Myology of the Shoulder Girdle

Question 1

Rhomboid Minor

Answer 1

O- Spinous processes of C7-T1
I- Upper medial border of spine across of spine of scapula
N- Dorsal scapula C4-5
A- Abduct scapula, elevate scapula, downwardly rotate scapula.

Question 2

Rhomboid Major

Answer 2

O- Spinous process of C7-T1
I- Medial border of scapula between spine of scapula and inferior angle.
N- Dorsal Scapula C4-C5
A- Abduct scapula, elevate scapula, downwardly rotate scapula.

Question 3

Serratus Anterior

Answer 3

O- External surfaces of upper 8/9 ribs
I- Anterior , medial border of scapula
N- Long Thoracic nerve C5-8
A- With origin (ribs) fixed: Abduct scapula, upwardly rotate scapula, depress scapula, holds medial border against rib cage.
Scapula fixed: Elevate thorax during inhalation