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Muscles of the Foot

Muscles of the Foot. Abductor Hallucis. Origin: medial process of calcaneal tuberosity Insertion: base of proximal phalanx of hallux on medial side Innervation: medial plantar nerve (S2,3). Abductor Hallucis. Abductor Hallucis. Abductor Hallucis. Abductor Hallucis. Action:

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Muscles of the Foot

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  1. Muscles of the Foot

  2. Abductor Hallucis • Origin: • medial process of calcaneal tuberosity • Insertion: • base of proximal phalanx of hallux on medial side • Innervation: • medial plantar nerve (S2,3)

  3. Abductor Hallucis

  4. Abductor Hallucis

  5. Abductor Hallucis

  6. Abductor Hallucis • Action: • abduct hallux • flexion of hallux

  7. Flexor Digitorum Brevis • Origin: • medial process of calcaneal tuberosity, plantar aponeurosis, intermuscular septae • Insertion: • base of middle phalanx of digits 2-5 • Innervation: • medial plantar nerve (S2,3)

  8. Flexor Digitorum Brevis

  9. Flexor Digitorum Brevis

  10. Flexor Digitorum Brevis • Action: • flex digits 2-5

  11. Abductor Digiti Minimi • Origin: • calcaneal tuberosity • Insertion: • base of proximal phalanx of 5th digit on lateral side • Innervation: • lateral plantar nerve (S2,3)

  12. Abductor Digiti Minimi

  13. Abductor Digiti Minimi

  14. Abductor Digiti Minimi

  15. Abductor Digiti Minimi • Action: • abduct 5th toe • flexion of 5th toe

  16. Lumbricals • Origin: • tendons of flexor digitorum longus • Insertion: • proximal phalanx and medial side of extensor expansion of EDL of digits 2-5 • Innervation: • (1st) lumbrical: medial plantar nerve; • lateral three lumbricals: lateral plantar nerve (S2,3)

  17. Lumbricals

  18. Lumbricals • Actions: • Flex MTP joint • Extend PIP joint of digits 2-5

  19. Quadratus Plantae • Origin: • two heads from medial and lateral side of inferior aspect of calcaneus • Insertion: • tendons of flexor digitorum longus • Innervation: • lateral plantar nerve (S2,3)

  20. Quadratus Plantae

  21. Quadratus Plantae

  22. Quadratus Plantae • Actions: • assists flexor digitorum longus in flexing toes 2-5

  23. Flexor Hallucis Brevis • Origin: • cuboid and lateral cuneiform on plantar side • Insertion: • medial belly: medial side of proximal phalanx of hallux • lateral belly: lateral side of proximal phalanx • Innervation: • medial plantar nerve (S2,3)

  24. Flexor Hallucis Brevis

  25. Flexor Hallucis Brevis

  26. Flexor Hallucis Brevis • Action: • flex MTP joint of hallux

  27. Adductor Hallucis • Origin: • oblique head: base of metatarsals 2-4 • transverse head: head of metatarsals 3-5 • Insertion: • base of proximal phalanx of hallux on lateral side • Innervation: • lateral plantar nerve (S2,3)

  28. Adductor Hallucis-oblique

  29. Adductor Hallucis-oblique

  30. Adductor Hallucis-transverse

  31. Adductor Hallucis-transverse

  32. Adductor Hallucis • Actions: • adduct great toe toward midline of foot (i.e. 2nd digit) • flex hallux at MTP joint

  33. Flexor Digiti Minimi Brevis • Origin: • base of 5th metatarsal • Insertion: • base of proximal phalanx of 5th digit on lateral side • Innervation: • lateral plantar nerve (S2,3)

  34. Flexor Digiti Minimi Brevis

  35. Flexor Digiti Minimi Brevis

  36. Flexor Digiti Minimi Brevis • Action: • flex MTP joint of 5th toe

  37. Dorsal Interossei • Origin: • four muscles from the shafts of adjacent metatarsal bones • Insertion: • base of proximal phalanges for digit 2 (both sides) & digits 3,4 (lateral side) • Innervation: • lateral plantar nerve (S2,3)

  38. Dorsal Interossei

  39. Dorsal Interossei • Actions: • abduct digits 2-4 away from midline • flex MTP joints • extend IP joints of those digits

  40. Plantar Interossei • Origin: • base and medial plantar surface of metatarsals 3-5 • Insertion: • base and medial side of proximal phalanges and extensor expansions of digits 3-5 • Innervation: • lateral plantar nerve (S2,3)

  41. Plantar Interossei -origin

  42. Plantar Interossei • Actions: • adduct digits 3-5 • flex MTP • extend IP joints of digits 3-5

  43. Actions of the Foot, Ankle, Lower Leg

  44. Dorsiflexion -tibialis anterior -extensor digitorum longus -peroneus tertius -extensor hallucis longus

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