Comp. Vert Part IV

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Author:
hw.hair
ID:
284765
Filename:
Comp. Vert Part IV
Updated:
2014-10-03 18:34:34
Tags:
anatomy muscles
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anatomy
Description:
Muscles
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  1. Tibialis anterior: tibia- towards the front

    Action: prime mover of dorsal flexion; inverts foot
    • O: lateral condyle and upper 2/3 of tibial shaft; interosseus membrane 
    • I: by tendon into inferior surface of medial cuneiform and first metatarsal bone
  2. Extensor digitorum longus: increases angle at joint- toe -long

    Action: prime mover of toe extension; dorsiflexes foot
    • O: lateral condyle of tibia; proximal 3/4 of fibula; interosseus membrane 
    • I: middle and distal phalanges of toes 2-5
  3. Fibularis (peroneus) tertius: fibula- third

    Action: dorsiflexes and everts foot
    • O: distal anterior surface of fibula and interosseus membrane 
    • I: tendon inserts on dorsum of 5th metatarsal
  4. Extensor hallucis longus: increase angle at joint- great toe- long

    Action: extends great toe; dorsiflexes foot
    • O: anteromedial fibula shaft and interosseus membrane
    • I: tendon inserts on distal phalanx of great toe
  5. Fibularis (peroneus) longus: fibula- long

    Action: plantar flexes and everts foot
    • O: head and upper portion of lateral aspect of fibula
    • I: by long tendon that curves under foot to first metatarsal and medial cuneiform
  6. Fibularis (peroneus) brevis: fibula- short

    Action: plantar flexes and everts foot
    • O: distal fibula shaft
    • I: tendon inserts on proximal end of 5th metatarsal
  7. Gastrocnemius: belly- leg

    Action: plantar flexes foot when knee is extended; flexes knee when foot is dorsiflexed
    • O: by two heads from medial and lateral condyles of femur
    • I: posterior calcaneus via calcaneal tendon
  8. Soleus: fish

    Action: plantar flexes foot; important locomotor and postural muscle
    • O: extensive cone-shaped origin from superior tibia, fibula, and interosseus membrane 
    • I: posterior calcaneus via calcaneal tendon
  9. Plantaris: sole of foot

    Action: assists in knee flexion and plantar foot flexion
    • O: posterior femus above lateral condyle 
    • I: via a tendon into calcaneus or calcaneus tendon
  10. Popliteal: back of knee

    Action: flexes and rotates leg medially to unlock extended knee; rotates thigh laterally with tibia fixed
    • O: lateral condyle of femur and lateral meniscus
    • I: proximal tibia
  11. Flexor digitorum longus: decrease angle at joint- toe- long

    Action: plantar flexes and inverts foot; flexes toes; help foot "grip" ground
    • O: extensive origin on the posterior tibia
    • I: tendon runs behind medial malleolus and inserts into distal phalanges of toes 2-5
  12. Flexor hallucis longus: decrease angle at joints- great toe- long

    Action: plantar flexes and inverts foot; flexes great toe at all joints; "push off" muscles during walking
    • O: midshaft of fibula and interosseus membrane
    • I: tendon runs under foot to distal phalanx of great toe
  13. Tibialis posterior: tibia- towards the back

    Action: prime mover of foot inversion; plantar flexes foot
    • O: extensive origin from superior tibia and fibula and interosseus membrane 
    • I: tendon passes under arch of foot and inserts onto several tarsals and metatarsals 2-4
  14. Extensor digitorum brevis: increase angle at joints- toe- short

    Action: helps extend toes at metatarsophalangeal joints
    • O: anterior part of calcaneus bone; extensor retinaculum 
    • I: base of proximal phalanx of great toe; extensor expansions on toes 2-5
  15. Flexor digitorum brevis: decrease angle at joints- toe- short

    Action: helps flex toes
    • O: tuber calcanei
    • I: middle phalanx of toes 2-4
  16. Abductor hallucis: move away from midline- great toe

    Action: abducts great toe
    • O: tuber calcanei and flexor retinaculum
    • I: proximal phalanx of the medial side of great toe in the tendon of flexor hallucis brevis
  17. Abductor digiti minimi: moves away from midline- toe- small

    Action: abducts and flexes little toe
    • O: tuber calcanei
    • I: lateral side of base of little toe's proximal phalanx
  18. Lumbricals: 

    Action: flex toes at metatarsophalangeal joints
    • O: from each tendon of flexor digitorum longus
    • I: extensor expansion on proximal phalanx of toes 2-5 on the medial side
  19. Flexor hallucis brevis: decrease angle at joints- great toe- short

    Action: flexes metatarsophalangeal joint of big toe
    • O: lateral cuneiform and cuboid bones
    • I: via two tendons onto base of the proximal phalanx of great toe
  20. Adductor hallucis: move toward midline- great toe

    Action: helps maintain the transverse arch of foot; weak adductor of big toe
    • O: from bases of metatarsals 2-4 and from fibularis longus tendon sheath (oblique head); from ligament across metatarsophalangeal joints (transverse head)
    • I: base of proximal phalanx of great toe
  21. Flexor digiti minimi brevis: decreases angle at joints- toe- small- short

    Action: flexes little toe at metatarsophalangeal joint
    • O: base of metatarsal 5 and tendon sheath of fibularis longus
    • I: base of proximal phalanx of toe 5
  22. Flexor accessorius:

    Action: straightens out the oblique pull of flexor digitorum longus
    • O: medial and lateral sides of calcaneus
    • I: tendon  of flexor digitorum longus in midsole
  23. Plantar interossei: foot- between bones 

    Action: adductors of toes; pull toes towards digit 2
    • O: the side of each metatarsal that faces the midaxis of the foot (digit 2)
    • I: extensor expansion over first phalanx of toes 3-5
  24. Dorsal interossei: dorsal- between bones 

    Action: abduct toes
    • O: sides of metatarsals
    • I: extensor expansion over first phalanx of toes 3-5, on side opposite midaxis of foor (toe 2), but on both sides of toe 2

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