leg muscles and innervations

Question 1

Tibialis Anterior Attachments

Answer 1

lateral condyle and lateral surface of proximal half of tibia, interosseus membrane

medial and inferior surface of medial cuneiform and base of 1st metatarsal

Question 2

Tibialis Anterior Actions

Answer 2

dorsiflexes ankle and inverts foot

Question 3

Tibialis Anterior Innervation

Answer 3

Deep fibular nerve

Question 4

Extensor Digitorum Longus Attachments

Answer 4

Lateral condyle of tibia, medial surface prximal 3/4 of fibula, interosseus membrane

middle and distal phalanges of lateral 4 digits

Question 5

Extensor digitorum longus action

Answer 5

extends lateral 4 digits

dorsiflexes foot

Question 6

Extensor Digitorum Longus Innervation

Answer 6

deep fibular nerve

Question 7

Extensor Hallucis Longus attachments

Answer 7

middle part anterior surface of fibula and interosseus membrane

dorsal aspect of base of distal phalanx of 1st digit

Question 8

Extensor Hallucis Longus Innervation

Answer 8

Deep fibular nerve

Question 9

Fibularis Tertius attachment

Answer 9

Inferior third of anterior surface of fibula and interosseus membrane

dorsum of base of 5th metatarsal

Question 10

Fibularis Tertius action

Answer 10

dorsiflexes foot

aids in eversion

Question 11

Fibularis Tertius Innervation

Answer 11

deep fibular nerve

Question 12

Fibularis Longus attachment

Answer 12

head and superior 2/3 lateral surface of fibular

Plantar aspect base 1st metatarsal and medial cuneiform

Question 13

Fibularis Longus Action

Answer 13

evert and weakly plantarflex foot

Question 14

Fibularis longus innervation

Answer 14

superficial fibular nerve

Question 15

fibularis brevis attachment

Answer 15

inferior 2/3 lateral surface of fibula

dorsal surface of tuberosity of base of 5th metatarsal

Question 16

Fibularis brevis action

Answer 16

evert and weakly plantarflexes foot

Question 17

fibularis brevis innervation

Answer 17

superficial fibular nerve

Question 18

Gastrocnemius attachment

Answer 18

medial head: popliteal surface superior to medial condyle

lateral head: lateral aspect of lateral condyle

calcaneal tendon

Question 19

Plantaris attachment

Answer 19

lateral supracondylar line of femur, oblique popliteal ligament

calcaneal tendon

(plantaris is absent in 5-10% of people. often used as a transplant muscle)

Question 20

Soleus Attachment

Answer 20

posterior head of fibula, soleal line of tibia

Question 21

Where do the Gastrocnemisu, plantaris, and soleus all attach? What action do they all do? What are they all innervated by>

Answer 21

All attach distally to posterior surface of calcaneus

all plantarflex the foot. Gastrocnemius flexes the knee

all innervated by the tibial nerve

Question 22

popliteus attachment

Answer 22

lateral surface of lateral condyle of femur, lateral meniscus

post surface of tibia superior to soleal line

Question 23

popliteus actions

Answer 23

weakly flexes leg at knee, medially rotates tibia if open chain (open chain = if foot is off the floor), laterally rotates femur if closed kinetic chain (unlock the knee)

Question 24

Popliteus innervation

Answer 24

tibial nerve

Question 25

Tibialis posterior attachment

Answer 25

posterior tibia inferior to soleal line, posterior interosseous membrane, posterior fibula navicular tuberosity, plantar aspect of medial cuneiform, cuboid, calcaneus, and bases of metatarsals 2-4

Question 26

Tibialis posterior actions

Answer 26

platarflexes and inverts foot (primary inverter of the foot)

Question 27

Tibialis posterior innervations

Answer 27

tibial nerve

Question 28

flexor hallucis longus

Answer 28

inferior 2/3 posterior surface of fibula and interosseus membrane base of 1st distal phalanx

Question 29

flexor hallucis longus action

Answer 29

flexes 1st digit (all joints), weakly plantarflexes foot

Question 30

flexor hallucis longus innervation

Answer 30

tibial nerve

Question 31

flexor digitorum longus attachment

Answer 31

medial part of posterior surface of tibia base of 2nd-5th distal phalanges

Question 32

flexor digitorum longus action

Answer 32

flexes lateral 4 digits, plantarflexes foot

Question 33

flexor digitorum longus innervation

Answer 33

tibial nerve