5.2 Anatomy of Muscular System

Question 1

What does the trapezius act on?

Answer 1

shoulder
neck
upper spine

Question 2

What are the muscles of the shoulder and upper extremity?

Answer 2

trapezius
levator scapulae
rhomboids
pectoralis minor
serratus anterior

Question 3

What is the origin and insertion of the trapezius?

Answer 3

origin = occipital bone and spinous process of T1-12
insertion = lateral clavicle, acromion, and scapular spine of scapula

Question 4

What is the action of the trapezius?

Answer 4

rotation, retraction, elevation, depression of scapula
extends neck
stabilizes shoulder

Question 5

What is the innervation of the trapezius?

Answer 5

CN11 (accessory nerve)

Question 6

What is the origin and insertion of the levator scapulae?

Answer 6

origin = transverse process of C1-4
insertion = medial border of scapula

Question 7

What is the action of the levator scapulae?

Answer 7

elevates the scapula

Question 8

What is the innervation of the levator scapulae?

Answer 8

dorsal scapular nerve

Question 9

What is the origin and insertion of the rhomboids?

Answer 9

origin = spinous process (minor is C7-T1 and major is T2-5)
insertion = medial border of scapula

Question 10

What is the action of the rhomboids?

Answer 10

retraction of scapula

Question 11

What is the innervation of the rhomboids?

Answer 11

dorsal scapular nerve

Question 12

What is the origin and insertion of the pectoralis minor?

Answer 12

origin = ribs 3-5
insertion = coracoid process of scapular

Question 13

What is the action of the pectoralis minor?

Answer 13

elevates ribs
draws scapula down and medially

Question 14

What is the innervation of the pectoralis minor?

Answer 14

medial pectoral nerve

Question 15

What is the origin and insertion of the serratus anterior?

Answer 15

origin = upper 8-9 ribs
insertion - medial border of scapula

Question 16

What is the action of the serratus anterior?

Answer 16

protraction of scapula

Question 17

What is the innervation of the serratus anterior?

Answer 17

long thoracic nerve

Question 18

What are the muscles of the shoulder girdle?

Answer 18

deltoid
pectoralis major
supraspinatus
infraspinatus
teres minor
teres major
subscapularis
latissimus dorsia
coracobrachialis

Question 19

What are the muscles of the rotator cuff?

Answer 19

SITS
supraspinatus
infraspinatus
teres minor
subscapularis

Question 20

What is the origin and insertion of the deltoid?

Answer 20

origin = clavicle and scapula
insertion = deltoid tuberosity of humerus