lower extremity 2

Question 1

Sciatic nerve divides into

Answer 1

common peroneal nerve

tibial nerve

Question 2

common peroneal (fibular) nerve divides into

Answer 2

superficial peroneal nerve (fibularis longus/brevis-skin of distal 1/3 anterior surface of leg)

deep peroneal nerve (anterior muscles of leg)

Question 3

Tibial Nerve

Answer 3

posterior muscles of leg, knee, sensation along medial plantar surface of foot

Question 4

Tibial nerve divides into

Answer 4

medial plantar and lateral plantar nerve

Question 5

Saphenous nerve

Answer 5

branch of femoral nerve – supplies “medial” surfaces of the leg and foot

Question 6

Sural nerve

Answer 6

branch of the sciatic nerve – supplies “posterior” regions down to the foot

Question 7

medial plantar nerve

Answer 7

intrinsics of foot, sensation on medial surface

Question 8

lateral plantar nerve

Answer 8

intrinsic muscles of foot, sensation on lateral side

Question 9

popliteal artery divides into

Answer 9

anterior tibial artery and posterior tibial artery

Question 10

anterior tibial artery

Answer 10

• anterior to interossius membrane
• terminates at dorsal pedic artery–> anastomos with plantar arch

dorsal pedis pulse

Question 11

posterior tibial artery

Answer 11

gives off peroneal artery

passes posterior to medial malleolus

splits into medial plantar and lateral plantar–> supply bottom of foot

forms plantar arch which communicates with dorsal side of foot (via dorsal pedis from anterior tibial artery)

Question 12

Proximal tibiofibular joint

Answer 12

head of fibular articulates with lateral condyle of tibia

Question 13

distal tibiofibular joint

Answer 13

medial surface of fibula with facet on inferior end of tibia

Question 14

functions of ankle/foof joint

Answer 14

a. Provide stability and mobility
b. provide stable base for weight bearing forces
c. absorb shock as foot hits the ground
d. provide lever system for gait (acts as rigid lever for push off)
e. permit foot to conform to different surfaces
f. absorb rotational forces of LE
ER = supination
IR = pronation)

Question 15

motion of sagittal plane of ankle jt

Answer 15

dorsiflex/plantar flex

Question 16

motion of frontal place of ankle jt

Answer 16

eversion/inversion

Question 17

motion of transverse plane of ankle jt

Answer 17

abduction

adduction

Question 18

Supination

Answer 18

inversion of hind foot
adduction forefoot
plantarflexion of ankle

Question 19

pronation

Answer 19

eversion of hindfoot
abduction forefoot
dorsiflex ankle

Question 20

motion of ankle jt

Answer 20

dorsiflex and plantar flex

most stable in dorsiflex

Question 21

MCL-deltoid ligament

Answer 21

protects against eversion of ankle

Question 22

LCL

Answer 22

opposes inversion of ankle

Question 23

sections of MCL

Answer 23

tibionavicular
anterior tibiotalar
posterior tibiotalar
tibiocalcaneal

Question 24

sections of LCL

Answer 24

anterior talofibular
posterior talofibular
calcaneofibular

Question 25

Subtalar jt

Answer 25

dampens rotational forces of the leg and force

Question 26

transverse tarsal jt

Answer 26

connects mid foot and hind foot

Question 27

TCN (talocalcaneonavicular jt)

Answer 27

critical for foot movement (ball bearing)

moving calcaneous & talus forces forefoot to move

Question 28

Tarsal metatarsal joint

Answer 28

divides midfoot and forefoot

site of lisfranc amputation or sprain

Question 29

MTP jt

Answer 29

flexion/extension of phalanges