muscles OIA

Question 1

Tibialis anterior

Answer 1

O: lateral tibia, interosseous membrane and deep crural fascia

I: medial cuneiform, base of 1st met

N: deep peroneal

Function: Dorsiflex and invert, supinator

Question 2

EHL

Answer 2

O: ANterior surface of fibula
I: base of distal phalanx of 1st digit , w/ additional slip of insertion into base of 1st met
N: deep peroneal

F: Extension of 1st MPJ, dorsiflexion and supination

Question 3

Extensor hallucis capsularis

Answer 3

O: arise as extension of extensor hallucis longus tendon
I: capsule of 1st MPJ

F: lift capsule out of joint to prevent entrapment of capsule

Question 4

EDL

Answer 4

O: Lateral condyle of tibia, ant fib head and surface of fibula

I: extensor expansion of 2-5th digits

N: deep peroneal
F: extension of MPJ of four lateral digits
DOrsiflex and EVERT ankle, pronation

Question 5

Peroneus tertius

Answer 5

O: ant surface of fibula
I: base of 5th met
N: deep peroneal
F: dorsiflex and evert ankle

Question 6

Peroneus Longus

Answer 6

O: head and upper lat surface of fibula, laterla tibial condyle

I: lateral side of base of 1st met and lateral side of medial cuneiform

F: plantarflex and evert ankle, pronation

Question 7

peroneus brevis

Answer 7

O: lateral surface of fibula

I: styloid process of 5th met
A:plantarflex and evert ankle, pronation

Question 8

gastrocnemus

Answer 8

O: medial and lateral head: medail/lateral condyle

I: Central part of posterior surface of calcanues

N: plantarflex ankle, supinate, FLEX knee

Question 9

Soleus

Answer 9

O: posterior surface of head and body of fibula from soleal line. middle 2/3 tibia

I: calcaneus
N: tibial n
F: plantarflex ankle

Question 10

plantaris

Answer 10

O: lateral supracondylar line of femur and oblique popliteal lig

I: medial to achilles tendon
A: plantarflex ankle, flex knee

Question 11

Popliteus

Answer 11

O: lateral condyle of femur, arcuate popliteal ligament and lateral meniscus

I: proximal to soleal line on tibia 
A: flexor and rotator @ knee
UNLOCKS knee 
weight bearing: rotates thigh laterally 
nonweight bearing: rotates leg medially

Question 12

Psoas major O/I/A/ nerve

Answer 12

O: transverse processes of all lumbar vertebrae
I: apex of lesser trochanter
A: flex @ hip and flex lumbar spine

N: L2-L3

Question 13

Iliacus:

Answer 13

O: iliac fossa, iliac crest, ASIS, AIIS, superolateral portion of sacrum
I: base of lesser trochanter of femur

A: flexion @ hip

N: femur

Question 14

Gluteus maximus OIA/N

Answer 14

O: posterior gluteal line of ilium, posterior surface of sacrum and coccyx

I: superficial fibers–>IT BAND, deep fibers: gluteal tuberosity

A: extends, laterally rotate and ABduct thigh @ hip

N: inferior gluteal N

Question 15

gluteus medius

Answer 15

O: between posterior and anterior gluteal line
I: oblique bony ridge on greater trochanter

A:laterally and medially rotates extended hip, ABduct thigh

muscle stabilize pelvis during locomotion

N: superior gluteal N

Question 16

Gluteus minimus

Answer 16

O: between anterior and inferior gluteal line
I: anterior border of greater trochanter
A: ABductor of hip, medially rotate extended hip

stabilize pelvis during locomotion

Question 17

Tensor fascia latae

Answer 17

O: iliac crest, ASIS
I: lateral tibial condyle
A: hip flexor and medial rotator

N: superior gluteal n

Question 18

Piriformis

Answer 18

O: sacrum 1-4
I: superior border of greater trochanter

A: lateral rotator, abduct flexed hip, assist extension at hip

N: S1-S2, or just S2

Question 19

Obturator internus

Answer 19

O: superior and inferior pubic ramus, ischial ramus
I:medial surface of greater trochanter anterior to trochanteric fossa
A: lateral rotator, abduct flexed hip. extend hip

Question 20

Gemilli

Answer 20

O: outer surface of ischial spine(superior)
(inferior): upper part of ischial tuberosity
I: fusion with obturator internus into medial surface of greater trochanter
A: lateral rotator of hip

