Chapter 4 Shoulder Girdle

Question 1

Pectoralis Minor O&I

Answer 1

origin: anterior surfaces of the 3rd to 5th ribs
insertion: coracoid process of the scapula

Question 2

Pectoralis Minor action

Answer 2

action: abduction, downward rotation, depression

Question 3

Pectoralis Minor innervation

Answer 3

innervation: medial pectoral nerve (C8 and T1)

Question 4

Serratus Anterior O&I

Answer 4

origin: surface of the upper 9 ribs at the side of the chest
insertion: anterior aspect of the whole length of the medial order of the scapula

Question 5

Serratus Anterior action

Answer 5

action: abduction, upward rotation

Question 6

Serratus Anterior innervation

Answer 6

innervation: long thoracic nerve (C5-C7)

Question 7

Trapezius upper fibers O&I

Answer 7

origin: base of skull, occipital protuberance, and posterior ligaments of neck
insertion: posterior aspect of the lateral 3rd of the clavicle

Question 8

Trapezius upper fibers action

Answer 8

action: elevation, upward rotation, extension of head at neck, rotation of head at neck

Question 9

Trapezius upper fibers innervation

Answer 9

innervation: spinal accessory nerve and branches of C3 and C4

Question 10

Trapezius middle fibers O&I

Answer 10

origin: spinous process of the 7th cervical and upper 3 thoracic vertebrae
insertion: medial border of the acromion process and superior border of the scapular spine

Question 11

Trapezius middle fibers action

Answer 11

action: elevation, adduction, upward rotation

Question 12

Trapezius middle fibers innervation

Answer 12

innervation: spinal accessory nerve and branches of C3 and C4

Question 13

Trapezius lower fibers O&I

Answer 13

origin: spinous process of the 4th to 12th thoracic vertebrae
insertion: triangular space at the base of the scapular spine

Question 14

Trapezius lower fibers action

Answer 14

action: adduction, depression, upward rotation

Question 15

Trapezius lower fibers innervation

Answer 15

innervation: spinal accessory nerve and branches of C3 and C4

Question 16

Rhomboids O&I

Answer 16

origin: spinous processes of the 7th cervical and first 5 thoracic vertebrae
insertion: medial border of the scapula, inferior to the scapular spine

Question 17

Rhomboids action

Answer 17

action: adduction, downward rotation, elevation

Question 18

Rhomboids innervation

Answer 18

innervation: dorsal scapular nerve (C5)

Question 19

Levator Scapulae O&I

Answer 19

origin: transverse processes of the upper 4 cervical vertebrae
insertion: medial border of the scapula from the superior angle to the scapular spine

Question 20

Levator Scapulae action

Answer 20

action: elevation

Question 21

Levator Scapulae innervation

Answer 21

innervation: dorsal scapular nerve C5 and branches of C3 and C4