Week 4 Flashcards
What is the origin of the Tibialis Anterior?
Anterior proximal tibia, crural fascia (lateral tibial condyle, proximal 2/3 of anteriolateral surface of tibia and interosseous membrane)
What is the insertion of the Tibialis Anterior?
Medial cuneiform and base of 1st metatarsal
What is the action of the Tibialis Anterior?
Dorsiflexion and inversion of ankle
What is the innervation of the Tibialis Anterior?
Deep peroneal (fibular) nerve
What muscles make up the stirrup of the foot?
Tibialis anterior and fibularis longus
What are shinsplints often due to?
Tight or damaged anterior tibialis
What is the origin of the Extensor Digitorum Longus?
Proximal 2/3 of fibula, interosseous membrane, lateral condyle of tibia
What is the insertion of the Extensor Digitorum Longus?
Dorsal surface of digits 2-5 (via dorsal expansion to middle and distal phalanges)
What is the action of the Extensor Digitorum Longus?
Extension of digits 2-5 (at MTP and IP joints), dorsiflexion and eversion of foot
What is the innervation of the Extensor Digitorum Longus?
Deep peroneal (fibular) nerve
What is the origin of the Extensor Hallucis Longus?
Anterior middle 1/3 of fibula and interosseous membrane
What is the insertion of the Extensor Hallucis Longus?
Base of distal phalanx of big toe (dorsal surface)
What is the action of the Extensor Hallucis Longus?
Extension of big toe (at MTP, IP joint), dorsiflexion and inversion of foot
What is the innervation of the Extensor Hallucis Longus?
Deep peroneal (fibular) nerve
What is the origin of the Fibularis (Peroneus) Tertius?
Distal 1/3 of anterior fibula
What is the insertion of the Fibularis (Peroneus) Tertius?
Base of 5th metatarsal (dorsal)
What is the action of the Fibularis (Peroneus) Tertius?
Dorsiflexion and eversion of foot
What is the innervation of the Fibularis (Peroneus) Tertius?
Deep peroneal (fibular) nerve
What is the origin of the Fibularis (Peroneus) Brevis?
Distal lateral ½ of fibula
What is the insertion of the Fibularis (Peroneus) Brevis?
Base of 5th metatarsal (styloid process)
What is the action of the Fibularis (Peroneus) Brevis?
Eversion and plantar flexion of foot
What is the innervation of the Fibularis (Peroneus) Brevis?
Superficial peroneal nerve
What is the origin of the Fibularis (Peroneus) Longus?
Head and proximal lateral shaft of fibula
What is the insertion of the Fibularis (Peroneus) Longus?
Medial cuneiform and base of 1st metatarsal
What is the action of the Fibularis (Peroneus) Longus?
Eversion and plantar flexion of foot
What is the innervation of the Fibularis (Peroneus) Longus?
Superficial peroneal nerve
What muscles make up the stirrup of the foot?
Fibularis longus and tibialis anterior
What is the origin of the Soleus?
Soleal line of tibia, head of fibula and posterior proximal fibula
What is the insertion of the Soleus?
Calcaneus (via calcaneal/Achilles tendon)
What is the action of the Soleus?
Plantar flexion of foot (inversion of foot)
What is the innervation of the Soleus?
Tibial nerve
What is the prime mover for plantar flexion?
Soleus
What is the origin of the Gastrocnemius?
Medial head: above medial condyle of femur (posterior), lateral head: above lateral condyle of femur (posterior)
What is the insertion of the Gastrocnemius?
Calcaneus (via Achilles tendon)
What is the action of the Gastrocnemius?
Plantar flexion of foot (knee flexion and inversion of foot)
What is the innervation of the Gastrocnemius?
Tibial nerve
