neurovascular distribution in plantar foot Flashcards
Dorsomedial side of proximal digit:
deep fibular nerve
dorsolateral side of proximal digit
superficial fibular nerve
distal dorsum and plantar aspect of digit
medial plantar nerve
Anesthesia would block which nerve branches innervating the skin of the second digit?
dorsomedial side :
dorsolateral side:
distal dorsum and plantar aspect of digit:
dm: 1 proper dorsal digital nerve
dl: 1 proper dorsal dig N
distal dorsum and plantar aspect of digit: 2 proper plantar dig nerves
What four intrinsic muscles of the foot are innervated by the Medial plantar nerve
LAFF First lumbrical, abductor hallucis, Flexor hallucis brevis, flexor digitorum brevis. All the rest of the intrinsic muslces of the plantar foot are innervated by the lateral plantar nerve
What does the medial plantar nerve serve
(L4-S3), larger of two terminal branches, innervates 4 intrinsic muscles, innervates the skin of the sole, medial three toes and medial side of 4th toe, then makes way to dorsom of those same toes.
What does the medial plantar nerve course deep to
Abductor hallucis to enter sole
What does the medial plantar nerve travel between
the fascial plane between Abductor hallucis and Flexor digitorum brevis
What does the medial plantar nerve branch into
Proper plantar digital nerve to the medial side of the hallux and terminates at the MT bases by dividing into 3 common plantar digital nerves, each giving off 2 proper plantar digital nerves
What does the lateral plantar nerve serve
(S1-S3) innervates most of the intrinsic plantar muscles, innervates some of the skin on the lateral side, half of the skin on the plantar aspect of the 4th toe and all of the plantar skin of the 5th. Then branches make their way to dorsum of those same 1 1/2 digits
The lateral plantar nerve courses deep to what
Abductor hallucis
What does the lateral plantar nerve pierce
medial intermuscular septum and lateral intermuscular septum
what muscles does the lateral plantar nerve run between
distally and laterally between FDB and QP
How does the Lateral plantar nerve divide / branch
(S1-S3) deep branch (hidden by QP) superficial branch that divides into proper plantar digital branch to lateral side of 5th toe and common plantar digital nerve with a communicating branch and 2 proper plantar digital nerves
Baxter’s nerve branches from what
first branch of lateral plantar nerve and innervates FDB, QP, and AbDM.
What are two primary sites of entrapment for the baxter nerve
- lateral turn btw QP and thick fascia of AbdH 2. anterior course towards medial process which develop a spur
what muscles are innervated by the deep division /branch of the lateral plantar nerve?
adductor hallucis, 1-3 dorsal interossei, 1-2 plantar interossei
What muscles are innervated by the superficial branch of the lateral plantar nerve
flexor digiti minimi brevis , 4th dorsal interossei , 3rd plantar interossei
What is morton’s neuroma
interdigital nerve entrapment - reported in 3rd common digital branch from medial plantar nerve
what is mulder’s test
simultaneous compression of forefoot while applying direct pressure to affected area. right hands squeezes MT heads together, left thumb applies direct pressure at the affected web space where patient feels pain
Branches of the posterior tibial artery
nutrient artery to the tibia, fibular artery, communicating branch, posterior medial malleolar artery, medial calcaneal branches
ALL of the intrinsic muscles of the plantar foot are supplied by branches of the lateral plantar artery except for 3 which are supplied by the medial plantar artery:
Abductor hallucis, Flexor digitorum brevis, First dorsal interosseous
What are the branches of the lateral plantar artery
gives off proper plantar digital artery to the lateral 5th toe, at MT 5 base, curves and becomes the DEEP plantar arch.
What branches off of the deep plantar arch
3 posterior perforatings off the arch, 4 plantar metatarsal arteries, 4 anterior perforating off of the metatarsal arteries with 2 proper plantar digital branches each. 1 digital branch or twig ( from 1st plantar MT artery)
