grace before Tea."
Also can you now do the same for ankle and foot
| Muscle | Origin | Insertion | Action | Nerve | Nerve Root | Blood Supply |
|---|---|---|---|---|---|---|
| Extensor Digitorum Brevis (EDB) | Superolateral surface of calcaneus (sinus tarsi) | Dorsal digital expansions of toes 2-4 (joins EDL tendons) | Extends toes 2-4 at MTP joints | Deep fibular (peroneal) nerve | L5, S1 | Dorsalis pedis artery (dorsal metatarsal branches) |
| Extensor Hallucis Brevis (EHB) | Superolateral surface of calcaneus (medial part; often considered medial belly of EDB) | Dorsal surface of base of proximal phalanx of great toe | Extends great toe at MTP joint | Deep fibular (peroneal) nerve | L5, S1 | Dorsalis pedis artery |
Note: EHB is often described as the medial belly of EDB. The deep fibular nerve and dorsalis pedis artery pass between EDB and the dorsum of the foot - this is a landmark for surgical approaches.
| Muscle | Origin | Insertion | Action | Nerve | Nerve Root | Blood Supply |
|---|---|---|---|---|---|---|
| Abductor Hallucis | Medial process of calcaneal tuberosity; flexor retinaculum; plantar aponeurosis | Medial side of base of proximal phalanx of great toe | Abducts and flexes great toe at MTP; supports medial arch | Medial plantar nerve | S1, S2 | Medial plantar artery |
| Flexor Digitorum Brevis (FDB) | Medial process of calcaneal tuberosity; plantar aponeurosis | Middle phalanges of toes 2-5 (splits to allow FDL to pass through - "perforated flexor") | Flexes toes 2-5 at PIP joints; supports longitudinal arch | Medial plantar nerve | S1, S2 | Medial plantar artery |
| Abductor Digiti Minimi | Medial and lateral processes of calcaneal tuberosity; plantar aponeurosis | Lateral side of base of proximal phalanx of 5th toe | Abducts 5th toe; flexes 5th toe at MTP | Lateral plantar nerve | S1, S2 | Lateral plantar artery |
Memory: Layer 1 = "A-F-A" (Abductor Hallucis, Flexor Digitorum Brevis, Abductor Digiti Minimi)
| Muscle | Origin | Insertion | Action | Nerve | Nerve Root | Blood Supply |
|---|---|---|---|---|---|---|
| Quadratus Plantae (Flexor Accessorius) | Two heads: medial head from medial plantar surface of calcaneus; lateral head from lateral plantar surface | Lateral border of FDL tendon (before it divides) | Corrects the medial pull of FDL; assists FDL in flexing toes | Lateral plantar nerve | S1, S2 | Lateral plantar artery |
| Lumbricals (4 muscles) | 1st: medial side of 1st FDL tendon; 2nd-4th: adjacent sides of FDL tendons | Medial sides of extensor digital expansions of toes 2-5 (dorsal digital expansion) | Flex MTP joints; extend IP joints of toes 2-5 (same action as hand lumbricals) | 1st lumbrical: Medial plantar nerve; 2nd-4th: Lateral plantar nerve | S2, S3 | Medial and lateral plantar arteries |
Layer 2 also contains: The tendons of FDL and FHL (extrinsic) passing through the sole.
| Muscle | Origin | Insertion | Action | Nerve | Nerve Root | Blood Supply |
|---|---|---|---|---|---|---|
| Flexor Hallucis Brevis (FHB) | Plantar surface of cuboid; lateral cuneiforms; plantar calcaneocuboid ligament | Two tendons: medial head to medial side of proximal phalanx of hallux (with Abductor Hallucis); lateral head to lateral side (with Adductor Hallucis). Both heads have sesamoid bones embedded. | Flexes great toe at MTP joint; supports medial arch | Medial plantar nerve | S1, S2 | Medial plantar artery |
| Adductor Hallucis | Oblique head: bases of metatarsals 2-4 and long plantar ligament; Transverse head: plantar MTP joint capsules of toes 3-5 | Lateral side of base of proximal phalanx of great toe (lateral head of FHB) | Adducts great toe; maintains transverse arch | Deep branch of lateral plantar nerve | S2, S3 | Lateral plantar artery |
| Flexor Digiti Minimi Brevis | Base of 5th metatarsal; long plantar ligament | Lateral side of base of proximal phalanx of 5th toe | Flexes 5th toe at MTP joint | Lateral plantar nerve (superficial branch) | S2, S3 | Lateral plantar artery |
Memory: Layer 3 = "FHB, AH, FDMB" - the short flexors and adductor of great toe + flexor of little toe.
