Muscle Functions ᕙ(•̀‸•́‶)ᕗ

Masseter

Elevates and protracts mandible

Digastric

Opens jaw when masseter/ temporalis are relaxed

Sternocleidomastoid

Laterally flexes neck from side to side

Rotates head

Pull head forward & down

Aid in forceful inhalation by elevating sternum & first ribs

Diaphragm

Contract & enlarges the volume of the thoracic cavity

Levator Scapulae

Elevates scapula

Erector Spinae

Extends vertebra to keep spine erect

Latissimus Dorsi

Extends shoulder

Adducts & rotates medially

Depresses & retracts shoulder

External Oblique

Compresses abdomen

Flexes & rotates vertebral column

Rectus Abdominis

Compresses abdomen

Flexes vertebral column

Trapezius

Rotates & retracts scapula

Superior portion elevates scapula

Inferior portion depresses scapula

Rhomboids

Retracts & elevates & rotates scapula

Pectoralis Major

Flexes shoulder

Adducts & rotates arm medially

Pectoralis Minor

Depresses & protracts scapula

Elevates ribs during forceful inhalation

Deltoid

Lateral portion abducts arm

Anterior portion flexes shoulder

Posterior portion extends shoulder

Supraspinatus

Abducts arm

Infraspinatus

Rotates arm laterally

Subscapularis

Rotates arm medially

Teres Minor

Rotates arm laterally

Biceps Brachii

Flexes elbow

Supinates forarm & hand

Brachioradialis

Flexes elbow

Triceps Brachii

Extends elbow

Flexor Carpi Ulnaris

Flexes wrist

Adducts hand

Palmaris Longus

Flexes wrist

Flexor Carpi Radialis

Flexes wrist

Abducts hand

Extensor Carpi Ulnaris

Extends wrist

Adducts hand

Extensor Digiti Minimi

Extension of 5th digit

Extensor Digitorum

Extends joints of fingers

Extensor Carpi Radialis

Extends wrist

Abducts hands

Gluteus Maximus

Extends hip

Tensor Fasciae Latae

Abducts thigh

Flexes hip

Rotates thigh medially

Adductor Longus

Adducts thigh

Flexes hip

Gracilis

Adducts thigh

Flexes knee

Sarto