MSK, Anterior and Lateral Compartments of the Leg

Question 1

superficial fibular nerve

Answer 1

provides most of the cutaneous innervation to the anterior surface of the ankle and dorsum of the foot; division of the common fibular nerve; runs along the lateral side of the leg

Question 2

extensor retinacula

Answer 2

retinacula are transverse thickenings of the crural fascia that hold tendons in place

Question 3

tibialis anterior muscle

Answer 3

Proximal Attachment: Lateral condyle of the tibia
Distal Attachment: Medial cuneiform and base of 1st metatarsal
Innervation: Deep fibular nerve
Action: Dorsiflexes ankle and inverts foot

Question 4

extensor digitorum longus muscle

Answer 4

Proximal Attachment: Lateral condyle of tibia and proximal fibula
Distal Attachment: Phalanges of toes 2-5
Innervation: Deep fibular nerve
Action: Extends lateral four digits and dorsiflexes ankle

Question 5

extensor hallucis longus

Answer 5

Proximal Attachment: Fibula
Distal Attachment: phalanx of the great toe
Innervation: Deep fibular nerve
Action: extends the great toe; dorsiflexes the ankle

Question 6

anterior tibial artery

Answer 6

arises from the popliteal artery; supplies the anterior leg and dorsum of the foot

Question 7

deep fibular nerve

Answer 7

arises from the common fibular nerve on the anterior side of the leg; damage to the nerve can cause ‘FOOT DROP’

Question 8

Tibialis anterior tendon

Answer 8

tendon of the tibialis anterior muscle; attaches to the medial cuneiform and base of 1st metatarsal

Question 9

Extensor hallucis longus tendon

Answer 9

tendon of the extensor hallucis longus; attaches to the phalanx of the great toe

Question 10

Extensor digitorum longus tendon

Answer 10

tendon of the extensor digitorum longus; attaches to the phalanges of toes 2-5

Question 11

fibularis tertius muscle

Answer 11

Proximal Attachment: Distal fibula
Distal Attachment: 5th metatarsal
Innervation: Deep fibular nerve
Action: Dorsiflexes ankle and aids in eversion of foot

Question 12

dorsalis pedis artery

Answer 12

the anterior tibial artery becomes the dorsalis pedis artery as it crosses the ankle joint; pulse can be felt between the tendons of the extensor hallucis longus muscle and the extensor digitorum longus muscle

Question 13

deep plantar artery

Answer 13

arises from the dorsalis pedis artery near the origin of the arcuate artery; the deep plantar artery passes between the first and second metatarsal bones to enter the sole of the foot. In the sole of the foot, the deep plantar artery anastomoses with the plantar arch

Question 14

fibularis longus

Answer 14

Proximal Attachment: fibular head and shaft
Distal Attachment: 1st metatarsal and medial cuneiform bone
Innervation: superficial fibular nerve
Action: Everts foot; weak plantarflexion

Question 15

fibularis brevis

Answer 15

Proximal Attachment: distal fibula
Distal Attachment: tuberosity of the 5th metatarsal
Innervation: superficial fibular nerve
Action: Evert the foot; weak plantarflexion