LEA Quiz 5 Muscles (Anterior/Lateral Leg)

Question 1

Extensor Hallucis Longus Origin

Answer 1

Middle 1/2 of anteromedial aspect of middle fibular shaft and interosseous membrane (More DISTAL than TA and EDL)

Question 2

Extensor Hallucis Longus insertion

Answer 2

dorsal aspect of base of distal phalanx of 1st digit

Question 3

function of Extensor Hallucis Longus

Answer 3

extend/dorsiflex 1st digit

Question 4

Extensor Hallucis Capularis origin

Answer 4

medial aspect of EHL tendon or muscle (sometime TA)

Question 5

insertion of the Extensor Hallucis Capularis

Answer 5

dorsomedial aspect of 1st MPJ capsule

Question 6

function of Extensor Hallucis Capularis

Answer 6

tense capsule during extension preventing capsular impingement

Question 7

origin fibularis tertius

Answer 7

inferior 1/4 of medial (anterior) fibular shaft, interosseous membrane (sometimes EDL muscle)

Question 8

fibularis tertius insertion

Answer 8

dorsal aspect of base and shaft of 5th metatarsal

Question 9

function of fibularis tertius

Answer 9

dorsiflex foot and evert, subtalar pronation (passes anterior to lateral malleolus)

Question 10

fibularis brevis origin

Answer 10

distal 1/2 of lateral fibular shaft and crural fascia

• originates medial and inferior to fibularis longus
• anterior to fibularis longus as they pass around lateral malleolus

Question 11

fibularis brevis insertion

Answer 11

styloid process of 5th metatarsal

Question 12

function of fibularis brevis

Answer 12

eversion and plantarflexion (pronate subtalar joint)

Question 13

peroneus (fibularis) quartus origin

Answer 13

-the muscle belly of fibularis brevis or longus

or lateral shaft between origins of fibularis brevis and longus

Question 14

insertion of peroneus (fibularis) quartus

Answer 14

retrotrochlear eminence
cuboid
5th met base
other bones

Question 15

Tibialis Anterior origin

Answer 15

lateral tibial condyle, upper 2/3 lateral surface of tibil shaft, interosseous membrane, crural fascia

Question 16

tibialis anterior insertion

Answer 16

medial plantar surface of medial cuneiform, medial plantar surface of the 1st met base (metatarsal tubercle)

Question 17

function of tibialis anterior

Answer 17

dorsiflex and invert foot

supinate subtalar joint

Question 18

origin extensor digitorum longus

Answer 18

lateral tibial condyle, superior 3/4 of fibular shaft, anterior aspect of fibular head, interosseous membrane, crural fascia

Question 19

insertion extensor digitorum longus

Answer 19

tendon divides into 4 slips (digits 2-5) that insert on the dorsal surface of the bases of 2-5 middle and distal phalanges (contributes to extensor expansion over digits 2-5)

Question 20

function of extensor digitorum longus

Answer 20

digit (proximal and distal interphalangeal joints, metatarsalphalangeal joints) extension (dorsiflexion)
helps dorsiflex/evert (subtalar pronation)

Question 21

the inferior fibular retinaculum attaches

Answer 21

sinus tarsi

peroneal trochlea and lateral calcaneus

Question 22

superior fibular retinaculum attaches

Answer 22

-posteroinferior lateral malleolus and retrotrochlear eminence (creates pulley for tendons as they pass posterior to lateral malleolus)

Question 23

inferior extensor retinaculum frondiform ligament attachment

Answer 23

(stem) lateral talar neck, superior calcaneous within the sinus tarsi

Question 24

inferior extensor retinaculum oblique superomedial band attaches

Answer 24

anterior aspect of distal medial malleolus

Question 25

inferior extensor retinaculum oblique inferomedial band attaches

Answer 25

plantar aspect of medial cuneiform and navicular

Question 26

superior extensor retinaculum (transverse crural ligament) attaches

Answer 26

anterior aspect of the tibia and fibula distal shafts

Question 27

branches of superficial fibular nerve

Answer 27

medial dorsal cutaneous

intermediate dorsal cutaneous

Question 28

medial dorsal cutaneous nerve branches

Answer 28

proper dorsal digital nerve 1
1st common dorsal digital nerve
communicating branch to deep fibular

Question 29

1st common dorsal digital nerve (branch of medial dorsal cutaneous) branches

Answer 29

4th proper dorsal digital (dorsolateral 2nd toe)

5th proper dorsal digital (dorsomedial 3rd toe)

Question 30

proper dorsal digital nerve 1

Answer 30

dorsomedial hallux

Question 31

intermediate dorsal digital nerve (branch of medial dorsal digital) branches

Answer 31

2nd common dorsal digital nerve (3rd intermetatarsal space)

3rd common dorsal digital nerve (4th intermetatarsal space)

Question 32

2nd common dorsal digital nerve (3rd intermetatarsal space) branches

Answer 32

6th proper dorsal digital nerve (dorsolateral 3rd toe)

7th proper dorsal digital nerve (dorsomedial 4th toe)

Question 33

3rd common dorsal digital nerve (4th intermetatarsal space) branches

Answer 33

8th proper dorsal digital nerve (dorsolateral 4th toe)

9th proper dorsal digital nerve (dorsomedial 5th toe)

Question 34

fibularis longus origin

Answer 34

fibular head
proximal 1/2 of lateral fibular shaft
crural fascia

Question 35

fibularis longus insertion

Answer 35

lateral/plantar aspect of medial cuneiform and 1st metatarsal (tuberosity)

Question 36

fibularis longus function

Answer 36

eversion and plantarflex (pronate subtalar and midtarsal joints)
support 1st met during propulsion