Action Flashcards
Frontal belly of occipitofrontalis
Moves scalp, wrinkles forehead, elevates eyebrows
Occipital belly of occipitofrontalis
Moves scalp slightly posterior (wiggle ears)
Orbicularis oris
Closes lips, puckers lips
Platysma
Pulls lower lip inferiorly, tenses skin of neck and contributes to depression of mandible
Buccinator
Compresses cheek, holds food between teeth during chewing, aids in sucking and blowing
Temporalis
Elevates and retracts mandible
Masseter
Elevates and protracts mandible; prime mover of jaw closure
Medial and lateral pterygoid
Elevate and protract mandible and move it side to side during chewing
Sternocleidomastoid
Both: flexion of head and neck
One: turns head to opposite side of muscle contracting
Splenis capitus
Both: pulls head back, extends and hyperextends
One: turns head to same side
Semispinalis capitus
Both: pulls head back, extends and hyperextends
One: turns head to same side
External intercostals
Elevates ribs during inhalation (move up and out like bucket handle)
Internal intercostals
Depresses ribs during forced exhalation
Diaphragm
Moves inferiorly to expand thoracic cavity
External oblique
Both: compress abdomen, flex vertebral column
One: lateral flexion of vertebral column
Internal oblique
Both: compress abdomen, flex vertebral column
One: lateral flexion of vertebral column
Transverse abdominus
Compresses the abdomen
Rectus abdominus
Flexes vertebral column and compresses abdominal wall, forceful exhalation
Pectoralis minor
Protracts and depresses the scapula (hunch shoulders)
Serratus anterior
Prime mover that protracts and depresses scapula, stabilizes the scapula, and superiorly rotates scapula
Rhomboid major
Retracts and elevates scapula and inferiorly rotates scapula
Rhomboid minor
Retracts and elevates scapula and inferiorly rotates scapula
Trapezius
Elevates and retracts the scapula, draws head back
Latissimus Dorsi
Prime mover of arm extension and draws it downward and backward while rotating medially
Pectoralis major
Prime mover of arm flexion, also adducts and medially rotates arm
Deltoid
Anterior: flex and medially rotate arm
Middle: prime movers of abduction
Posterior: extend and laterally rotate arm
Coracobrachialis
Adductor and flexes arm
Teres major
extends and adducts arm at shoulder joint, drawing it down and back while rotation medially
Subscapularis
Medially rotates arm, wind up to pitch
Supraspinatus
Abducts the arm as when you start to execute pitch
Infraspinatus
Adductor and laterally rotates arm like slowing your arm down
Teres minor
Adductor and laterally rotates arm like slowing it down after pitch
Biceps brachii
Flexes elbow at joint and powerful supination
Triceps brachii
Primary extensor of elbow joint
Psoas major
Flexes thigh
Iliacus
Flexes thigh
Gracilis
Adductor and flexes thigh, flexes leg
Tensor fasciae latae
Abducts thigh and medially rotates thigh
Gluteus Maximus
Extends and rotates thigh laterally
Rectus femoris
Extends leg, flexes thigh
Vastus lateralis
Extends leg, flexes thigh
Vastus medialis
Extends leg
Vastus intermedius
Extends leg
Biceps femoris
Extends thigh(long head only), flexes knee, laterally rotates leg
Semimembranosus
Extends thigh and flexes knee, medially rotates leg
Semitendinosus
Extends thigh and flexes knee, medially rotates leg
Tibialis anterior
Dorsiflexes foot and inverts foot
Peroneus longus
Everts foot and a weak plantar flexor
Gastrocnemius
Flexes leg and plantar flexes foot
Soles
Plantar flexes foot
Sartorius
Flexes thigh and laterally rotates thigh, flexes leg and rotates it medially
