Lab 5 - Muscles of the Body Flashcards
Frontalis
action = raise eyebrows
fibers run up and down on forehead (frontal bone)
Orbicularis Oculi
action = close eye (blink)
around eye
Orbicularis Oris
action = purse lips
around mouth
Masseter
action = elevate mandible (close jaw)
broad band on side of jaw
-connects upper and lower jaw
Diaphragm
action = inhalation
sheet of muscle at bottom of thorax
-parachute shaped
Intercostal Muscles
action = inhalation and exhalation
between ribs
Rectus Abdominis
action = flex trunk
lateral to midline of abdomen
-“six-pack” (“abs”)
External Oblique
lateral portion of abdomen
-diagonal striations/fibers
Trapezius
action = elevate scapula (shrug shoulder)
upper-back muscle
-runs along vertebral column and inserts on scapula
Latissimus Dorsi
lower back muscle
-inserts on arm/humerous
-“swimmer’s muscle”
Serratus Anterior
“boxer’s muscle” looks like serrations points oriented anteriorly
Deltoid
action = abduct shoulder
triangular shoulder muscle
Pectoralis Major
action = adduct shoulder
chest muscle inserts on arm/humerus (“pecs”)
Triceps Brachii
action = extend elbow
posterior arm muscle (“triceps”)
Biceps Brachii
action = flex elbow
anterior arm muscle (“biceps”)
