Shoulder girdle

Question 1

Levator scapulae

Answer 1

Origin: Posterior tubercles of the transverse processes of cervical vertebrae C1-C4.
Insertion: Superior part of the medial border of the scapula.
Action: Elevates the scapula, tilts the glenoid cavity inferiorly by rotating the scapula downward.
Innervation: Dorsal scapular nerve (C5) and cervical nerves C3 and C4.

Question 2

Pectoralis minor

Answer 2

Origin- ribs 3-5

Insertion- corocoid process of scapula
Action - depression, downward rotation, abduction of scapula, elevation of ribs
Innervation -medial pectoral nerve

Question 3

Rhomboids (Major and Minor)

Answer 3

Origin-
Minor: nuchal ligament and spinous processes of C7 and T1 vertebrae
Major: spinous processes of T2 - T5 vertebrae
Insertion- Medial border of scapula from level of spine to inferior angle
Action - retract and rotate the scapula, which helps to stabilize the shoulder girdle
Innervation - Dorsal scapular nerve

Question 4

Serratus anterior

Answer 4

Origin- The lateral surfaces of the upper 8 or 9 ribs.
Insertion-Medial border of the scapula
Action - Protraction and upward rotation of the scapula
Innervation - Long thoracic nerve

Question 5

Trapezius I

Answer 5

Origin- Occipital bone and ligamentum nuchae
Insertion- Posterior border of the lateral third of the clavicle
Action - Elevation
Innervation -Accessory nerve

Question 6

Trapezius II

Answer 6

Origin- Ligamentum nuchae
Insertion- Top of acromion process
Action -Elevation, upward rotation, adduction
Innervation -Accessory nerve

Question 7

Trapezius III

Answer 7

Origin- Spinous processes of C7 and upper three thoracic vertebrae
Insertion- scapular spine
Action -Adduction
Innervation - Accessory nerve

Question 8

Trapezius IV

Answer 8

Origin- Spinous processes of T4 through T12
Insertion- Root of scapular spine
Action -Upward rotation, depression, adduction
Innervation - Accessory nerve