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Pharm 110 Muscle system > Muscle System > Flashcards

Muscle System Flashcards

1
Q

Epicranius (occipitofrontalis) frontal belly

A

Covers forehead and dome of skull – no bony attachments
O: epicranial aponeurosis
I: face skin eyebrows Fixes aponeurosis and raises eyebrows (surprise) – wrinkles forehead horizontally

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2
Q

Epicranius (occipitofrontalis) Occipital belly

A

By pulling on the epicranial aponeurosis it fixes the origin of the frontal belly
Fixes aponeurosis and pulls scalp posteriorly

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3
Q

Corrugator supercilia (wrinkle eyebrow)

A

Small muscle associated with Orbicularis oculi
O: frontal bone
I: skin of eyebrow
Draws eyebrows medially and inferiorly angry eyebrows

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4
Q

Orbicularis oculi

A

Thin, flat muscle around eyelid
O: frontal and maxillary bones
I: skin of eyelids
Closes eye- blinking and squinting

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5
Q

Orbicularis oris

A

Complicated multilayer muscle that runs in many directions around the mouth
O: maxilla and mandible
I: skin of mouth
Closes lips: kissing and whistling

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6
Q

Zygomaticus

A

Major and minor – pair that extend from cheekbone to corner of mouth
O: zygomatic bone
I: skin of mouth
Raises lateral side of mouth - smiling

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7
Q

Risorius (laughter)

A

Razor like slender muscle inferior and lateral to Zygomaticus
O: masseter
I: skin of mouth
Draws corner of lips laterally – synergist to Zygomaticus

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8
Q

Levator labii superioris (raise lip above)

A

Thin muscle between Orbicularis oris and inferior eye margin
O: zygomatic bone and maxilla
I: upper lip
Opens lips

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9
Q

Depressor labii inferioris

A

Small
O: mandible
I: lower lip
Draws lower lip inferiorly - pout

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10
Q

Depressor anguli oris

A

Small muscle lateral to Depressor labii inferioris
O: mandible
I: skin mouth
Draws corners of mouth down (grimace) antagonist to Zygomaticus

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11
Q

Mentalis (chin)

A

Muscle pair forming V shaped mass on chin
O: mandible
I: skin of chin
Wrinkles chin; pout

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12
Q

Buccinator

A

Thin horizontal cheek muscle deep to masseter
O: maxilla and mandible
I: Orbicularis oris
Compresses cheek – whistling sucking keeps food in mouth

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13
Q

Platysma

A

Thin superficial neck muscle role in facial expression
O: chest
I: mandible and skin of mouth
Tenses skin of neck and depress mandible

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14
Q

Masseter (chewer)

A

Powerful muscle covers the lateral part of the mandibular ramus
O: zygomatic bone
I: mandible
Prime mover of jaw closure – elevates mandible

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15
Q

Temporalis

A

Fan shaped; covers the temporal, parietal, and frontal bones
O: temporal bone
I: mandible
Closes jaw or bite down

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16
Q

Medial pterygoid

A

Deep 2-headed muscle runs along internal surface of mandible
O: sphenoid bone and maxilla
I: medial surface of mandible
Acts with lateral pterygoid to protract mandible and side to side grinding

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17
Q

Lateral pterygoid

A

Deep 2-headed muscle that runs superior to medial pterygoid
O: sphenoid bone
I: mandible
protract mandible and side to side grinding

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18
Q

Genioglossus (chin tongue)

A

Fan shaped muscle that forms bulk of the inferior tongue – attachment to the mandible prevents the tongue from falling back into the throat and prevent breathing
O: mandible
I: hyoid bone
Protracts tongue – sticking out tongue

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19
Q

Hyoglossus (hyo = hyoid bone)

A

Flat quadrilateral
O: hyoid bone

Depresses tongue

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20
Q

Styloglossus

A

(stylo=styloid process)
O: styloid process of temporal bone
Retracts and elevates tongue

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21
Q

Digastric

A 
Suprahyoid 
2 bellies united by intermediate tendon form V shape under chin 	
O: mandible and temporal bone 
I: hyoid bone 	
Open mouth and depress mandible
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22
Q

Stylohyoid

A 
suprahyoid 
Parallels posterior belly of digastric 	
O: styloid process of temporal bone
I: hyoid bone 	
Elevates and retracts hyoid
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23
Q

