Lower Leg Anatomy

Tibialis Posterior Anatomy: Origin, Insertion, Action, Innervation

Tibialis Posterior Anatomy Study: Origin, Insertion, Action, Innervation and Blood Supply Origin: Proximal two-thirds of the posterior surfaces of the tibia and the fibula and the interosseus membrane. Insertion: Passing behind the medial malleolus to attach to the bones that form the arch of the foot: the navicular, each cuneiform and cuboid the calcaneus and metatarsals…

Read More

Soleus Anatomy: Origin, Insertion, Action, Innervation

Soleus Anatomy Study: Origin, Insertion, Action, Innervation, and Blood Supply Origin: Posterior surface of the head and proximal quarter of the shaft of the fibula, spanning over to the soleal line and the middle third of the medial border of the tibia, and a fibrous band, which arches over the popliteal vessels and tibial nerve, between…

Read More

Peroneus Tertius Anatomy: Origin, Insertion, Action

Anatomy Study: Origin, Insertion, Action and Innervation of the Peroneus Tertius Muscle Origin: Distal third or more of the anterior surface of the fibula, the adjoining anterior surface of the interosseous membrane and the anterior intermuscular septum Insertion: Inserts into the medial part of the dorsal surface of the base of the fifth metatarsal and usually sends an…

Read More

Flexor Hallucis Longus Anatomy: Origin, Insertion, Action

Flexor Hallucis Longus Muscle Anatomy Study Origin: Distal two-thirds of the posterior surfaces of the fibula, the adjacent interosseus membrane, the posterior intermuscular septum, and the lateral part of the fascia covering tibialis posterior Insertion: Plantar aspect of the base of the distal phalanx of the great toe after traveling between the two sesamoids associated…

Read More

Gastrocnemius Muscle Anatomy Study: Origin, Insertion, Action and Innervation

Gastrocnemius Muscle Anatomy Study: Origin, Insertion, Action and Innervation Origin: Medial head: the depression at the upper and posterior part of the medial condyle of the femur and continuing behind the adductor tubercle to a slightly raised area on the popliteal surface of the femur, just above the medial condyle. Lateral head: area on the lateral…

Read More

Peroneus Brevis Muscle Anatomy: Origin, Insertion, Action

Peroneus Brevis Muscle Anatomy Study: Origin, Insertion, Action and Innervation Origin: Distal two-thirds of the lateral surface of the fibula, and the anterior and posterior intermuscular septa Insertion: Tubercle on the base of the lateral aspect of the fifth metatarsal. Action: Eversion of the foot at the subtalar joint Innervation: Superficial Peroneal Nerve (L5, S1) Blood Supply: Branches…

Read More

Peroneus Longus Muscle Anatomy: Origin, Insertion, Action

Peroneus Longus Muscle Anatomy Study: Origin, Insertion, Action and Innervation Origin: Head and proximal two-thirds of the lateral surface of the fibula, and the anterior and posterior intermuscular septa of the leg. Insertion: Passing behind the lateral malleolus, running obliquely across the sole of the foot from lateral to medial, and ending on the base of…

Read More

Extensor Hallucis Longus Muscle Anatomy: Origin, Insertion, Action

Anatomy Study: Origin, Insertion, Action and Innervation of the Extensor Hallucis Longus Muscle Origin: Middle half of the medial surface of the fibula, medial to extensor digitorum longus, and adjacent anterior surface of the interosseous membrane Insertion: Dorsal aspect of the base of the distal phalanx of the great toe Action: Extension of the great…

Read More

Extensor Digitorum Longus Muscle Anatomy: Origin, Insertion, Action

Extensor Digitorum Longus Muscle Anatomy Study: Origin, Insertion, Action and Innervation Origin: Lateral condyle of the tibia, the proximal two-thirds of the medial surface of the fibula, the adjacent anterior surface of the interosseous membrane, the anterior intermuscular septum, and the septum between it and tibialis anterior. Insertion: Divides into four slips and inserts at the…

Read More

Plantaris Muscle Anatomy: Origin, Insertion, Action, Innervation

Plantaris Muscle Anatomy Study Origin: Lateral supracondylar ridge of the femur above the lateral head of the gastrocnemius. Insertion: Medial aspect of the posterior surface of the calcaneus, medial to the Achilles tendon. Action: Assists with flexion of the knee. Assist with plantarflexion of the foot at the ankle Innervation: Tibial Nerve (S1,2) Blood Supply: Popliteal Artery Synergist: Gastrocnemius…

Read More

Tibialis Anterior Anatomy: Origin, Insertion, Action, Innervation

Tibialis Anterior Anatomy Study: Origin, Insertion, Actions, Innervation, Blood Supply Origin: Lateral condyle and proximal half to two-thirds of the lateral surface of the tibial shaft, the adjoining anterior surface of the interosseous membrane and the intermuscular septum between it and the extensor digitorum longus. Insertion: Inferomedial aspect of the medial cuneiform and base of…

Read More

Popliteus Muscle Anatomy: Origin, Insertion, Action, Innervation

Popliteus Muscle Anatomy Study: Origin, Insertion, Action and Innervation Origin: The lateral surface of the lateral condyle of the femur. Insertion: Medial 2/3rds of the triangular area above the soleal line on the posterior surface of the tibia. Action: Internal rotation of the knee; Assists with flexion of the leg at the knee Blood Supply: Popliteal artery…

Read More