functional anatomy of the leg

Question 1

anterior compartment muscles (4)

Answer 1

dorsiflexors

1. tibialis ant
2. EHL
3. EDL
4. fibularis tertius

Question 2

tib anterior

Answer 2

dorsiflexes and supinates

Question 3

EHL

Answer 3

extends IP joint of big toe, dorsiflexes ankle

Question 4

EDL

Answer 4

extends MP joints of toes, dorsiflexes

Question 5

fibularis tertius

Answer 5

pronates foot and dorsiflexes ankle

Question 6

deep fibular n

Answer 6

motor: muscles in ant comp
sensory: web space btw first 2 toes

Question 7

ant tibial A.

Answer 7

on to 2 branches of popliteal

main A to ant comp

Question 8

lateral crural compartment muscles (2)

Answer 8

primarily pronate (plantar outward)/evert

1. fibularis longus
2. fibularis brevis

Question 9

sup fibular N.

Answer 9

one of 2 branches of the common fib
supplies lateral comp muscles
sensory to dorsum except the web space btw the first 2 toes

Question 10

main arteries to the post comp

Answer 10

there are none

Question 11

3 post crural comp’s

Answer 11

superficial
deep
central

Question 12

superficial post compartment (2)

Answer 12

plantar flexors

triceps surae muscles

Question 13

triceps surae muscles

Answer 13

gastrocs: 2 joint, also flex knee
soleus
plantaris: weak 2 joint, short muscle, long tendon

Question 14

deep post comp muscles (3)

Answer 14

toe flexors
popliteus: unlocks knee
FHL: IP joint
FDL: DIP joints

Question 15

central post compartment muscles (1)

Answer 15

tibialis posterior

main supinator

Question 16

tibial nerve

Answer 16

all muscles in post. compartment and all muscles of plantar foot
sensory: skin on sole of foot

Question 17

post tibial A.

Answer 17

primary A of post leg

pulse from med malleolus

Question 18

L5 lesion sensory

Answer 18

dorsum of foot

Question 19

compartment syndrome

Answer 19

expansion of muscle mass pushing on fascia that divides the compartments
most common: ant compartment
usually an increase in tibialis ant that is responsible
muscle &/or N ischemia: pain in ant portion of leg

Question 20

shin splints

Answer 20

also in ant comp

muscles expand, fascia stretches, results in tiny bone fractures along tibia

Question 21

foot drop

Answer 21

common fib n damage, loss of function of dorsiflexors, slapping when walking

Question 22

tibial N lesion

Answer 22

paralysis or weakness in sup post comp muscles
cant push off when stepping
dragged limb or exxagerated hip rotation
hopping test