14. Anterolateral Leg (No OIAN) Flashcards
What provides blood supply to the lateral compartment of the leg?
Perforating branches of the fibular artery
Where does the common fibular nerve split into the superficial and deep branches?
Between the fibula and the fibularis longus muscle, around the head of the fibula
What is the Fibular Trochlea?
A ridge on the lateral surface of the calcaneus
What are the terminal branches of the anterior tibial artery?
Dorsalis pedis
Lateral malleolar artery
What provides sensation to the majority of the dorsum of the foot?
Superficial fibular nerve (misses the flip flop spot supplied by the medial branch of the deep fibular)
Why do you often see edema in the legs of elderly people?
Because their crural fascia is more lax, and thus their musculovenous pump is less effective
What are the terminal branches of the deep fibular nerve?
Medial and Lateral branches of the deep fibular nerve
What artery supplies the anterior compartment?
Anterior tibial artery
The extensor retinaculum is a thickening of what structure?
The crural fascia
What muscle does fibularis tertius fuse with?
Extensor digitorum longus
What compartment of the leg contains no arteries?
The lateral compartment
What bone has a specific groove for the fibularis longus?
The cuboid
What three muscles are responsible for eversion of the foot?
Fibularis longus and brevis
Fibularis tertius
What is the function of the lateral branch of the deep fibular nerve?
Innervates the intrinsic muscles of the dorsum of the foot (extensor hallucis brevis and extensor digitorum brevis)
Where is the common fibular nerve vulnerable to being struck?
Where it winds around the head of the fibula, because it is the most superficial there.
What muscle should we associate with shin splints?
Tibialis anterior
What two muscles invert the foot?
Tibialis posterior and anterior
What nerve supplies the muscles of the anterior compartment?
Deep fibular nerve
What is the function of the medial branch of the deep fibular nerve?
Sensory innervation to the flip flop area
(medial branch innervates part of the medial two toes)
What pulley structure on the calcaneus does the tendon of the fibularis longus muscle pass under?
Fibular trochlea
What might cause foot drop?
Injury to the common fibular nerve (in the case of loss of both dorsiflexion and eversion)
Injury to the deep fibular nerve (in the case of loss of just dorsiflexion, but not eversion)
What does “peroneal” mean?
Fibular
How does the musculovenous pump in the leg work?
The crural fascia is tight enough that when the muscles of the leg contract, they must expand inward instead of outward. This pushes blood up the veins of the leg, since they have valves that prevent blood from seeping down the leg.
What vessel does the fibular artery come off of?
The posterior tibial artery
What nerve supplies the muscles of the lateral compartment?
Superficial fibular nerve
What kind of gait accompanies damage to the common fibular nerve?
“High stepping gait”
What artery runs with the deep fibular artery?
The anterior tibial artery
