LATERAL Fascial Compartment of the Lower Limb

Question 1

Peroneus Longus

Intrinsic or Extrinsic?
Origin
Insertion
Nerve supply
Action

Answer 1

Extrinsic

Origin: Lateral surface of shaft of fibula

Insertion: Base of 1st metatarsal and medial cuneiform

Nerve supply: Superficial peroneal nerve

Action: Plantar flexes foot at ankle joint; everts foot at subtalar and transverse tarsal joints; supports lateral longitudinal and transverse arches of foot

Question 2

Peroneus Brevis

Intrinsic or Extrinsic?
Origin
Insertion
Nerve supply
Action

Answer 2

Extrinsic

Origin: Lateral surface of shaft of fibula

Insertion: Base of 5th metatarsal bone

Nerve supply: Superficial peroneal nerve

Action: Plantar flexes foot at ankle joint; everts foot at subtalar and transverse tarsal joint; supports lateral longitudinal arch of the foot