Anterior Thoracic Muscles Flashcards
What are the 2 origins of the Pectoralis major?
1) clavicular head originates on the medial clavicle
2) sternocostal head originates on the sternum and costal cartilage of the jest 6 ribs
Where does the Pectoralis major insert?
Bicipital groove
What does Pectoralis major contribute to the axillary wall?
Creates anterior border of axillary wall
What are the 2 general actions of the Pectoralis major?
GH adduction and GH medial rotation
What are the main actions of the clavicular head of the Pectoralis major?
GH flexion and GH cross flexion
What is the main action of the sternocostal head of the Pectoralis major?
GH extension (from flexed position)
What is the composite action of Pectoralis major?
Hugging
What are the origin and insertion of Pectoralis minor?
Origin: ribs 3-5
Insertion: Coracoid process
What are the 2 main actions of Pectoralis minor?
Scapular depression and scapular protraction
Which muscle is referred to as the “reach beyond reach muscle”
Pectoralis minor
Where is Pectoralis minor in relation to Pectoralis major?
Entirely deep to Pectoralis major
What are the origin and insertion of subclavius?
Origin: rib I
Insertion: inferior surface of clavicle
What is the main action of subclavius?
Anchors and depresses clavicle
Which muscle is referred to as the boxer muscle?
Serratus anterior
What are the origin and insertion of serratus anterior?
Origin: upper 8 ribs by digitation
Insertion: medial border of scapula
