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Anatomy s2
Ch 6.4
Ch 6
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Cards (6)
FACIAL MUSCLES
Frontalis
Skin of eyebrows
Raise eyebrows (surprise); wrinkle forehead
Orbicularis
oculi
Skin/muscle around the eyes
Closes eyes, squints, blinks, winks
Orbicularis
oris
Skin & muscle around mouth
Closes mouth and protrudes lips
Buccinator
Orbicularis oris
Compresses cheek, chews
Zygomaticus
Skin and muscle at corner of lips
Raises corners of mouth
CHEWING MUSCLES
Masseter
mandible
Close jaw/elevate platysma
Temporalis
mandible
Closes jaw, synergist of masseter
NECK MUSCLES
Platysma
Connective tissue, covering of superior chest muscles
Tissue around mouth
Tenses skin of neck
Sternocleidomastoid
Sternum & clavicle
Mastoid process
Flexes neck; laterally rotates head
Pectoralis
major
Proximal humerus
Adducts & flexes humerus
External
intercostal:
Raise rib cage (inhale)
Internal
intercostal:
Depress rib cage (exhale)
Muscles of the abdominal girdle
1.Rectus
abdominis:
flexes abdominal girdle
2.&
3.External
&
internal
oblique:
flexes vertebral column, bends trunk laterally
4.Transversus
abdominis:
compresses abdominal contents
Trapezius
Extend head (antagonist of sternocleidomastoid), elevate, depressed, adduct, & stabilize scapula
Latissimus
Dorsi
Lower spine & iliac crest, Proximal humerus
extends/adducts humerus (power stroke- swimming, striking blow)
Erector
Spinae
Iliac crests, ribs 3-12, & vertebrae Ribs, thoracic, & cervical vertebrae
Prime mover of back extension (erectors) provides resistance that helps control bending at the
waist
Quadratus
lumborum
Iliac crest lumbar fascia, upper lumbar vertebrae
Lateral spine flexion (forward bending), extension of lumbar spine
Deltoid
Scapular spine & clavicle, Humerus (deltoid tuberosity)
Injection site, prime movers of arm abduction