| Muscle | Origin | Insertion | Action | Nerve | Nerve Root | Blood Supply |
|---|---|---|---|---|---|---|
| Plantar Interossei (3 muscles) | Medial sides of metatarsals 3, 4, and 5 (one head each) | Medial sides of bases of proximal phalanges of toes 3, 4, 5 + dorsal digital expansions | PAD - Plantar ADduct toes 3-5 toward 2nd toe (axis of foot is 2nd ray); flex MTP, extend IP joints | Deep branch of lateral plantar nerve | S2, S3 | Plantar metatarsal arteries (from lateral plantar artery) |
| Dorsal Interossei (4 muscles) | Adjacent sides of all metatarsals (bipennate, two heads each) | 1st: medial side of proximal phalanx of 2nd toe; 2nd-4th: lateral sides of proximal phalanges of toes 2, 3, 4 + dorsal digital expansions | DAB - Dorsal ABduct toes 2-4 away from 2nd toe; flex MTP, extend IP joints | Deep branch of lateral plantar nerve | S2, S3 | Dorsal metatarsal arteries; plantar metatarsal arteries |
Memory: DAB (Dorsal = ABduct) vs PAD (Plantar = ADduct). The foot axis runs along the 2nd ray (unlike the hand where it is the 3rd finger). Layer 4 also contains: Tendons of Tibialis Posterior and Fibularis Longus (extrinsic) deep here.
| Nerve | Muscles Supplied | Root |
|---|---|---|
| Deep fibular nerve | EDB, EHB (dorsal) | L5, S1 |
| Medial plantar nerve (like median nerve in hand) | Abductor Hallucis, FDB, FHB, 1st Lumbrical | S1, S2 |
| Lateral plantar nerve - Superficial branch (like ulnar nerve in hand) | Flexor Digiti Minimi Brevis; Plantar interossei; 4th lumbrical | S2, S3 |
| Lateral plantar nerve - Deep branch | Adductor Hallucis; Dorsal interossei; Lumbricals 2-4; Quadratus plantae | S2, S3 |
| Region | Artery |
|---|---|
| Dorsum of foot | Dorsalis pedis artery (continuation of anterior tibial artery) |
| Plantar medial structures | Medial plantar artery (branch of posterior tibial) |
| Plantar lateral structures | Lateral plantar artery (branch of posterior tibial) |
| Deep plantar arch | Deep plantar arch (lateral plantar artery anastomoses with deep plantar branch of dorsalis pedis) |
| Toes | Plantar digital arteries (from plantar arch); Dorsal digital arteries (from arcuate artery) |
| Layer | Contents | Nerve |
|---|---|---|
| Layer 1 (superficial) | Abductor Hallucis, FDB, Abductor Digiti Minimi | Medial plantar (FDB + Abductor Hallucis); Lateral plantar (Abductor Digiti Minimi) |
| Layer 2 | Quadratus Plantae, 4 Lumbricals (+ FDL & FHL tendons) | Lateral plantar (QP + L2-4); Medial plantar (L1) |
| Layer 3 | FHB, Adductor Hallucis, Flexor Digiti Minimi Brevis | Medial plantar (FHB); Lateral plantar deep branch (Adductor); Lateral plantar superficial (FDMB) |
| Layer 4 (deepest) | 3 Plantar interossei, 4 Dorsal interossei (+ Tib. Post. & Per. Longus tendons) | Lateral plantar deep branch |