Lateral Leg

Question 1

Give the origin, insertion, innervation, action, and test for:

Peroneus Longus

Answer 1

Origin:
Head + superior 2/3s of lateral surface of fibula + lateral tibial condyle

Insertion:
1st metatarsal + medial cuneiform (descends posterior to lateral malleolus, after phases under the foot)

Innervation:
Superficial Peroneal Nerve (L5,S1,2)

Action:

• Evert the ankle
• Plantar flexes ankle
• Maintains foot arch

Test:
Evert ankle strongly against resistance. If acting normally, muscle tendon can be seen + palpated inferior to lateral malleolus.

Question 2

Give the origin, insertion, innervation, action, and test for:

Peroneus Brevis

Answer 2

Origin:
Inferior + lateral surface of fibular shaft

Insertion:
Dorsal surface of tuberosity on lateral side of 5th metatarsal

Innervation:
Superficial Peroneal nerve (L5,S1,2)

Action:

• Everts the ankle
• Plantar flexes the ankle

Test:
Evert ankle strongly against resistance. If acting normally, tendon can be seen and palpated posterior to lateral malleolus.

Question 3

Which nerve lies near the great saphenous vein?

Answer 3

Saphenous nerve

Question 4

Which nerve is near the small saphenous vein?

Answer 4

Sural Nerve