Mylohyoid (molar)

A 
suprahyoid 
Deep to digastric muscle – muscle pair forms floor of the anterior mouth 	
O: mandible 
I: hyoid bone 
Elevates hyoid bone and floor of mouth
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24
Q

Geniohyoid (chin)

A 
suprahyoid 
Deep to mylohyoid muscle 	
O: mandible
I: hyoid bone	
Pulls hyoid bone superiorly and anteriorly
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25
Q

Sternohyoid

A

infrahyoid
Most medial muscle of the neck thin and superficial except inferiorly where covered by sternocleidomastoid
O: manubrium and clavicle
I: hyoid bone
Depresses hyoid bone and larynx if the mandible is fixed

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26
Q

Sternothyroid

A 
infrahyoid 
Lateral and deep to Sternohyoid	
O: manubrium
I: thyroid cartilage	
Depresses larynx and hyoid bone
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27
Q

Omohyoid (omo=shoulder)

A 
infrahyoid 
2 bellies united by intermediate tendon lateral to Sternohyoid	
O: scapula
I: hyoid bone	
Depresses and retracts hyoid bone
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28
Q

Thyrohyoid

A 
infrahyoid 
Superior continuation of Sternothyroid	
O: thyroid cartilage
I: hyoid bone 	
Depresses hyoid bone and elevates larynx if the hyoid is fixed
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29
Q

Superior middle and inferior pharyngeal constrictor muscles

A 
pharyngeal constrictor muscle 
3 paired muscle whose fibers run circularly in pharynx wall; superior is innermost and inferior is outermost substantial overlap 	
O: mandible, hyoid bone, larynx
I: pharynx 	
Constrict pharynx during swallowing
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30
Q

Sternocleidomastoid

A

anterolateral neck
2 headed muscle; deep to platysma
O: manubrium and clavicle
I: temporal bone (mastoid process) occipital bone Flexes and laterally rotates head

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31
Q

Scalenes – anterior middle and posterior

A 
anterolateral neck 
Lateral on neck; deep to platysma and SCM	
O: cervical vertebrae
I: first 2 ribs 	
Elevate 1st 2 ribs – forced inspiration
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32
Q

Splenius (bandage, head, neck)

A

intrinsic muscle of the back
Capitus and cervicis portions
Broad bipartite superficial muscle capitus is bandage muscle because it covers and holds down deeper neck muscles
O: ligamentum nuchae; vertebrae C7-T6
I: mastoid process of temporal bone and occipital bone (capitus) and C2-C4 (cervicis)
Extend or hyperextend head – pulls to same side

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33
Q

Erector spinae

A

Prime mover of back extension; during full flexion the erector spinae are relaxed (fingers touching the floor) when reversing this movement these muscles are initially inactive – extension initiated by hamstring and gluteus max

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34
Q

erector spinae - Iliocostalis (ilium, rib, thorax)

A

Lumborum, thoracis, cervicis – most lateral group of ES
O: iliac crest (lumborum); ribs (thoracis and cervicis)
I: ribs (lumborum and thoracis) cervical vertebrae (cervicis)
Extend and laterally flex the vertebral column

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35
Q

erector spinae - Longissimus (longest)

A

Thoracis, cervicis and capitis – intermediate
O: lumbar -cervical vertebrae
I: thoracic and cervical certebrae, ribs and the capitis inserts into the temporal bone
Extend and laterally flex the vertebral column; extends head and turn face to same side (dif capitis bc inserts in temporal bone)

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36
Q

erector spinae - Spinalis

A

Thoracis and cervicis – medial
O: lumbar and thoracic vertebrae
I: thoracic and cervical vertebrae (move up)
Extends vertebral column

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37
Q

Semispinalis

A

intrinsic back muscle
Thoracis, cervicis and capitis – deep layer
O: C7-T12
I: occipital bone (capitis) cervical vertebrae (cervicis) and thoracic vertebrae (thoracis)
Extends vertebral column and head and rotates them to opposite direction

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38
Q

Quadratus lumborum

A 
intrinsic back muscle 
Deeper- posterior abdominal wall 	
O: iliac crest 
I: lumbar vertebrae 	
Laterally flexes vertebral column and forced inspiration – pull down abdominal wall
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39
Q

External intercostals

A

thorax muscles - breathing
O: rib
Pull ribs toward each other to lift rib cage

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40
Q

Internal intercostals

A

thorax muscle - breathing
O: rib
Brings ribs together and depresses rib cage – forced expiration

