ONIA: Deep Muscles of Posterior Compartment

Deep Muscles of Posterior Compartment

Popliteus Proximal attachment

Lateral condyle and Lateral meniscus

Popliteus Distal attachment

Posterior surface of tibia & superior to soleal line

Popliteus Nerve

Tibial N. (L4, L5, S1)

Popliteus Action

Weakly flexes knee, unlocks knee by rotating femur 5 degrees, medially rotates tibia of unplanted limb

Flexor Hallucis Longus Proximal attachment

Inferior two thirds of posterior surface of fibula; Inferior part of interosseous membrane

Flexor Hallucis Longus Distal attachment

Base of distal phalanx of great toe (Hallux)

Flexor Hallucis Longus Nerve

Tibial N. (S2,S3)F

Flexor Hallucis Longus Action

Flexes great toe, weakly plantar flexes ankle, supports medial longitudinal arch of foot

Flexor Digitorum Longus Proximal attachment

Medial part of posterior surface of tibia inferior to soleal line; by broad tendon of fibula

Flexor Digitorum Longus Distal attachment

Bases of distal phalanges of lateral four digits

Flexor Digitorum Longus Nerve

Tibial N (S2,S3)

Flexor Digitorum Longus Action

Flexes Lateral four digits, Plantar flexes ankle, Supports longitudinal arches of foot

Tibialis Posterior Proximal attachment

Interosseous membrane; Posterior surface of tibia inferior to soleal line; posterior surface of fibula

Tibialis Posterior Distal attachment

Tuberosity of navicular, cuneiform, cuboid, & sustentaculum tali of calcaneus; Bases of 2-4th metatarsals

Tibialis Posterior Nerve

Tibial N (L4,L5)

Tibialis Posterior Action

Plantar flexes ankle, Inverts foot, maintain medial longitudinal arch