L12 leg muscles

Question 1

the leg muscles is divided into __ compartments & each has a major nerve from the ___

Answer 1

3 compartments (ant, lat, post)
sacral nerve

Question 2

muscles of the ant compartment

Answer 2

tibialis ant, extensor hallucis longus,

extensor digitorum longus, peroneus tertius

Question 3

common actions & innervation of the ant leg muscles

Answer 3

actions — ankle dorsiflexion (extends foot at ankle joint); toe extension; foot inversion
innervation— deep peroneal nerve

Question 4

which ant leg muscles inverts foot at the subtalar and transverse talar joints

Answer 4

all except extensor digitorum longus

tibialis ant, extensor hallucis longus, peroneus tertius

Question 5

which ant leg muscles originate at the ant surface of the fibular shaft

Answer 5

all except tibialis ant

extensor hallucis longus, extensor digitorum longus; peroneus tertius

Question 6

origin of the tibialis ant

Answer 6

lat surface of the tibial shaft; interosseous membrane

Question 7

which ant leg muscle holds up the medial arch of the foot

Answer 7

tibialis ant

Question 8

insertion of ext hallucis longus

Answer 8

base of distal digit 1 (big toe)

Question 9

insertion of peroneus tertius

Answer 9

base of 5th metatarsal bone

Question 10

which ant leg muscle inserts at the ext expansion of the lat 4 toes

Answer 10

ext digitorum longus

Question 11

insertion of the tibialis ant

Answer 11

medial cuneiform & base of metatarsal 1

Question 12

ant leg muscle usually considered a part of ext digitorum longus

Answer 12

peroneus tertius

Question 13

most superificial & medial leg muscle

Answer 13

tibialis ant

Question 14

lat leg muscles

Answer 14

peroneus longus, peroneus brevis

Question 15

origin & nerve supply of lat leg muscles

Answer 15

O — lat surface of fibular shaft

N — sup. peroneal nerve

Question 16

common actions of the lat leg muscles

Answer 16

plantarflexion of foot
foot eversion (at subtalar & transverse talar joints)

Question 17

which lat leg muscle supports foot arch (longitudinal & transverse)

Answer 17

peroneus longus

Question 18

post sup. leg muscles

Answer 18

gastrocnemius (medial & lat heads), plantaris, soleus

Question 19

nerve supply of the post leg muscles

Answer 19

sup — tibial portion of the sciatic nerve

deep — tibial nerve

Question 20

muscles of the triceps surae

Answer 20

gastrocnemius, soleus

Question 21

common actions of the post leg muscles

Answer 21

plantarflexion at the ankle joint

Question 22

which post leg muscles also act to weakly flex the knee joint, & how can they do this too?

Answer 22

gastrocnemius & plantaris; cuz they’re 2 jointed muscles

Question 23

which post leg muscle gives the main propulsive force in walking & running

Answer 23

soleus

Question 24

origin of the gastrocnemius

Answer 24

lat head - lat femoral condyle

medial head - medial femoral condyle

Question 25

the gastrocnemius inserts via ____ into the post surface of ___

Answer 25

tendo-calcaneus; calcaneum

Question 26

origin of the soleus

Answer 26

tibial & fibular shafts

Question 27

which post sup. leg muscle originates at the lat supracondylar ridge of the femur

Answer 27

plantaris

Question 28

layers of the post leg muscles

Answer 28

sup. & deep

Question 29

the plantaris & soleus both insert at where

Answer 29

post surface of calcaneum

Question 30

among the sup post leg muscles, the strongest plantarflexor is the __ cuz it’s a ___

Answer 30

soleus; single jointed muscle

Question 31

it’s the post sup leg muscle that’s small & absent in abt 7-20% of limbs

Answer 31

plantaris

Question 32

post deep leg muscles

Answer 32

popliteus, flexor digitorum longus, flexor hallucis longus, tibialis post

Question 33

which post deep muscles originate at the post surface of the tibial shaft

Answer 33

flexor digitorum longus, flexor hallucis longus

Question 34

which post deep leg muscle originates at the lat surface of lat condyle of femur

Answer 34

popliteus

Question 35

which post deep leg muscle originates at the post surface of tibial & fibular shafts, and the interosseous membrane

Answer 35

tibialis posterior

Question 36

origin of the flexor digitorum longus

Answer 36

post surface of tibial shaft

Question 37

what’ the action of the popliteus a) plantar flexes the foot at ankle joint, inverts foot at subtalar and transverse talar joints, supports med & longitudinal arch of foot b) flexes leg at knee joint, unlocks knee joint by LR of femur on tibia & slackens lig of joint c) flexes lat 4 toes, plantar flexes foot at ankle joint, supports med & longitudinal arch of foot

Answer 37

b) flexes leg at knee joint, unlocks knee joint by LR of femur on tibia & slackens lig of joint

Question 38

what’ the action of the tibialis post a) plantar flexes the foot at ankle joint, inverts foot at subtalar and transverse talar joints, supports med & longitudinal arch of foot b) flexes leg at knee joint, unlocks knee joint by LR of femur on tibia & slackens lig of joint c) flexes lat 4 toes, plantar flexes foot at ankle joint, supports med & longitudinal arch of foot

Answer 38

a) plantar flexes the foot at ankle joint, inverts foot at subtalar and transverse talar joints, supports med & longitudinal arch of foot

Question 39

action of the flexor digitorum longus & flexor hallucis longus

Answer 39

``` flexes toes - digitorum => lat 4 toes - hallucis => big toe flexes foot at ankle joint supports foot arch - digitorum => med & lat - hallucis => med ```

Question 40

which deep post leg muscle inserts at the post surface of the tibial shaft above the soleal line

Answer 40

popliteus

Question 41

tibialis post inserts at the tuberosity of ___ and other nearby bones

Answer 41

navicular

Question 42

insertion of the flexor digitorum longus & flexor hallucis longus

Answer 42

base of distal digits digitorum = lat 4 toes hallucis = toe 1

Question 43

the popliteus acts to ___ leg at knee joint; ___ knee joint by ___ of femur on tibia; slacken __ of joints

Answer 43

flex; unlocks; LR; ligs

Question 44

post deep leg muscle that acts to support med foot arch

Answer 44

flexor hallucis longus

Question 45

post deep leg muscle found between flexor digitorum & hallucis longus

Answer 45

tibialis posterior

Question 46

which compartment of the leg muscles invert the foot

Answer 46

ant

Question 47

which compartment of the leg muscles evert the foot

Answer 47

lat

Question 48

which muscle attaches to the fibular head and gives more stability to the prox. tibiofibular joint? a. popliteus b. semitendinosus c. fibularis (peroneus) longus d. biceps femoris

Answer 48

d. biceps femoris