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Anatomy > L12 leg muscles > Flashcards

L12 leg muscles Flashcards

1
Q

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

A 
3 compartments (ant, lat, post)
sacral nerve
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2
Q

muscles of the ant compartment

A

tibialis ant, extensor hallucis longus,

extensor digitorum longus, peroneus tertius

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3
Q

common actions & innervation of the ant leg muscles

A

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

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4
Q

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

A

all except extensor digitorum longus

tibialis ant, extensor hallucis longus, peroneus tertius

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5
Q

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

A

all except tibialis ant

extensor hallucis longus, extensor digitorum longus; peroneus tertius

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6
Q

origin of the tibialis ant

A

lat surface of the tibial shaft; interosseous membrane

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7
Q

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

A

tibialis ant

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8
Q

insertion of ext hallucis longus

A

base of distal digit 1 (big toe)

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9
Q

insertion of peroneus tertius

A

base of 5th metatarsal bone

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10
Q

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

A

ext digitorum longus

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11
Q

insertion of the tibialis ant

A

medial cuneiform & base of metatarsal 1

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12
Q

ant leg muscle usually considered a part of ext digitorum longus

A

peroneus tertius

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13
Q

most superificial & medial leg muscle

A

tibialis ant

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14
Q

lat leg muscles

A

peroneus longus, peroneus brevis

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15
Q

origin & nerve supply of lat leg muscles

A

O — lat surface of fibular shaft

N — sup. peroneal nerve

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16
Q

common actions of the lat leg muscles

A 
plantarflexion of foot
foot eversion (at subtalar & transverse talar joints)
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17
Q

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

A

peroneus longus

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18
Q

post sup. leg muscles

A

gastrocnemius (medial & lat heads), plantaris, soleus

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19
Q

nerve supply of the post leg muscles

A

sup — tibial portion of the sciatic nerve

deep — tibial nerve

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20
Q

muscles of the triceps surae

A

gastrocnemius, soleus

21
Q

common actions of the post leg muscles

A

plantarflexion at the ankle joint

22
Q

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

A

gastrocnemius & plantaris; cuz they’re 2 jointed muscles

23
Q

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

A

soleus

24
Q

origin of the gastrocnemius

A

lat head - lat femoral condyle

medial head - medial femoral condyle

25
Q

the gastrocnemius inserts via ____ into the post surface of ___

A

tendo-calcaneus; calcaneum

26
Q

origin of the soleus

A

tibial & fibular shafts

27
Q

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

A

plantaris

28
Q

layers of the post leg muscles

A

sup. & deep

29
Q

the plantaris & soleus both insert at where

A

post surface of calcaneum

30
Q

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

A

soleus; single jointed muscle

31
Q

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

A

plantaris

32
Q

post deep leg muscles

A

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

33
Q

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

A

flexor digitorum longus, flexor hallucis longus

34
Q

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

A

popliteus

35
Q

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

A

tibialis posterior

36
Q

origin of the flexor digitorum longus

A

post surface of tibial shaft

37
Q

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

A

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

38
Q

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

A

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

39
Q

action of the flexor digitorum longus & flexor hallucis longus

A 
flexes toes
- digitorum => lat 4 toes
- hallucis => big toe
flexes foot at ankle joint
supports foot arch
- digitorum => med & lat
- hallucis => med
40
Q

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

A

popliteus

41
Q

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

A

navicular

42
Q

insertion of the flexor digitorum longus & flexor hallucis longus

A

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

43
Q

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

A

flex; unlocks; LR; ligs

44
Q

post deep leg muscle that acts to support med foot arch

A

flexor hallucis longus

45
Q

post deep leg muscle found between flexor digitorum & hallucis longus

A

tibialis posterior

46
Q

which compartment of the leg muscles invert the foot

A

ant

47
Q

which compartment of the leg muscles evert the foot

A

lat

48
Q

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

A

d. biceps femoris

Anatomy (7 decks)

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