N:

inferior: n. quadraturs femoris
superior: n to obturator internus

Question 21

quadratus femoris

OIA/N, and what muscles is it between

Answer 21

between inferior gemmellus and upper fibers of adductor magnus

O: lateral edge of ischial tuberosity
I” quadrate tubercle of femur
n: L4-S1

A: ADducts and laterally rotate hip

Question 22

Obturator externus

Answer 22

O: ischium and pubis
I: trochanteric fossa of femur
A: ADDuct and laterally rotate hip (same as quad femoris)
N: POSTERIOR division of obturator nerve

Question 23

EDB OIA/ innervation

Answer 23

HAS ONLY 4 tendons!!!
O: tarsal sinus, interosseous talocalcaneal ligament, , frondiform ligament

I:
EHB: base of prox phalanx of 1st digit
EDB: lateral side (3 other tendons) of 2-4 of EDL

N: lateral terminal br of deep peroneal nerve

Question 24

abductor hallucis OIA/innervation

Answer 24

O: medial process of calcaneal tuberosity
I: medial side of the plantar surface of base of proximal phalanx of 1st digit (common with FHB)
some fibers may attach to tibial sesamoid

I: medial plantar nerve
Abduct 1st digit

Question 25

Flexor digitorum brevis

Answer 25

(lateral plantar vessels and nerves run deep to it) O: Medial process of calcaneal tuberosity I: middle phalanges of lateral 4 digits innervation: medial plantar nerve Function: flex PIPJ and MPJ

Question 26

abductor digit minimi abductor os metatarsi digiti minimi

Answer 26

O: lateral and medial process of calcaneal tuberosity and from depression of lateral and medial processes of calcaneal tuberosity and from the depression. I: lies in groove on plantar surface of 5th met/ inserts on lateral plantar side of base of proximal phalanx F: abduct and FLEX 5th digit I: lateral plantar nerve insertion for accessory: base of 5th met

Question 27

quadratus plantae what separates the head

Answer 27

long plantar ligament O: larger medial head arrises from medial process, lateral head from lateral process I: FDL A: accessory flexor to straighten the pull of long flexor Innervation: trunk of lateral plantar n

Question 28

2 tendons in 2nd layer 2 tendons in 4th

Answer 28

FHL and FDL:2nd layer 4th layer: peroneus longus tib posterior tendon

Question 29

Lumbricals

Answer 29

O: FDL 1st lumbrical originate from MEDIAL sidte of the most medial tendon only 2-4 arise from adjacent sides course SUPERFICIAL to deeptransverse metatarsal ligament I: inserts on medial surface of extensor expansion A: flex MPJ, extend IPJ innervation 1st lumbrical: medial plantar nerve 2-4: deep branch of lateral plantar nerve

Question 30

FHB

Answer 30

O: lateral head: cuboid and lateral cuneiform medial head: tendon of tibialis posterior I: medial head inserts on medial side of plantar surface of base of proximal phalanx (common with abductor hallucis) Lateral head: lateral side of of base of proximal phalanx) common with adductor hallucis A: flex 1st mpj I: medial plantar nerve

Question 31

Adductor hallucis opponens hallucis muscle

Answer 31

O: oblique head: base of 2-4 metatarsal and peroneus longus transverse head: plantar plates, metatarsophalangeal ligaments I: lateral side of base of prox phalanx of 1st digit A: adduct 1st toe innervation: deep branch of lateral plantar nerve opponens hallucis muscle may insert into 1st met

Question 32

FDMB

Answer 32

O: plantar surface of base of 5th met, peroneus longus I: plantar surface of prox phalanx of 5th dig with abductor digiti minimi F: flex and ABDUCT 5th digit I: superficial branch of lateral plantar nerve

Question 33

Plantar interossei

Answer 33

O: 3 plantar arise from base s and medial side of shaft of 3-5 met I: each insert on medial side of base of proximal phalanges I: deep branch of lateral plantar nerve: 1st and 2nd interrosei, superficial branch 3rd Function: ADDUCT 3-5 digits

Question 34

Dorsal interossei

Answer 34

BIPENNATE MUSCLES!!! O: arise from adjacentsides of met bones I: base of proximal phalanx 1st doral interosseous to the medial side of 2nd, 2nd to the lateral side of 2nd digit, 3rd to lat side fo 3rd 4th to lat side of 4th dig F: abductor I: all but 4th dorsal interossi by deep branch of deep branch of lateral plantar nerve 4th by superficial branch of lateral plantaer nerve