Actions of Muscles Flashcards
(55 cards)
frontalis ( epicranius frontal )
action: raises eyebrows
orbicularis oculi
action: closes eyes
zygomaticus
action: smiling muscle
orbicularis oris
action: purses lips “ kissing muscle “
massester
action: closes jaw “ chewing muscle “
sternocleidomastoid
action: cervical rotation and lateral flexion
platysma
action: tenses skin of neck
sternohyoid
action: depresses hyoid
pectoralis major
action: ADDucts shoulder
pectoralis minor
action: draws scapula forward
serratus anterior
action: draws scapula forward “ boxing muscle “
external intercostal
action: elevates rib cage, aids inspiration
internal intercostal
action: decreases rib cage, aids expiration
external oblique
action: flexes and rotates trunk
internal oblique
action: flexes and rotates trunk
transverse abdominis
action: compresses abdominal contents
rectus abdominis
action: flexes trunk, compresses abdomen
trapezius ( upper, middle, lower )
action: elevates, depresses, retracts scapular, extends c-spine
latissimus dorsi
action: ADDucts shoulder
erector spinae
action: extends vertebral column
deltoid
action: flex, ABDucts, or extends shoulder
rhomboids ( minor & major )
action: pulls scapulae medially
supraspinatus
action: synergist with deltoid, stabilizes shoulder
infraspinatus
action: rotates humerus laterally, stabilizes shoulder
