Pectoral Region

Question 1

Origin of the Pectoralis Major

Answer 1

• Clavicle (Clavicular portion)
• Sternum and upper ribs (Sterno-costal portion)
• External Oblique Muscle (Abdominal portion)

Question 2

Insertion of the Pectoralis Major

Answer 2

• Inter-tuburcular groove/humerus

Question 3

Actions of the Pectoralis Major (Entire muscle)

Answer 3

• Adduction and medial rotation of the humerus

- Forced inspiration

Question 4

Actions of the Pectoralis Major (Clavicular portion)

Answer 4

• Flexes humerus at shoulder joint

Question 5

Actions of the Pectoralis Major (Sternocostal portion)

Answer 5

• Extends humerus at shoulder joint

Question 6

Nerve supply of the Pectoralis Major

Answer 6

• Medial pectoral nerve

- Lateral pectoral nerve

Question 7

Origin of the Pectoralis Minor

Answer 7

• Upper ribs

Question 8

Insertion of the Pectoralis Minor

Answer 8

• Coracoid process/scapula

Question 9

Actions of the Pectoralis Minor

Answer 9

• Involved with protraction/abduction of the scapula

- Forced inspiration

Question 10

Nerve supply of the Pectoralis Minor

Answer 10

• Medial pectoral nerve

Question 11

Origin of the Subclavian

Answer 11

• First rib

Question 12

Insertion of the Subclavian

Answer 12

• Subclavian groove of the clavicle

Question 13

Actions of the Subclavian

Answer 13

• Moves clavicle medially

- Acts as a protective cushion between clavicle and subclavian vessels

Question 14

Nerve of the Subclavian

Answer 14

• Nerve to the subclavius