posterior leg and ankle Flashcards
what is the name of the line on the posterior surface of the tibia
soleal line
what is the area superior to the soleal line called
popliteal area
how many muscles are in the posterior compartment of the leg
7 - 3 superficial and 4 deep
the superficial muscles of the posterior compartment of the leg all insert where
posterior surface of calcaneous via tendocalcaneous
what is the anatomical name for the achilles
tendocalcaneous
all except what muscle cross the ankle joint in the posterior compartment of the leg
popliteus
what is the attachment of the medial head of gastrocnemius
popliteal surface of femur superior to medial condyle
what is the attachment of the lateral head of gastrocnemius
lateral aspect of the lateral condyle of the femur
what is the innervation of the gastrocnemius
tibial nerve (S1, S2)
what is the function of gastrocnemius
plantarflexes ankle
flexes knee
is dorsiflexion or plantarflexion actually extension
dorsiflexion
what is the proximal attachment of plantaris
lateral supracondylar line of femur (proximal to lateral head of gastrocnemius)
what is the innervation of plantaris
tibial nerve (S1, S2)
what is the function of plantaris
assists plantarflexion of ankle
describe the gross appearance of plnataris
small muscle belly and long tendon
what is the proximal attachment of soleus
soleal line of tibia and upper 1/3 posterior fibula
what is present between the proximal bony attachments of soleus
tendinous arch
what is the innervation of soleus
tibial nerve (S1, S2)
what is the function of soleus
plantarflexes ankle join
what are the 3 muscles of the superficial layer of the posterior leg
gastrocnemius
plantaris
soleus
what are the attachments of popliteus
lateral condyle of femur (pit for popliteus) and lateral meniscus to the popliteal area of tibia (above soleal line)
what is the innervation of popliteus
tibial nerve (L4, 5, S1)
what is the function of popliteus
unlocks knee joint by laterally rotating femur on fixed tibia
how does popliteus unlock the knee
ligaments in knee become taut before full extension is reached. Passive rotation of ligaments at the knee joint loosens them enough for extension to be reached - once this occurs cannot flex the knee until popliteus contracts
what are the attachments of flexor digitorum longus
posterior surface of tibia to base of distal phalanx of digits 2-5
what is the innervation of FDL
tibial nerve L5, S1, S2
what is the function of FDL
flexes lateral 4 digits and weak plantarflexor of ankle
how does FDL cross in the foot
obliquely
the tendon of FDL passes ____ to medial malleolus
posterior
what are the attachments of flexor hallucis longus
posterior surface of fibula to the base of the distal phalanx of hallux
what is the innervation of flexor hallucis longus
tibial nerve (L5, S1, S2)
what is the action of flexor hallucis longus
flexes hallux
weak plantarflexor of ankle
describe the course of flexor hallucis longus
proximal attachment is lateral, runs obliquely to pass posterior to medial malleolus then runs along medial aspect of sole of foot to base of big toe
what are the attachments of tibialis posterior
posterior surface of tibia and fibula, interosseous membrane to the tuberosity of the navicular, cuneiforms, cuboid, sustentaculum tali of calcaneus, base of 2nd 3rd and 4th metatarsals (attaches on all tarsal bones except talus)
what is the innervation of tibialis posterior
tibial nerve L4 L5