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41
Q

Diaphragm

A

thorax muscle - breathing
Floor of thoracic cavity, dome shaped when relaxed key muscle for inspiration
O: rib cage, sternum and costal cartilages
I: central tendon
Prime mover of inspiration – flattens on contraction pulls down thoracic cavity and brings air in

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42
Q

External obliques

A

anterior and lateral abdominal wall
Largest and most superficial, runs downward and medially (hands in pocket) forming inguinal ligament O: ribs
I: linea alba and iliac crest
Flex vertebral column and compress abdominal wall
Rotating trunk and flexing laterally (individually)

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43
Q

Internal obliques

A

anterior and lateral abdominal wall
Fibers runs upward and medially
O: lumbar, iliac crest
I: linea alba, pubic crest, ribs
Flex vertebral column and compress abdominal wall
Rotating trunk and flexing laterally (individually) same as above

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44
Q

Rectus abdominus

A 
anterior and lateral abdominal wall
Medial superficial 	
O: pubic crest 
I: xiphoid process and ribs 	
Flex and rotate lumbar region of vertebral column
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45
Q

Transversus abdominus

A 
anterior and lateral abdominal wall 
Deepest and fibers fun horizontally 	
O: lumbar
I: linea alba, pubic crest	
Compresses abdominal contents
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46
Q

Levator ani (raises anus)

A

pelvic diaphragm
Broad tripartite - pubococcygeus, puborectalis, iliococcygeus forms a muscular sling
O: inside pelvis
Supports and maintains positions of pelvic organs

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47
Q

Coccygeus

A

pelvic diaphragm
Small triangular muscle
O: pelvis
Supports pelvic organs

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48
Q

External urethral sphincter (squeeze)

A

urogenital diaphragm inferior to pelvic diaphragm

Muscle circling the urethra and vagina Constricts urethra

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49
Q

Deep transverse perineal muscle

A

Supports pelvic organs

urogenital diaphragm inferior to pelvic diaphragm

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50
Q

Ischiocavernosus

A

superficial perineal space
Pelvis to base of penis or clit
Maintains erection of penis or vagina stops venous drainage

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51
Q

Bulbospongiosus

A

Encloses base of penis
Empties male urethra
superficial perineal space

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52
Q

Superficial transverse perineal muscles

A

Posterior to urethral opening
Stabilizes and strengthens the central tendon of perineum
superficial perineal space

53
Q

Pectoralis minor

A 
superficial muscles of anterior thorax 
Beneath pectoralis major	
O: ribs 3-5
I: scapula	
Brings scapula forward and downward
54
Q

Serratus anterior

A

superficial muscles of the anterior thorax
O: ribs 1-8
I: scapula
Rotates scapula so the inferior angle moves upward and lateral

55
Q

Subclavius

A

superficial muscles of the anterior thorax
O: costal cartilage
I: clavicle
Stabilize and depress pectoral (shoulder) girdle

56
Q

Trapezius

A

superficial muscles of the posterior thorax
Most superficial
O: occipital bone, C7 and thoracic vertebrae
I: scapula and clavicle
Stabilizes, elevates, rotates and retracts scapula

57
Q

Levator scapulae

A 
superficial muscles of the posterior thorax 
Deep to trapezius	
O: C1-C4
I: scapula  	
Elevates and adducts scapula
58
Q

Rhomboids

A

superficial muscles of the posterior thorax
Major and minor (superior); deep to trapezius and inferior to levator scapulae
O: C7 and T1 and T2-T5
I: scapula
Stabilize scapula

59
Q

Pectoralis major

A

cross the shoulder joint moving the humerus
O: clavicle, sternum, ribs 1-6 and external obliques
I: humerus
Adducts and medially rotates arm;
clavicular part: assists in flexion when arm is extended
Sternal part: assists in extension when arm is flexed

60
Q

Deltoid

A

cross shoulder joint move humerus
Multipennate
O: clavicle and scapula
I: humerus
Prime mover of arm abduction (all fibers active) antagonize pec maj and LD
Anterior fibers active: flexing and rotating arm medially – synergist to pec maj
Posterior fibers active: extension and lateral rotation of arm

