Pectoral Region

Question 1

Origin of Pectoralis Major

Answer 1

• Clavicle, front of medial 2/3
• Sternocostal:
  •front of sternum
  •upper 6 costal cartilages
  •external oblique aponeurosis

Question 2

Insertion of Pectoralis Major

Answer 2

Lateral lip of the bicipital groove of the humerus

Question 3

Nerve Supply of Pectoralis Major

Answer 3

Brachial Plexus, Medial and Lateral Pectoral Nerves

Question 4

Action of Pectoralis Major

Answer 4

• Adduction and medial rotation of the arm
• Flexion of the arm (clavicular head)
  If humerus is fixed:
• Accessory inspiratory
• Aids in climbing

Question 5

Origin of Pectoralis Minor

Answer 5

• Front of the 3rd, 4th, and 5th ribs

Question 6

Insertion of Pectoralis Minor

Answer 6

• Medial and Upper aspect of the coracoid process of the scapula

Question 7

Nerve Supply of Pectoralis Minor

Answer 7

Brachial Plexus, medial pectoral nerve

Question 8

Action of Pectoralis Minor

Answer 8

• Protraction (pull scapula down)
• Shoulder depression
• Accessory inspiratory

Question 9

Origin of Subclavius

Answer 9

• Upper surface of the 1st costochondral junction

Question 10

Insertion of Subclavius

Answer 10

• Subclavius groove of clavicle

Question 11

Nerve Supply of Subclavius

Answer 11

Brachial Plexus, nerve to subclavius

Question 12

Action of Subclavius

Answer 12

• Steadies the clavicle and fixes it to the first rib

Question 13

Structures Piercing the Clavipectoral Fascia

Answer 13

• Cephalic Vein
• Thoraco-acromial Artery
• Lymphatic Vessels
• Lateral Pectoral Nerve