Lab Exam #3 Actions Flashcards
Action of Frontalis
Raises the eyebrows
Action of Orbicularis Oculi
Closes the eye
Action of Zygomaticus
“smiling muscle”
Action of Orbicularis Oris
purses lips “kissing muscle”
Action of Masseter
closes jaw “chewing muscle”
Action of Sternocleidomastoid
cervical rotation and lateral flexion
Action of Platysma
tenses skin of neck
Action of Sternohyoid
depresses hyoid
Action of Pectoralis Major
adducts shoulder
Action of Pectoralis Minor
draws scapula forward
Action of Serratus anterior
draws scapula forward “boxing muscle”
Action of External intercostals
elevates rib cage aids inspiration
Action of Internal intercostals
depresses rib cage aids expiration
Action of External Oblique
flexes and rotates trunk
Action of Internal Oblique
flexes and rotates trunk
Action of Transverse Abdominis
compresses abdominal contents
Action of rectus abdominis
flexes trunk, compresses abdomen
Action of Trapezius (upper, middle, lower)
elevates, depresses, retracts scapular, extends c-spine
Action of Latissimus Dorsi
Adducts shoulder
Action of Errector Spinae
extends vertebral column
Action of Deltoid
flexes, abduct, or extend shoulder
Action of Rhomboids
pulls scapulae medially
Action of Supraspinatus
synergist with deltoid, stabilizes shoulder
Action of Infraspinatus
rotates humerus laterally, stabilizes shoulder
