Muscle Origin Insertion Action Peroneus longus Lateral surface of shaft of fibula Medial cuneiform & base of 1st metatarsal bone Plantar flexion & Eversion of the foot and supports lateral longitudinal arch Peroneus brevis Base of 5th metatarsal boneġ2 Peroneal Retinacula Superior & Inferior Peroneal Retinacula Connect the lateral malleolus to calcaneum & hold the tendons of Peroneus longus & brevis Synovial Sheaths of Peroneal Longus & Brevis Tendons of peronei are surrounded by a single common tubular synovial sheath, deep to inferior peroneal retinaculum they have separate sheaths Muscles Nerve Artery Peroneus Longus Superficial Peroneal Peroneal (Fibular) Brevis

Medial cuneiform & base of 1st metatarsal bone Dorsi flexion & Inversion of foot and maintains Medial Long arch Extensor dig longus Anterior surface of shaft of fibula Extensor expansion of lat (4) toes Extension of toes & Dorsi flexion of foot Extensor hallucis longus Base of distal phalanx of great toe Dorsi flexion& Inversion of the foot and extension of big toe Peroneus tertius Base of 5th metatarsal bone Dorsiflexion and Eversion of the foot.Ĩ Extensor Retinacula Thickening of deep fascia that keep the long tendons around ankle joint in position Superior Extensor Retinaculum: Attached to anterior borders of tibia & fibula above the ankle Inferior Extensor Retinaculum: Y-shaped band located inferior to the ankleĩ Structures passing Deep to Extensor Retinaculaįrom Medial to Lateral Tibialia anterior tendon Extensor hallucis longus tendon Anterior tibial artery with venae comitantes Deep peroneal N Extensor digitorum longus tendons Peroneus tertius tendon Tibialis anterior Muscles Artery Nerve Tibialis Anterior Tibial Deep Peroneal Ext Dig Longus Ext Hllucius Peroneus TertiusĦ Tibialis Anterior Ext Dig Longus Peroneus tertius Extensor hallucis longusħ Muscle Origin Insertion Action Tibialis anterior Lateral surface of shaft of tibia & interosseous membrane.

Together with the interosseous membrane, the septa divide the leg into 3 compartments : Anterior 2-Lateral (Peroneal) 3-Posterior Each compartment has its own muscles, blood supply and nerve supplyĥ Anterior Compartment Muscles Artery Nerve Deep Peroneal Tibial It binds the two bones and provides attachment for muscles. Intermuscular Septa Two pass from the deep aspect of this fascia to be attached to : Anterior border of fibula (Anterior fascial septum) Posterior border of fibula (Posterior fascial septum) Interosseous membrane: A thin & strong membrane, that binds the interosseous borders of tibia & fibula. The deep fascia surrounds the leg and attached to anterior & medial borders of tibia. Describe the anatomy and contents of the dorsum of the foot List the contents of each compartment (muscles, vessels & nerves). Describe the anatomy of the anterior & lateral compartments. Identify the deep fascia of leg Identify the fascial compartments of the leg. 1 Anterior, Lateral Compartments of the Leg & Dorsum of the FootĢ OBJECTIVES At the end of the lecture, student should be able to:

Compartments of leg action