chapter 12 shoulder girdle muscles Flashcards
the origin, insertion, action of upper trapezius
O: Occipital bone and nuchal ligament
I: Outer third of clavicle and acromion process
A: 1° scapular elevation, upward rotation
the origin, insertion, action of middle trapezius
O: Spinous process C7 - T3
I: Scapular spine
A: Scapular retraction
the origin, insertion, action of lower traps
O: Spinous processes of middle and lower thoracic vertebrae
I: Base of scapular spine
A: 1°Scapular depression, upward rotation
the origin, insertion, action of anterior serrates
O: Lateral surface of ribs 1-8
I: Vertebral border of scapula, anterior surface
A: Scapular protraction and upward rotation
(prevents winging)
the origin, insertion, action of elevator scapula
O: Transverse processes of C1-C4
I: Vertebral border of scapula between superior angle and spine
A: Scapular elevation and downward rotation
the origin, insertion, action of rhomboids
O: Spinous processes C7- T5
I: Vertebral border of scapula between spine and inferior angle
A: Scapular retraction, elevation, and downward rotation
the origin, insertion, action of Pectoralis minor
O: Anterior surface, ribs 3-5
I: Coracoid process of scapula
A: Scapular depression, protraction and downward rotation
what are the primer movers for retraction
Middle Trapezius
Rhomboids
what are the primer movers for protraction
Serratus Anterior
Pectoralis Minor
what are the primer movers for elevation
Upper Trapezius
Levator Scapula
Rhomboids
what are the primer movers for depression
Lower Trapezius
Pectoralis Minor
what are the primer movers for upward rotation
Upper Trapezius
Lower Trapezius
Serratus Anterior
what are the prime movers for downward rotation
pectoralis minor, rhomboids, levator scapula
what are the prime movers for scapular tilt
pectoralis minor
