Chapter 10 Muscles Flashcards
frontalis (frontal belly)
raises the eyebrows
orbicularis oculi
closes eyes, blinking
zygomaticus (major and minor)
smiling muscle
risorius
draws corner of lip laterally
orbicularis oris
closes lips, kissing,
buccinator
compresses cheek as in whistling and sucking
Mastication
chewing, 4 pairs of muscles involved, masseter and temporalis muscles are prime movers
masseter
prime mover of jaw closure
temporalis
closes jaw
sternocleidomastoid
major head flexors; flexes and laterally rotates the head
external intercostal muscles
considered inspiratory muscles; pull ribs toward one another to elevate rib cage
diaphragm
most important muscle of inspiration; prime mover of inspiration
internal intercostals
draws ribs together and depress rib cage
rectus abdominis
flex and rotate lumbar region of vertebral column
transversus abdominis
compresses abdominal contents