61
Q

Latissimus dorsi

A

cross shoulder joint move humerus
Broad flat
O: thoracic and lumbar vertebrae, ribs 3-4, iliac crest, scapula
I: humerus
Prime mover of arm extension and adduction; medially rotates arm at shoulder

62
Q

Subscapularis (RC)

A

cross shoulder joint move humerus
O: scapula
I: humerus
Medial rotator of arm; stabilize shoulder joint and assisted by pec major

63
Q

Supraspinatus (RC)

A 
cross shoulder joint move humerus 
Posterior scapula deep to trapezius 	
O: scapula
I: humerus 	
Initiates abduction of arm, stabilizes shoulder joint
64
Q

Infraspinatus

A 
cross shoulder joint move humerus 
Covered by deltoid and trapezius 	
O: scapula
I: humerus	
Rotates arm laterally; stabilizes shoulder joint
65
Q

Teres minor

A 
cross shoulder joint move humerus 
Inferior to Infraspinatus	
O: scapula
I: humerus	
Rotates arm laterally; stabilizes shoulder joint same as infraspintus
66
Q

Teres major (synergist)

A 
cross shoulder joint move humerus 
Inferior to teres minor 	
O: scapula
I: humerus	
Extends, medially rotates and adducts arm synergist of latissimus dorsi
67
Q

Coracobrachialis (Synergist)

A

cross shoulder joint move humerus
O: scapula
I: humerus
Flexes and adducts arm

68
Q

Triceps brachii

A 
posterior elbow joint muscle 
3 headed origin long and lateral heads superficial to medial head	
O: 
long head: scapula; 
lateral head: humerus
Medial head: humerus 
I: ulna	
Forearm extensor (prime mover by medial head) long and lateral heads active in extending the arm against resistance
69
Q

Anconeus

A

posterior muscles of the elbow joint
O: humerus
I: ulna
Ulnar abduction during pronation stabilize arm joint

70
Q

Biceps brachii

A 
anterior muscle crossing elbow joint 
2 headed origin short head and long head cross shoulder and elbow joint	
O: scapula
I: radius  	
Flexes and supinates arm
71
Q

Brachialis

A

anterior muscles crossing the elbow joint
Deep to bicep on distal humerus
O: humerus
I: ulna
Forearm flexor – lifts ulna as bicep lifts radius

72
Q

Brachioradialis

A 
anterior muscle crossing the elbow joint 
Superficial and lateral 	
O: humerus
I: radius	 
Synergist in flexing forearm
73
Q

Pronator teres

A 
anterior superficial muscle of the forearm 
2 headed muscle	
O: humerus and ulna
I: radius  	
Pronates forearm
74
Q

Flexor carpi radialis

A

anterior superficial muscle of the forearm
O: humerus
I: metacarpals Flexor and abductor of hand

75
Q

Palmaris longus

A

anterior superficial muscle of forearm
O: humerus
I: palmaris aponeurosis
Tenses skin of palm during hand movements

76
Q

Flexor carpi ulnaris

A 
anterior superficial muscle of forearm 
Most medial, 2 headed	
O: humerus and ulna
I: metacarpal	
Flexor and adductor of hand
77
Q

Flexor digitorum superficialias

A

anterior superficial muscle of the forearm
2 headed muscle – more deep
O: humerus, ulna, radius
I: fingers 2-5 not thumb
Flexes wrist and middle phalanges of fingers 2-5 (fingers curl towards palm)

78
Q

Flexor pollicis longus

A

anterior deep muscle of the forearm
O: radius
I: thumb
Flexes distal phalange of thumb

79
Q

Flexor digitorum profundus

A

anterior deep muscle of forearm
O: ulna
I: 2-5 fingers
Flexes distal interphalangeal joints

80
Q

Pronator quadratus

A 
anterior deep muscle of the forearm 
Deepest muscle 	
O: ulna
I: radius  	
Prime mover of forearm protonation
81
Q

Extensor carpi radialis longus

A

superficial muscle of posterior forearm
Parallels brachioradialis on lateral forearm O: humerus
I: metacarpals Extends and abducts hand

82
Q

Extensor carpi radialis brevis

A 
superficial posterior muscle of forearm 
Shorter than longus and deeper	
O: humerus
I: metacarpal  	 
Extends and abducts hand
83
Q

Extensor digitorum

A 
superficial posterior muscle of forearm 
Medial to extensor carpi radialis brevis
Extensor digiti minimi	
O: humerus 
I: 2-5 fingers 	
Prime mover of finger extension – counteracts flexor
84
Q

