Unit 9 Appendicular Muscles Flashcards
What is the origin and insertion of the Pectoral Girdle
Originate: Axial Skeleton
Insert: Clavicle and Scapula
The muscles of the Pectoral Girdle stabilize ___1)___ and movie it to __2)___ the arms angle of movement
1) Scapula
2) Increase
How are muscles that move the pectoral girdle classified?
According to location in thorax as either anterior or posterior thoracic muscles.
What are the two anterior thoracic muscles?
Pectoralis minor and the Serrates anterior
What anterior thoracic muscle is thin, flat, triangular, and muscle deep to the pectorals major?
The Pectoralis minor
What is the action of the Pectoralis Minor?
Protracts and depresses the scapula
Depression of the Pectoralis Minor causes the shoulders to do what?
The shoulders are hunched forward, the pectoralis minor muscle is contracting
What anterior thoracic muscle is large, flat , fan-shaped muscle that is positioned between the ribs and the scapula?
The Serrates anterior
What are the origins and insertions of the Serrates Anterior?
Origins: Upper Limb
What is the action of the Serrates Anterior?
Protracts and depresses scapula (synergist to pectorals minor, stabilizes the scapular and superiorly rotates scapula
The Superior rotation of the scapula by the Serrates Anterior causes the glenoid cavity to move?
Superiorly