1What is the origin of the clavicular head of pectoralis major?
Medial \$1\frac{1}{2}\$ of the clavicle
2What is the origin of the sternocostal head of pectoralis major?
Sternum and upper 6 costal cartilages
3What is the origin of the abdominal head of pectoralis major?
Costal cartilages of ribs 7-8
4What is the insertion of pectoralis major?
Lateral lip of the intertubercular sulcus
5What are the general actions of pectoralis major?
Adduction and medial (internal) rotation of the humerus
6What action does the clavicular head of pectoralis major perform?
Flexion of the humerus
7What action does the sternocostal head of pectoralis major perform?
Extension of the humerus from a flexed position
8Which nerves innervate the pectoralis major?
- Medial pectoral nerve
- Lateral pectoral nerve
9What is the blood supply of pectoralis major?
Thoracoacromial artery (pectoral branch)
10What is the origin or proximal attachment of pectoralis minor?
Ribs 3-5
11What is the insertion or distal attachment of pectoralis minor?
Coracoid process of the scapula
12What are the actions of pectoralis minor on the scapula?
Protraction, downward rotation, depression, and anterior tilt
13What does pectoralis minor assist with when the scapula is fixed?
Inspiration by raising the rib cage
14Which nerve innervates the subclavius?
Subclavius nerve (\$C5\$)
15What blood supply serves the subclavius?
Superior thoracic artery
16What is the origin of the serratus anterior?
Ribs 1-8/9
17What is the insertion of the serratus anterior?
Anterior surface of the medial/vertebral border of the scapula and the inferior angle
18What are the main actions of the serratus anterior?
Protracts and upwardly rotates the scapula
19How does the serratus anterior help during overhead activities?
Keeps the glenoid fossa apposed with the humeral head
20What function does the serratus anterior serve regarding the rib cage?
Holds the scapula tight against the rib cage
21What does the serratus anterior assist with when the scapula is fixed?
Inspiration by raising the rib cage
22Which nerve innervates the serratus anterior?
Long thoracic nerve (\$C5-C7\$)
23What is the blood supply of the serratus anterior?
Lateral thoracic artery
24Which artery's first part gives rise to the superior thoracic artery?
Axillary artery
25What structures are supplied by the superior thoracic artery?
- Pectoralis major
- Pectoralis minor
- Subclavius
26Which artery's second part gives rise to the thoracoacromial artery and lateral thoracic artery?
Axillary artery
27What are the branches of the thoracoacromial artery/trunk?
- Acromial branch
- Deltoid branch
- Pectoral branch
- Clavicular branch
28What muscles are supplied by the lateral thoracic artery?
- Subscapularis
- Serratus anterior
29What arteries arise from the third part of the axillary artery?
- Subscapular artery
- Anterior circumflex humeral artery
- Posterior circumflex humeral artery