Anterior Axio-appendicular muscles

Question 0

Insertion of the Pectoralis Major

Answer 0

Lateral lip of the intertubercular sulcus(groove) of humerus

Question 1

Origin of the Pectoralis Major

Answer 1

Clavicular head: anterior surface of medial half of clavicle

Sternocostal head: Anterior surface of sternum, superior six costal cartilages, apooneurosis of external oblique muscle.

Question 2

Innervation of Pectoralis Major

Answer 2

Lateral and medial pectoral nerves, clavicular head(C5, C6)
Sternocostal head(C7, C8, T1)

Question 3

Action of Pectoralis Major

Answer 3

Adducts and medially rotates shoulder joint, draws scapula anteriorly and inferiorly

Acting alone: clavicular head flexes shoulder joint and Sternocostal head extends it from the flexed position

Question 4

Origin of Pectoralis Minor

Answer 4

3rd-5th ribs near their costal cartilages

Question 5

Insertion of the Pectoralis Minor

Answer 5

Medial border and superior surface of coracoid process of scapula

Question 6

Innervation of Pectoralis Minor

Answer 6

Medial pectoral nerve (C8, T1)

Question 7

Action of Pectoralis Minor

Answer 7

Stablizes scapula by drawing inferiorly and anteriorly against the thoracic wall.

Question 8

Origin of the subclavius

Answer 8

Junction of 1st rib and its costal cartilage

Question 9

Insertion of subclavius

Answer 9

Inferior surface of middle third of clavicle

Question 10

Innervation of subclavius

Answer 10

Subclavian nerve (C5, C6)

Question 11

Action of subclavius

Answer 11

Anchors and depresses clavicle

Question 12

Origin of serratus anterior

Answer 12

External surfaces of lateral parts of 1st-8th ribs

Question 13

Insertion of serratus anterior

Answer 13

anterior surface of medial border of scapula

Question 14

Innervation of serratus anterior

Answer 14

Long thoracic nerve (C5, C6, C7)

Question 15

Action of serratus anterior

Answer 15

Protracts scapula and holds against thoracic wall, rotates scapula