Exam 3 All Muscles

Gastrocnemius Origin

Condyles of the femur, posterior surfaces

Gastrocnemius Insertion

Calcaneus via calcaneal tendon

Gastrocnemius Actions (2)

Flex the Knee
Plantar flex the ankle

Soleus Origin

Soleal line; proximal, posterior surface of tibia and posterior aspect of the head of the fibula

Soleus Insertion

Calcaneus via the calcaneal tendon

Soleus Actions (1)

Plantar flex the ankle

Plantaris Origin

Femur

Plantaris Insertion

Calcaneus

Plantaris Actions (2)

Weak plantar flexion of the ankle
Weak flexion of the knee

Tibialis Posterior Origin

Proximal tibia and fibula, and interosseous membrane

Tibialis Posterior Insertion

Tarsal bones and bases of metatarsals 2-4

Tibialis Posterior Actions (2)

Invert the foot
plantar flex the ankle

Flexor Digitorum Longus Origin

Middle, posterior surface of tibia

Flexor Digitorum Longus Insertion

Distal phalanges of toes 2-5

Flexor Digitorum Longus Actions (3)

Flex toes 2-5
Weak plantar flexion of ankle
Invert the foot

Flexor Hallucis Longus Origin

Middle half of posterior fibula

Flexor Hallucis Longus Insertion

Distal phalanx of 1st toe

Flexor Hallucis Longus Actions (3)

Flex the 1st toe
weak plantar flexion of ankle
invert the foot

Popliteus Origin

Lateral femoral condyle

Popliteus Insertion

proximal, posterior tibia

Popliteus actions (2)

Medially rotate the flexed knee
Flex the knee

Peroneus Longus (Fibularis longus) Origin

Head of fibula and proximal two-thirds of lateral fibula

Peroneus Longus (Fibularis longus) Insertion

Base of the 1st metatarsal and medial cuneiform

Peroneus Longus (Fibularis Longus) Actions (2)

Evert the foot
Assist to plantar flex the ankle

Peroneus Brevis (Fibularis Brevis) Origin

Distal two-thirds of lateral fibula

Peroneus Brevis (Fibularis Brevis) Insertion

Tuberosity of 5th metatarsal

Peroneus Brevis (Fibularis Brevis) Actions (2)

Evert the foot
Assist to plantar flex the ankle

Tibialis Anterior Origin

Lateral condyle of tibia; proximal, lateral surface of tibia and interosseous membrane

Tibialis Anterior Insertion

Medial cuneiform and base of the 1st metatarsal

Tibialis Anterior Actions (2)

Invert the foot
Dorsiflex the ankle

Extensor Digitorum Longus Origin

Tibial condyle, proximal fibula, and interosseous membrane

Extensor Digitorum Longus Insertion

Middle and distal phalanges of toes 2-5

Extensor Digitorum Longus Actions (3)

Extend the toes 2-5
Dorsiflex the ankle
Evert the foot

Extensor Hallucis Longus Origin

Middle, anterior fibula and interosseous membrane

Extensor Hallucis Longus Insertion

Distal Phalanx of 1st toe

Extensor Hallucis Longus Actions (3)

Extend the 1st toe
Dorsiflex the ankle
Invert the foot

Flexor Digitorum Brevis Origin

Calcaneus and plantar aponeurosis

Flexor Digitorum Brevis Insertion

Middle phalanges of toes 2-5

Flexor Digitorum Brevis Actions (1)

Flex middle phalanges of toes 2-5

Flexor Hallucis Brevis Origin

Cuboid and lateral cuneiform

Flexor hallucis Brevis Insertion

Proximal phalanx of 1st toe

Flexor hallucis brevis actions (1)

Flex the 1st toe

Abductor Hallucis Origin

Calcaneus and plantar aponeurosis

Abductor Hallucis Insertion

Proximal phalanx of 1st toe and medial sesamoid bone

Abductor Hallucis Actions (2)

Abduct the 1st toe
Assist to flex the 1st toe