muscles of axial skeleton

synergist

group of muscles working together

antagonist

group of muscles working in opposition

prime mover

strongest muscle in a group of synergists

epicranius

epicranius

raises eyebrows ad wrinkles forhead

obicularis oris

obicularis oris

closes and purses lips

obicularis oculi

obicularis oculi

closes eye

zygomatic major and minor

zygomatic major and minor

smiling

buccinator

buccinator

compresses cheek and holds food in while chewing

platysma

platysma

grimmace

corrugator superciili

corrugator supercilli

grumpy eyebrows

levator palpebrae

levator palpebrae

lifts eyelids

temporalis

temporalis

elevates and retract jaw and incisor biting

masseter

masseter

primary mover of jaw closure

sternocleidomastoid

sternocleidomastoid

flexion of head and rotation to opposite side

scalenes

scalenes

flex neck

pectoralis major

pectoralis major

adduction and medial rotation of arm

pectoralis minor

pectoralis minor

if standing up straignt, it draws scapula downward, also helps elevate ribs when breathing

serratus anterior

serratus anterior

boxer muscle, stabilized arm and shoulder

diaphragm

diaphragm

prime mover in breathing

external intercostals

internal intercostals

interostals

help inhale (external) and exhale (internal)

external obliques

external obliques

helps in trunk flexion

external oblique fiber direction

hands in pockets

internal oblique

internal obliques

help with flexion of trunk

internal oblique fiber direction

hands to chest

rectus abdominus

rectus abdominus

maintain posture and rotate spine

transverse abdominus

transverse abdominus

compresses abdominal contents

trapezius

trapezius

elevates rotates retracts and depresses scapula

latissimus dorsi

latissimus dorsi

movements of humerus

levator scapulae

levator scapulae

raises scapula

splenius capitus

splenius capitus

extend head and rotate neck

rhomboids

rhomboids

retract scapula

semispinalis capitus

semispinalis capitus

neck posture

erector spinae group

erector spinae group

extend back and neck

spinalis group

longissimus group

iliocostalis group