movement of muscle

Temporalis

elevates and retracts mandible

masseter

elevates and protracts mandible

zygomaticus major and minor

elevate and abduct corners of mouth when smiling

platysma

depresses lower lip as when making lizard face

sternocleidomastoid

if one contracts: rotation of the head

if both contract: flexes head and neck forward

pectoralis major and minor

adducts and flexes upper arm as when doong pushups or bench pressing

protracts scalpuae and shoulders

serratus anterior

rotates and protracts scalpula during various arm + shoulder movements. especially motions such as thrusting armforward such as boxing or push ups

external intercostals

elevate the rib cage for inspiration/inhalation

internal intercostals

draw ribs downwards and inwards to procude forceful expiration

rectus abdominus

flexes torso when doing sit ups + crunches

compresses abdomen when barfing

transverse abdominis

compresses abdomen when belching, barfing, and childbirth

external and internal obliques

rotates torso left and right and assists with flexion of torso

assists with compression of adbomen

trapezius

retracts and elevates scapula, extends neck

splenius capitis

extends, rotates, and laterally flexes the head and neck

rotator cuff

main function is to strengthen the joint capsule

rhomboids

retract and rotate scapula, when rowing

latissimus dorsi

adducts and extends upper arm

erector spinae

extends spinal column when you stand up straight after bending over

flexor carpi radialis

flexes and abducts wrist

flexor carpi radialis

flexes and adducts wrist

palmaris longus

flexes wrist

flexor digitorum superficialis

flexes fingers as when making a fist, also flexes wrist