W2 Appendicular Muscles Lower Leg (BIO 201, Practical 2)

Tibialis Anterior

Extensor Digitorum Longus

Extensor Hallucis Longus

Tibialis Anterior, Extensor Digitorum Longus, Extensor Hallucis Longus

Action: dorsiflexion

Lateral condyle and lateral margin of proximal half of tibia

Origin of Tibialis Anterior

Median cuneiform, metarsal 1

Insertion of Tibialis Anterior

Fibularis Longus and Brevis

Soleus

Gastrocnemius

Fibularis Longus and Brevis, Soleus, Gastrocnemius

Plantar Flexion

Condyles, capsules of knee joint

Origin of gastrocnemius

Calcaneus

Insertion of gastrocnemius

Posterior surface of head of fibula and proximal one fourth of tibia. Interosseous membrane

Origin of soleus

Calcaneus

Insertion of soleus

origin of tibialis anterior

lateral condyle and lateral margin of proximal half of tibia

insertion of tibialis anterior

median cuneiform, metatarsal I

action of tibialis anterior

dorsiflexes foot, inverts foot, resists backward tipping of body

extensor digitorum longus action

extends toes, dorsiflexes foot

extensor hallucis longus action

extends hallux, dorsiflexes foot

fibularis longus and brevis action

everts foot, plantar flexes foot

origin of gastrocnemius

condyles, popliteal surface and lateral supracondylar line of femur, capsule of knee joint

insertion of gastrocnemius

calcaneus

action of gastrocnemius

plantar flexes foot, flexes knee

origin of soleus

posterior surface of head of fibula and proximal one-fourth of tibia; interosseous membrane

insertion of soleus

calcaneus

action of soleus

plantar flexes foot, steadies leg on ankle during standing