Lateral compartment of leg

Question 1

Peroneus longus:
* Origin
* Insertion
* Nerve supply
* Action

Answer 1

• Origin - proximal 2/3 of the lateral surface of fibula and intermuscular septa
• Insertion - lateral side of the base of the 1st metatarsal and the adjoining part of the medial cuneiform.
• Nerve supply - superficial peroneal nerve (L5, S1).
• Action - eversion of foot and assists plantarflexion of the ankle. In addition, peroneus longus is a factor in maintaining the lateral longitudinal and transverse arches of the foot.

Question 2

Peroneus brevis:
* Origin
* Insertion
* Nerve supply
* Action

Answer 2

• Origin - distal 2/3 of lateral fibula.
• Insertion - base of 5th metatarsal.
• Nerve supply - superficial peroneal nerve (L5, S1).
• Action - eversion of foot and assists plantarflexion of the ankle.