Muscle actions all for practical

Occipital frontalis frontal belly

Elevate eyebrows

Occipital frontalis occipital belly

Retract scalp

Occipital frontalis - galea aponeurotica

Facilitate scalp movement

orbicularis oculi

closes eye

Procerus

Wrinkles nose

levator palpebrae superioris

opens eye

Corrugator supercilli

furrows eyebrows

nasalis

flares nostrils

depressor septi nasi

constricts nostrils

orbicularis oris

closes lips

levator labii superioris

raises upper lip

zygomaticus major

elevates corner of mouth

zygomaticus minor

elevates upper lip

risorius

draws corner of lip laterally

modiolus

intersection of facial muscles

depressor anguli oris

depresses corner of mouth

depressor labii inferioris

depresses lower lip

mentalis

wrinkles chin

Buccinator

compresses cheek

platysma

tenses skin of neck

Temporalis

elevates and retracts mandible

masseter

elevates mandible

medial pterygoid

elevates mandible

lateral pterygoid

depresses mandible

digastic

Depresses mandible and elevates hyoid bone

geniohyoid

Depresses mandible and elevates hyoid bone

Mylohyoid

Depresses mandible and elevates hyoid bone

Stylohyoid

Depresses mandible and elevates hyoid bone

Omohyoid

depresses hyoid

Sternohyoid

depresses hyoid

Thyrohyoid

depresses hyoid

Sternothyroid

depresses hyoid

Sternocleidomastoid

flexes neck

Scalene group (anterior, posterior, medius)

flexes neck

Trapezius

extends neck

Splenius group (capitis and cervicis)

extends neck

Semispinalis Group (Capitis and Cervicis)

extends neck

Diaphragm

respiration

external intercostals

elevates ribs

internal intercostals

depresses ribs

external oblique

compresses abdomen

internal oblique

compresses abdomen

transverse abdominis

compresses abdomen

rectus abdominis

flexes vertebral column

linea alba

joins two halves of external oblique

linea semilunaris

division of the linea alba into two sheets of aponeurosis

rectus sheath

encloses the rectus abdominis

latissimus dorsi

extends and adducts humerus

erector spinae

back extension

illiocostalis

back extension

Longissimus

back extension

spinalis

back extension

piriformis

laterally rotates thigh

semispinalis thoracis

extension of vertebral column

Quadratus Lumborum

flexes the spine laterally

thoracolumbar fascia

Maintains stability in the lower back

Obturator internus

laterally rotates thigh

ischiocavernosus

maintains erection

Bulbospongiosus

empties urethra

deep transverse perineal

supports pelvic organs

external anal sphincter

controls defecation

levator ani

supports pelvic organs

pectoralis minor

protracts scapula

serratus anterior

protracts scapula

trapezius

retracts scapula

levator scapulae

elevates scapula

Rhomboid major

retracts scapula

Rhomboid minor

retracts scapula

Pectoralis major

flexes humerus

latissimus dorsi

extends humerus

deltoid

abducts arm

teres major

adducts arm

coracobrachialis

adducts arm

Supraspinatus

abducts arm

Infraspinatus

lateral rotation of arm

teres minor

lateral rotation at arm

Subscapularis

medially rotates arm

brachialis

flexes elbow

biceps brachii

flexes forearm

triceps brachii

extends forearm

brachioradialis

flexes elbow

pronator quadratus

pronates forearm

pronator teres

pronates forearm

supinator

supinates forearm

Flexor carpi radialis

flexes wrist

flexor carpi ulnaris

flexes wrist

flexor digitorum superficialis

flexes wrist

palmaris longus

flexes wrist

flexor retinaculum

protects tendons and nerves

flexor digitorum profundus

flexes fingers

flexor pollicis longus

flexes thumb

extensor carpi radialis longus

Extends wrist

extensor digitorum

extends fingers

extensor digiti minimi

extends pinky

extensor carpi ulnaris

extends wrist

abductor pollicis brevis

abducts thumb

opponens pollicis

opposition of thumb

adductor pollicis

adducts thumb

abductor digiti minimi

abducts pinky

iliacus

flexes thigh