Unit 9 Appendicular Muscles

Question 1

What is the origin and insertion of the Pectoral Girdle

Answer 1

Originate: Axial Skeleton
Insert: Clavicle and Scapula

Question 2

The muscles of the Pectoral Girdle stabilize ___1)___ and movie it to __2)___ the arms angle of movement

Answer 2

1) Scapula

2) Increase

Question 3

How are muscles that move the pectoral girdle classified?

Answer 3

According to location in thorax as either anterior or posterior thoracic muscles.

Question 4

What are the two anterior thoracic muscles?

Answer 4

Pectoralis minor and the Serrates anterior

Question 5

What anterior thoracic muscle is thin, flat, triangular, and muscle deep to the pectorals major?

Answer 5

The Pectoralis minor

Question 6

What is the action of the Pectoralis Minor?

Answer 6

Protracts and depresses the scapula

Question 7

Depression of the Pectoralis Minor causes the shoulders to do what?

Answer 7

The shoulders are hunched forward, the pectoralis minor muscle is contracting

Question 8

What anterior thoracic muscle is large, flat , fan-shaped muscle that is positioned between the ribs and the scapula?

Answer 8

The Serrates anterior

Question 9

What are the origins and insertions of the Serrates Anterior?

Answer 9

Origins: Upper Limb

Question 10

What is the action of the Serrates Anterior?

Answer 10

Protracts and depresses scapula (synergist to pectorals minor, stabilizes the scapular and superiorly rotates scapula

Question 11

The Superior rotation of the scapula by the Serrates Anterior causes the glenoid cavity to move?

Answer 11

Superiorly