Muscles of the Shoulder Girdle

Question 1

Pectoralis Minor

O; I; A

Answer 1

O: Anterior surfaces of ribs 3 to 5.
I: Coracoid process of scapula.
A: Abduction/protraction, downward rotation and depression of scapula.

Question 2

Subclavius

O; I; A

Answer 2

O: Superior aspect of 1st rib at costal cartilage.
I: Inferior groove in midportion of clavicle.
A: Depression of scapula.

Question 3

Serratus Anterior

O; I; A

Answer 3

O: Surface of upper 9 ribs at side of chest.
I: Anterior aspect (on inside) of whole length medial border of scapula.
A: Abduction/protraction and upward rotation of scapula.

Question 4

Trapezius (Upper fibres)

O; I; A

Answer 4

O: Base of skull, occipital protuberance, posterior ligaments of neck.
I: Posterior aspect of lateral third of clavicle.
A: Elevation and upward rotation of scapula.

Question 5

Trapezius (Middle fibres)

O; I; A

Answer 5

O: Spinous processes of C7 and T1 to T3.
I: Medial border of acromion process and upper border of scapula spine.
A: Elevation, adduction and upward rotation of scapula.

Question 6

Trapezius (Lower fibres)

O; I; A

Answer 6

O: Spinous processes of T4 to T12
I: Triangular space at base of scapula spine
A: Depression, adduction and upward rotation of scapula.

Question 7

Rhomboids (Major and minor)

O; I; A

Answer 7

O: Spinous processes of C7 to T5.
I: Major, medial border of scapula below the spine (minor superior to major).
A: Adduction, elevation and downward rotation of scapula.

Question 8

Levator Scapulae

O; I; A

Answer 8

O: Transverse processes of C1 to C4.
I: Medial border of scapula from superior angle to scapula spine.
A: Elevation of scapula.