Muscles of Scapular movement

Question 1

O: External occipital protuberance , Superior nuchal line , Nuchal ligament , Spinous processes of C7-T12
I: Lateral third of the clavicle , Acromion process , Scapular spine

Answer 1

TRAPEZIUS (FIG. 21.31)
A: Extends the neck and head (upper fibers) , Elevates the scapula (upper fibers) , Upwardly rotates the scapula (upper fibers) , Retracts the scapula (middle fibers) , Depresses the scapula (lower fibers) , Laterally flexes the neck (unilateral contraction) , Rotates the head (unilateral contraction)
N: Spinal accessory nerve (cranial nerve XI) , Midcervical nerves

Question 2

O: Transverse processes of C1-C4
I: Medial border of the scapula (from superior angle to root of spine)

Answer 2

LEVATOR SCAPULAE (FIG. 21.32)
A: Elevates the scapula , Downwardly rotates the scapula , Laterally flexes the neck
N: Dorsal scapular nerve , Midcervical nerves

Question 3

O: Spinous processes of C7-T1 (minor) , Spinous processes of T2-T5 (major)
I: Medial border of the scapula below the superior angle to the root of the scapular spine (minor) , Medial border of the scapula from the root of the scapular spine to the inferior angle (major)

Answer 3

RHOMBOID MAJOR AND MINOR (SEE FIG. 21.32)
A: Retracts the scapula , Downwardly rotates the scapula , NERVE , Dorsal scapular nerve

Question 4

O: Ribs 1 through 8 or 9 (lateral to costal cartilage exterior surface of the ribs)
I: Medial border of the scapula (anterior aspect)

Answer 4

SERRATUS ANTERIOR (FIG. 21.33)
A: Protracts the scapula , Upwardly rotates the scapula , Depresses the scapula
N: Long thoracic nerve

Question 5

O: Ribs 3 through 5 (lateral to costal cartilage)
I: Coracoid process of the scapula

Answer 5

PECTORALIS MINOR (FIG. 21.34)
A: Depresses the scapula , Protracts the scapula , Downwardly rotates the scapula , Assists in forced inhalation (elevates ribs)
N: Medial pectoral nerves (C8 and T1)

Question 6

Elevation of the scapula

Answer 6

Trapezius (upper fibers), Levator scapulae

Question 7

Depression of the scapula.

Answer 7

Trapezius (lower fibers), Serratus anterior, Pectoralis minor

Question 8

Protraction of the scapula.

Answer 8

Serratus anterior , Pectoralis minor

Question 9

Retraction of the scapula.

Answer 9

Trapezius (middle fibers) , Rhomboids

Question 10

Upward Rotation of the scapula.

Answer 10

Trapezius (upper fibers) , Serratus anterior

Question 11

Downward Rotation of the scapula.

Answer 11

Levator scapulae, Rhomboids, Pectoralis minor