KIN 100 - Anterior compartment of the leg (lecture 24) Flashcards
What surrounds all the muscles of the leg
crural fascia
The interosseous membrane and extensions of the crural fascia divide leg muscles into what three compartments
Anterior compartment
Lateral compartment
Posterior compartment
(no medial)
What are the muscles of the anterior leg
Tibialis anterior
Extensor digitorum longus
Fibularis tertius
Extensor hallucis longus
Tibialis anterior
Proximal attachment: Proximal tibia
Distal attachment: Medial cuneiform and base of 1st metatarsal
Innervation: Deep fibular nerve
Actions:
Ankle dosiflexion
Foot inversion
Extensor digitorum longus
Proximal attachment: Proximal tibia and fibula
Distal attachment: Middle and distal phalanges of digits 2-5 via extensor expansions
Innervation: depp fibular nerve
Actions
- Ankle dorsiflexion
- Extension of digits 2-5
Extensor Hallucis Longus
Proximal attachment: Shaft of fibula
Distal attachment: Distal phalanx of first digit
Innervation: Deep fibular nerve
Actions:
- Ankle dorsiflexion
- Extension of first digit
Fibularis tertius
A lateral extension of extensor digitorum longus
Not always present
Proximal attachment: Distal half of fibula
Distal attachment: Base of 5th metatarsal
Innveevation: Deep fibular nerve
Actions:
Ankle dorsiflexion
Foot eversion
Retinaculum at the ankle joint
thickenings of the crural fascia
Helps to anchor tendons that cross the ankle joint and prevent them from “bowstringing” during dorsiflexion
What nerve supplies all muscles in the anterior compartment of the leg
The deep fibular nerve
What are the two divisions of the sciatic nerve
tibial nerve
common fibular nerve
What does the common fibular nerve divide into
superficial fibular nerve
deep fibular nerve
What is major artery found in the anterior compartment of the leg
the anterior tibial artery
What does the popliteal artery split into
Anterior tibial artery
Posterior tibial artery