Extensor carpi ulnaris

A 
superficial posterior muscle of forearm 
Most medial 	
O: humerus, ulna 
I: metacarpals 	
Extends and adducts hand
85
Q

Supinator

A

deep posterior muscle of forearm
Deep muscle at posterior aspect of elbow
O: humerus and ulna
I: radius
Assists bicep in forcibly supinating forearm

86
Q

Abductor pollicis longus

A 
deep muscle of posterior forearm 
Distal to supinator  	
O: radius and ulna
I: first metacarpal	
Extends and abducts thumb
87
Q

Extensor pollicis brevis and longus

A 
deep posterior of forearm 
Shorter than longus and deeper	
O: radius and ulna
I: thumb	 
Extends thumb
88
Q

Extensor indices

A 
deep muscle of posterior forearm 
Medial to extensor pollicis brevis and longus 
Extensor digiti minimi	
O: ulna
I: index finger  	
Extends index finger
89
Q

Iliopsoas

A

anterior and medial crossing hip joint
Combo of iliacus and psoas major that combine in a common tendon
O: humerus and ulna
I: radius
Assists bicep in forcibly supinating forearm
iliacus and psoas major

90
Q

• Iliacus

A

anterior and medial muscle crossing the hip joint Large more lateral
O: iliac fossa and crest
I: femur
Prime mover for flexing thigh or flexing trunk onto thigh

91
Q

• Psoas major (loin large)

A

anterior and medial muscles crossing the hip joint
Longer thicker more medial
O: lumbar vertebrae and T12
I: femur via iliopsoas tendon
Prime mover for flexing thigh or flexing trunk onto thigh and flexes vertebral column laterally

92
Q

Sartorius

A

anterior and medial muscle crossing the hip joint
Longest muscle in body
O: iliac spine
I: tibia
Flexes, abducts and laterally rotates thigh

93
Q

Gluteus maximus

A 
posterior pelvic muscle 
Largest and most superficial    	
O: dorsal ilium, sacrum, coccyx 
I: femur, iliotibial tract	
Extensor of thigh, most effective when thigh is flexed
94
Q

Gluteus medius

A 
posterior pelvic muscle 
 Intramuscular injections   	
O: ilium
I: femur	
Abducts and medially rotates thigh; walking - holds pelvis so doesn’t sag
95
Q

Gluteus minimus

A 
posterior pelvic muscles 
Smallest and deepest 	
O: ilium
I: femur 	 
Abducts and medially rotates thigh; walking - holds pelvis so doesn’t sag
96
Q

Piriformis

A 
lateral rotators 
Inferior to gluteus minimus     	
O: sacrum 
I: femur 	
Rotates extended thigh laterally and helps adduct thigh
97
Q

Obturator externus

A 
lateral rotator 
Superomedial aspect of thigh 	
O: obturator foramen 
I: femur	
Rotates extended thigh laterally and helps adduct thigh
98
Q

Obturator internus

A 
lateral rotator 
Surrounds obturator foramen in pelvis  	
O: obturator foramen
I: greater trochanter	
Rotates extended thigh laterally and helps adduct thigh
99
Q

Gemellus

A 
lateral rotator 
Superior and inferior 	
O: ischial spine
I: femur 	
Rotates extended thigh laterally and helps adduct thigh
100
Q

Quadratus femoris

A

lateral rotator
Most inferior
I: femur
Rotates thigh laterally NO extension

101
Q

Quadriceps femoris

A

4 separate heads with common insertion tendon (quadriceps tendon) inserts into patella then via patellar ligament into tibial tuberosity
anterior thigh

102
Q

quadriceps femoris - • Rectus femoris

A 
anterior thigh 
Superficial 	
O: iliac spine 
I: patella and tibial tuberosity 	
Extends leg and flexes thigh at hip
103
Q

quadriceps femoris - Vastus lateralis

A 
Largest head  	
O: linea aspera femur
I: patella and tibial tuberosity	
Extends leg and stabilizes leg  
anterior thigh
104
Q

quadriceps femoris - Vastus medialis

A 
anterior thigh 
Inferomedial aspect of thigh  	
O: linea aspera femur
I: patella and tibial tuberosity	
Extends leg  no hip flexion bc only cross knee joint not hip joint
105
Q

quadriceps femoris - Vastus intermedius

A 
anterior thigh 
Intermediate 	
O: femur shaft  
I: patella and tibial tuberosity	
Extends leg
106
Q

