musculature of leg and dorsum of foot Flashcards
muscles of anterior crural compartment and dorsum of the foot? 5
tibialis anterior
extensor digitorum longus
flbularis tertius
extensor hallucis longus
extensor digitorum brevis
lateral crural ligaments?
fibularis longus
fibularis brevis
attachments of tibialis anterior? 2 insertions !!
origin: lateral surface of most of tibia and interosseous membrane
insertion: medial cuneiform and base of first metatarsal
talus has how many articulating surfaces?
3
fibula
tibia
navicular
action of tibialis anterior?
dorsiflex and invert foot
POWERFUL INVERTER OF FOOT**
attachments of extensor digitorum longus?
origin:most of anterior surface of fibula and interosseous membrane
insertion:
middle and distal phalanges of four lesser digits
innervation of tibialis anterior?
deep fibular nerve
action of extensor digitorum longus?
extens toes, dorsiflexes foot**has fibular tertius
sustentaculum
on calcaneus
maintains talus superiorly by acting as a shelf for body of talus
allows for arch
how many compartments in leg?
4
anterior and posterior intermuscular septa
transverse intermuscular septa
innervation of extensor digitorum longus?
deep fibular nerve
lateral retinaculum?
superior fibular and inferior fibular
over everters
flexor retinaculum?
medial side of foot
for flexors
muscles of anterior crural compartment?
tibialis anterior
extensor digitorum longus
extensor hallucis longus
fibularis tertius
attachment of fibularis tertius
origin:distal anterior surface of fibula (continuation of extensor digitorum longus
)insertion:base of 5th metatarsal
extensor retinaculum?
super and inferior-over extensors of foot
action of fibularis tertius
aids in eversion and dorsiflexion
innervation of fibularis tertius?
deep fibular nerve
attachments of extensor hallucis longus?
origin:mid-portion of fibula, deep to tibialis anterior and extensor digitoruminsertion:base of distal phalanx of great toe (Hallux)
action of extensor hallucis longus?
extends great toe, dorsiflexes foot
attachment of extensor digitorum brevis?
- *only muscle on dorsum of foot
- has extensor hallucis brevis component
origin:dorsal surface of calcaneusinsertion:base of proximal phalanx of great toe and proximal phalanges of toes 2,3 and 4 which attach in concert with tendons of extensor digitorum longus
innervation of extensor hallucis longus?
deep fibular nerve
action of extensor digitorum brevis?
extend toes 1,2,3,4
muscles of lateral crural compartments
everters
flbularis longus
fibularis brevis
attachment of fibularis longus?
origin:upper lateral two thirds of fibula
insertion:first metatarsal and medial cuneiform (goes on the bottom side of the foot)
BIFURCATES at the base of the first metatarsal and medial cuneiform
innervation of extensor digitorum brevis?
deep fibular nerve
action of fibularis longus?
everts and plantar flexes foot
attachments of fibularis brevis
origin: distal lateral fibula
insertion: base of fifth metatarsal
innervation of fibularis longus?
superficial fibular nerve
action of fibularis brevis
everts and plantar flexes the foot
muscles of posterior crural compartment? superficial 3
deep 4
superficial layer:gastrocnemius
soleus
plantaris
deep layer:popliteus
flexor digitorum longus
flexor hallucis longus
tibialis posterior
attachments of gastrocnemius
origin: posterior surfaces of roughened area of lateral and medial femoral condyles
insertion: calcaneus in common with soleus and plantaris muscles
action of gastrocnemius (remember it crosses two joints)
plantar flexes foot, flexes leg
used in every running step
innervation of fibular brevis
superficial fibular nerve
triceps serae?
gastrocnemius
soleus
plantaris
attachments of soleus
origin: posterior surface of head and proximal shaft of fibula, soleal line on upper portion of tibia
insertion: calcaneus with grastrocnemius and plantaris muscle
MUTLIPENATE
action of soleus? DOES NOT cross two joints
plantar flexes foot
more for jumping
innervation of gastrocnemius
tibial nerve
attachments of the plantaris?
origin: posterior surface of lateral femoral condyle
insertion: calcaneus with gastrocnemius and soleus
innervation of soleus?
tibial nerve
action of plantaris?
weakly plantar flex foot and flex leg
innervation of plantaris?
tibial nerve
action of popliteus?
flexes and medially rotates leg
when foot is fixed, laterally rotates femur to unlock knee joint as leg flexion proceeds
attachments of popliteus?
origin:lateral surface of lateral condyle of femurinsertion:proximal tibia above soleal line
achilles tendons
triceps serae
gastrocnemius
plantaris
soleus
attachments of flexor digitorum longus?
origin:posterior surface, mid portion of tibia
insertion:base of distal phalanx of four small toes
BIPENATE
innervation of popliteus?
tibial nerve
action of flexor digitorum longus?
flexes four small toes, plantar flexes foot
attachments of tibialis posterior?
origin: posterior surface of upper portion of tibia, fibula and intervening interosseous membrane
insertion: plantar surface of metatarsals 2,3,4, navicular, medial cuneiform mainly, but also to ALL other tarsals except talus
BIPENATE
innervation of flexor digitorum longus?
tibial nerve
action of tibialis posterior?
inverts and plantar flexes foot
tendons behind medial malleolus?
behind the medial malleolus anteromedial to posterolateral–> Tom, Dick, and Harry-
innervation of tibialis posterior?
tibial nerve
order of the muscle bellies in the superior portion
Dick, Tom and Harry
Flexor hallucis longus
origin–> distal two thirds of posterior surface of fibula and adjacent interosseous membrane
insertion
base of distal phalanx of great toe
action of hallucis longus
flexes great toes
plantar flexes foot
innervation hallucis longus
tibial nerv e
