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Anterior compartment of leg and dorsum of foot
Terms in this set (53)
Name the four muscles of the anterior compartment of the leg
tibialis anterior, extensor hallucis longus, extensor digitorum longus and fibularis tertius
what nerve provides most of the cutaneous innervation to the anterior surface of the ankle and dorsum of the foot?
superficial fibular nerve
to what bone is the inferior extensor retinaculum attached laterally?
what is the most medial structure of the anterior compartment passing through the inferior extensor retinaculum?
tibialis anterior tendon
the tendon of the tibialis anterior muscle attaches to which cuneiform bone and which metatarsal bone?
what is the action of tibialis anterior?
dorsiflexion and inversion of the foot
does the extensor hallucis longus muscle attach to the base of the distal or proximal phalanx of the big toe?
does the extensor hallucis longus dorsiflex the foot?
yes and also extends the big toe
the extensor digitorum muscle attaches to the medial and distal phalanges of which digits?
the fibularis tertius muscle attaches to the dorsal surface of the shaft of which metatarsal bone?
Does the fibularis tertius muscle invert or evert the foot?
to follow the anterior tibial artery proximally you would have to separate which two muscles?
tibialis anterior and extensor digitorum longus
is the extensor digitorum longus medial or lateral to the tibialis anterior?
does the anterior tibial artery pierce the interosseous membrane?
nope! goes over the superior extent
what nerve joins the anterior tibial artery just below the knee?
deep fibular nerve
what is the most commonly injured nerve in the body?
common fibular nerve
what condition would you see after injury to the common fibular nerve?
"foot drop" impairment of eversion and dorsiflexion of the foot, and extension of the toes (also sensory loss on the dorsum of the foot and toes)
where will you find the extensor digitorum brevis and extensor hallucis brevis muscles, and which is medial?
you'll find them on the dorsum of the foot, deep to the tendons of the extensor digitorum longus. The extensor hallucis brevis is more medial
How many tendons arise from the common muscle belly formed by the extensor digitorum brevis and extensor hallucis brevis muscles?
4! to the extensor expansions of digits 1-4
how can you distinguish the extensor hallucis brevis from the extensor digitorum brevis?
the extensor hallucis brevis is the portion of the belly that attaches to the big toe
As the anterior tibial artery crosses the ankle joint, it's name changes to?
dorsalis pedis artery
between which two tendons can you palpate the dorsalis pedis artery?
the extensor hallucis longus medially and the extensor digitorum longus laterally
name the artery that branches off the dorsalis pedis to cross the proximal ends of the metatarsals
wchich dorsal metatarsal arteries are given off by the arcuate artery?
the lateral three (between digits 2-5)
which artery joins the arcuate artery laterally to complete an arterial arch?
lateral tarsal artery
does the lateral tarsal artery pass deep or superficial to the extensor hallucis brevis and extensor digitorum brevis muscles?
between what two metatarsals does the deep plantar artery dive?
first and second
in the dorsum of the foot, the deep fibular nerve can be found coursing with what artery?
The two dorsal digital branches of the deep fibular nerve provide cutaneous innervation to the skin between which two digits?
1 and 2!
abduction and adduction of the toes are defined by which toe?
second! (not the third ya dingus)
what joins the distal slips of the palmar aponeurosis?
superficial transverse metatarsal ligaments
which phalanges does the flexor digitorum brevis attach to?
middle phalanges of digits 2-5
to what does the abductor hallucis brevis attach distally?
the medial side of the base of the proximal phalanx of the great toe
name the distal attachment of the abductor digiti minimi
lateral surface of the base of the proximal phalanx of the fifth toe
name the three muscles of the first layer of the sole of the foot
lateral to medial: abductor digiti minimi, flexor digitorum brevis, abductor hallucis
between what two layers of the sole do the posterior tibial artery and tibial nerve enter the sole of the foot?
the first and second
what is the unique lateral attachment of the quadratus plantae muscle?
the tendon of the flexor digitorum longus (Dick of tom dick and harry)
how do the tendons of the flexor digitorum longus muscle get to the distal phalanges of toes 2-5?
they pass through the split tendons of the flexor digitorum brevis (just like FDP through FDS)
from what do the lumbrical muscles arise and to what do they attach?
they arise from the tendons of the flexor digitorum longus muscle and insert on the medial aspect of the extensor expansions of toes 2-5 (four of them)
name the three muscles of the third layer of the sole
flexor hallucis brevis, adductor hallucis, flexor digiti minimi brevis
what will you find in each of the tendons of the two head of the flexor hallucis brevis?
a sesamoid bone!
where will you find the tendon of the flexor hallucis longus muscle in the sole of the foot?
between the two tendons of the flexor hallucis brevis!
how many heads does the adductor hallucis muscle have?
two! a transverse and oblique head just like the adductor pollicis in the hand
does the flexor digiti minimi brevis muscle attach proximally to any of the cuneiform bones?
nope, it's proximal attachment is to the base of the fifth metatarsal bone
In what layer of the sole of the foot will you find the tibialis posterior tendon?
what artery forms the lateral origin of the plantar arch?
the lateral plantar artery (branch of the posterior tibial artery)
does the plantar arch pass deep or superficial to the oblique head of the adductor hallucis muscle as it passes medially?
what artery forms the medial end of the deep plantar arch and from what does it branch?
the deep plantar artery which branches off the dorsalis pedis artery in the dorsum of the foot
how many dorsal and plantar interosseous muscles are there respectively?
4 and 3
the tendon of the fibularis longus turns deeply around the lateral surface of what?
the cuboid bone
How will you remember the actions of the plantar vs dorsal interosseous muscles?
PAD and DAB (same as in the hand)
name the distal attachment of the fibularis longus tendon (muscle of the lateral compartment of the leg)
the base of the first metatarsal bone and the first cuneiform bone
what is the sustentaculum tali?
bony projection on the medial side of the calcaneus that acts as a pulley to change the direction of force of the flexor hallucis longus muscle
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