Shoulder Girdle

Question 1

Trapezius

Answer 1

Origin: * Nuchal ligament (ligamentum nuchae) * Spines of thoracic vertebrae * Occipital bone
Insertion: * Clavicle
* Acromion process
* Spine of scapula
Actions:
* Elevate scapula
* Adduction/retraction of scapula
* Upward rotation of the scapula, depression
*Shoulder shrug

Question 2

Levator Scapulae

Answer 2

Origin: * C1 – C4 transverse processes
Insertion: * Superior angle of scapula
Actions: * Scapula elevation
* elevates medial border of
scapula – shoulder shrug
with trapezius; downward
rotation of scapula

Question 3

Rhomboid Minor & Major

Answer 3

Origin: * Spinous processes of C7-T5
Insertion: * Medial border of scapula
*Rhomboid minor is superior to
major
Actions: * Retraction of scapula
* Elevation of scapula
* Downward rotation of scapula

Question 4

Serratus Anterior

Answer 4

Origin: * Lateral surface of ribs 1-9
Insertion: * Medial border of scapula,
anterior surface
Actions: * Abduction/protraction of scapula
* Upward rotation of scapula

Question 5

Pectoralis Minor

Answer 5

Origin: * Outer surface of ribs 2-5
Insertion: * Coracoid process of scapula
Actions: * Weak shoulder protraction
(serratus anterior is prime
mover)