Lateral Compartment of the Leg and Medial Side of the leg Flashcards
[10-minute video]: Anatomy of the Common Peroneal nerve, Superficial Peroneal nerve, Deep Peroneal nerve
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State the points of attachment of the superior fibular retinaculum.
Anteriorly: The posterior aspect of the lateral malleolus
Posteriorly: Lateral aspect of the calcaneus and deep fascia of the leg
[Diagram]
Describe the origin of fibularis longus (3).
- upper 2/3 of the lateral surface of the fibula
- head of fibula
- anterior and posterior intermuscular septae of the leg
Where does fibularis longus insert?
Inferolateral surface of the base of the first metatarsal bone and the adjoining surface of the medial cuneiform bone.
Which muscle is the chief evertor of the foot?
Fibularis longus
Which is the main nerve that innervates the lateral compartment of the leg? State its root values and whether the nerve fibres arise from ventral rami or dorsal rami.
- Superficial fibular nerve
- L5, S1
- It arises from primary ventral rami
State 3 functions of fibularis longus.
- It is the chief evertor of the foot. [Diagram: eversion and inversion]
- It maintains the lateral longitudinal and transverse longitudinal arches of the foot.
- It is a weak plantar flexor of the foot.
- [Diagram: fibularis longus and tibialis anterior]
State the four boundaries of the lateral compartment of the leg.
Anteriorly: anterior intermuscular septum
Posteriorly: posterior intermuscular septum
Medially: lateral surface of the fibula
Laterally: deep fascia of the leg
Describe the origin of fibularis brevis (2).
- Lower 2/3 of the lateral surface of the shaft of the fibula.
- The anterior and posterior intermuscular septa of the leg.
State the insertion of fibularis brevis.
It inserts on the lateral side of the base of the fifth metatarsal bone.
Alternatively: It inserts on the tubercle of the 5th metatarsal
State two functions of fibularis brevis.
- Eversion of the foot
- Weak plantar flexor of the foot
Name the nerve that supplies the skin of the medial side of the big toe.
The medial terminal branch of the superificial fibular nerve
Which nerve supplies the skin of the second interdigital cleft of the foot.
The medial terminal branch of the superficial fibular nerve
Which nerve supplies the skin of the third and fourth interdigital clefts of the foot.
The lateral terminal branch of the superficial fibular nerve
Name the bursa that separates the tendons of sartorius, gracilis and semitendinosus at their point of attachments on the tibia.
Anserine bursa