Tensor fascia lata

A

anterior thigh
O: iliac crest
I: iliotibial tract (thick lateral portion or fascia lata) Steadies leg and trunk on thigh by making iliotibial tract taut

107
Q

Hamstrings

A

posterior thigh - Cross both hip and knee joints; prime movers of thigh extension and knee flexion innervated by sciatic nerve

108
Q

hamstrings- Biceps femoris

A 
posterior thigh 
Most lateral; 2 heads 	
O: ischial tuberosity (long head) 
Femur (short head) 
I: fibula and tibia  	
Extends thigh and flexes leg
109
Q

hamstrings - Semitendinosus

A 
posterior thigh 
Mostly tendinous   	
O: ischial tuberosity
I: tibia 	
Extends thigh and flexes leg
110
Q

hamstring - Semimembranosus

A 
posterior thigh 
Deep to semitendinosus   	
O: ischial tuberosity
I: tibia	
Extends thigh and flexes leg
111
Q

Adductor magnus

A

medial thigh
O: ischial and pubic rami
I: femur
Adducts, medially rotates, flexes and extends thigh (synergist of hamstrings)

112
Q

Adductor longus

A 
medial thigh 
Most anterior  	
O: pubis 
I: linea aspera (femur)	
Adducts, flexes and medially rotates thigh
113
Q

• Adductor brevis

A 
medial thigh 
Deep to semitendinosus   	
O: pubic ramus 
I: linea aspera (femur)	
Adducts, flexes and medially rotates thigh
114
Q

Pectineus

A

medial thigh
O: pubis
I: femur
Adducts, flexes and medially rotates thigh

115
Q

Gracilis

A 
medial thigh 
Long thin superficial 	
O: pubis
I: tibia 	
Adducts, flexes and medially rotates leg – crosses knee joint too
116
Q

Tibialis anterior

A 
anterior calf 
Superficial 	
O: tibia 
I: first metatarsal bone (big toe) 	
Prime mover of dorsiflexion and inverts foot
117
Q

Extensor digitorum longus

A 
anterior calf 
Unipennate muscle   	
O: tibia and fibula 
I: 2-5 toes 	
Primary mover of toe extension; dorsiflexes foot
118
Q

Fibularis tertius

A 
anterior calf 
Not always present    	
O: fibula 
I: 5th metatarsal 	
Dorsiflexes and everts foot
119
Q

Extensor hallucis longus

A 
anterior calf 
Deepest 	
O: fibula
I: big toe 	
Extends great toe; dorsiflexes foot
120
Q

Fibularis longus

A 
lateral calf 
Superficial, lateral 	
O: fibula
I: first metatarsal bone (big toe) 	
Plantar flexion and everts foot
121
Q

Fibularis brevis

A 
lateral calf 
Deep    	
O: fibula 
I: 5th metatarsal  
Plantar flexion and everts foot
122
Q

Triceps surae - Gastrocnemius

A 
superficial posterior calf 
2 prominent bellies	
O: 2 heads from femur
I: calcaneus  	
Plantar flexion and flexes knee (weak at knee joint)
123
Q

Triceps surae - Soleus

A 
superficial posterior calf 
Deeper 	
O: tibia and fibula
I: gastrocnemius 	
Plantar flexes foot, walking, running, dancing
124
Q

Plantaris

A 
superficial posterior calf 
Small, may be absent	
O: femur
I: calcaneus	
Flex leg and plantar flex foot
125
Q

Popliteus

A 
deep posterior calf 
Inferomedial 	
O: femur 
I: tibia	
Flexes and rotates leg medially
126
Q

Flexor digitorum longus

A

deep posterior calf
O: tibia
I: 2-5 toes
Plantar flexion and inverts foot, flexes toes

127
Q

Flexor hallucis longus

A 
deep posterior calf 
bipennate	
O: fibula
I: big toe 	
Plantar flexion and inverts foot, flexes big toe
128
Q

Tibialis posterior

A 
deep posterior calf 
Deep to soleus 	
O: tibia fibula 
I: metatarsals 2-4 	
Prime mover of foot inversion; plantar flexes

Pharm 110 Muscle system (1 decks)

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