Chapter 11 Ankle and Foot Joints Flashcards
Gastrocnemius O&I
Origin: Medial head- posterior surface of the medial femoral condyle
Lateral head- Posterior surface of the lateral femoral condyle
Insertion: posterior surface of the calcaneous (Achilles tendon)
Gastrocnemius Action
plantar flexion of the ankle, flexion of the knee
Gastrocnemius Innervation
Tibial Nerve (S1, S2)
Soleus O&I
Origin: posterior surface of the proximal fibula and proximal 2/3 of the posterior tibial surface
Insertion: posterior surface of the calcaneous (Achilles tendon)
Soleus Action
plantar flexion of the ankle
Soleus Innervation
Tibial Nerve (S1, S2)
Tibialis Posterior O&I
Origin: posterior surface of the upper half of the interosseous membrane and the adjacent surfaces of the tibia and fibula
Insertion: inferior surfaces of the navicular, cuneiform, and cuboid bones and buses of the 2nd, 3rd, and 4th metatarsal bones
Tibialis Posterior Action
inversion of the foot, plantar flexion of the ankle
Tibialis Posterior Innervation
Tibial Nerve (L5, S1)
Flexor Digitorum Longus O&I
Origin: middle 1/3 of the posterior surface of the tibia
Insertion: base of the distal phalanx of each of the four lesser toes
Flexor Digitorum Longus Action
flexion of the four lesser toes at the metatarsophalangeal and the PIP and DIP joints, planter flexion of the ankle, inversion of the foot
Flexor Digitorum Longus Innervation
Tibial Nerve (L5, S1)
Flexor Hallicus Longus O&I
Origin: middle 2/3 of the posterior surface of the fibula
Insertion: Base of the distal phalanx of the great toe; plantar surface
Flexor Hallicus Longus Action
flexion of the great toe at the MP and IP joints, plantar flexion of the ankle, inversion of the foot
Flexor Hallicus Longus Innervation
Tibial Nerve (L5, S1, S2)
Peroneus (fibularus) Longus O&I
Origin: head and upper 2/3 of the lateral surface of the fibula
Insertion: undersurfaces of the medial cuneiform and 1st metatarsal bone
Peroneus (fibularus) Longus Action
eversion of the foot, plantar flexion of the ankle
Peroneus (fibularus) Longus Innervation
Superficial Peroneal Nerve (L4, L5, S1)
Peroneus (fibularis) Brevis O&I
Origin: Mid to lower 2/3 of the lateral surface of the fibula
Insertion: tuberosity of the 5th metatarsal bone
Peroneus (fibularis) Brevis Action
eversion of the foot, plantar flexion of the ankle
Peroneus (fibularis) Brevis Innervation
Superficial Peroneal Nerve (L4, L5, S1)
Peroneus (fibularis) Tertius O&I
Origin: distal 1/3 of the anterior fibula
Insertion: Superior aspect of the base of the 5th metatarsal
Peroneus (fibularis) Tertius Action
dorsiflexion of the ankle and eversion of the foot
Peroneus (fibularis) Tertius Innervation
Deep Peroneal Nerve (L4, L5, S1)
Externsor Digitorum Longus O&I
Origin: lateral condyle of the tibia, head o the fibula, and upper 2/3 of the anterior surface of the fibula
Insertion: tops of the middle and distal phalanges of the four lesser toes
Externsor Digitorum Longus Action
extension of the four lesser toes at the MP, PIP, and DIP joints
dorsiflexion of the ankle, eversion of the foot
Externsor Digitorum Longus Innervation
Deep Peroneal Nerve (L4, L5, S1)
Extensor Hallicus Longus O&I
Origin: middle 2/3 of the medial surface of the anterior fibula
Insertion: Base of the distal phalanx of the great toe
Extensor Hallicus Longus Action
extension of the great toe at MP and IP joints
Dorsiflexion of the ankle, weak inversion of the foot
Extensor Hallicus Longus Innervation
Deep Peroneal Nerve (L4, L5, S1)
Tibialis Anterior O&I
Origin: upper 2/3 of the lateral surface of the tibia
Insertion: inner surface of the medial cuneiform and the base of the 1st metatarsal bone
Tibialis Anterior Action
dorsiflexion of the ankle, inversion of the foot
Tibialis Anterior Innervation
Deep Peroneal Nerve (L4, L5, S1)
