Ch9- shoulder girdle muscles Flashcards
posterior trunk muscles:
trapezius (most superifical), levator scapula, rhomboids
elevation
upper trap, levator scapula, rhomboids
levator scapula is prime mover in
scapular elevation
O- transverse processes of first four cervical vertebrae
levator scapula
muscles of shoulder girdle consists of :
trapezius, levator scapula, rhomboids, serratus anterior, and pectoralis minor
I- coracoid process of scapula
pectoralis minor
O- lateral surface of upper eight ribs
serratus anterior
downward (vertical) line of pull; assists: retraction; PM: depression and upward rotation
lower trapezius
I- outer third of clavicle, acromion process
upper trapezius
I- base of scapular spine
lower trapezius
A- scapular elevation and downward rotation
levator scapula
N- spinal accessory (cranial nerve XI), C3 and C4 sensory component
upper trapezius
horizontal line of pull outward
serratus anterior
A- scapular depression, protraction, downward rotation, tilt
pectoralis minor
I- vertebral border of scapula between the superior angle and spine
levator scapula
anterior trunk origin:
pectoralis minor
O- spinous processes of middle and lower thoracic vertebrae
lower trapezius
depression
lower traps, pec minor
N- long thoracic nerve (C5-7)
serratus anterior
downward (vertical) line of pull
pectoralis minor
“winging” of scapular occurs when this muscle is weakened or paralyzed
serratus anterior
the upper and lower trap is considered
assisting mover
N- dorsal scapular nerve (C5)
rhomboids