Chest Muscles_OIAN

Question 1

Pectoralis major ORIGIN

Answer 1

Clavicular head: Medial half of clavicle; Sternocostal head: Sternum and upper six costal cartilages

Question 2

Pectoralis major INSERTION

Answer 2

Lateral lip of bicipital groove of humerus

Question 3

Pectoralis major NERVE SUPPLY

Answer 3

Medial and lateral pectoral nerves from medial and lateral cords of brachial plexus

Question 4

Pectoralis major ACTION

Answer 4

1. Adducts and medially rotates the arm, 2. Flexes arm (clavicular head)

Question 5

Pectoralis minor ORIGIN

Answer 5

3rd-5th ribs

Question 6

Pectoralis minor INSERTION

Answer 6

Coracoid process of scapula

Question 7

Pectoralis minor NERVE SUPPLY

Answer 7

Medial pectoral nerve

Question 8

Pectoralis minor ACTION

Answer 8

1. Depresses scapula; 2. Elevates ribs of origin (if shoulder is fixed) for deep inspiration

Question 9

Serratus anterior ORIGIN

Answer 9

Upper eight ribs

Question 10

Serratus anterior INSERTION

Answer 10

Medial border of scapula

Question 11

Serratus anterior NERVE SUPPLY

Answer 11

Long thoracic nerve

Question 12

Serratus anterior ACTION

Answer 12

1. Rotates scapula- glenoid fossa faces sperlaterally
2. Draws scapula forward around thoracic wall (protraction)
3. Holds scapula against thoracic wall.

Question 13

Subclavius ORIGIN

Answer 13

1st costal cartilage

Question 14

Subclavius INSERTION

Answer 14

Clavicle

Question 15

Subclavius NERVE SUPPLY

Answer 15

Nerve to subclavius (from upper trunk of brachial plexus)

Question 16

Subclavius ACTION

Answer 16

Anchors and depresses clavicle during upper limb movements