Anterior Axio-Appendicular Muscles

Question 1

Pectoralis Major - Origin

Answer 1

Clavicular head: anterior surface of medial half of the clavicle
Sternocostal head: anterior surface of sternum, superior six costal cartilages, aponeurosis of external oblique muscle

Question 2

Pectoralis Major - Insertion

Answer 2

Lateral lip of intertubercular sulcus of humerus

Question 3

Pectoralis Major - Innervation

Answer 3

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

Question 4

Pectoralis Major - Action(s)

Answer 4

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

Acting alone, clavicular head flexes shoulder joint and sternocostal head and extends it from the flexed position

Question 5

Pectoralis Minor - Origin

Answer 5

3rd-5th ribs near their costal cartilages

Question 6

Pectoralis Minor - Insertion

Answer 6

Medial border and superior surface of corocoid process of scapula

Question 7

Pectoralis Minor - Innervation

Answer 7

Medial pectoral nerve (C8, T1

Question 8

Pectoralis Minor - Action(s)

Answer 8

Stabilize scapula by drawing inferiorly and anteriorly against thoracic wall

Question 9

Subclavius - Origin

Answer 9

Junction of 1st rib and its costal cartilage

Question 10

Subclavius - Insertion

Answer 10

Medial border and superior surface of corocoid process

Question 11

Subclavius - Innervation

Answer 11

Subclavian nerve (C5, C6)

Question 12

Subclavius - Action(s)

Answer 12

Anchors and depresses clavicle

Question 13

Serratus Anterior - Origin

Answer 13

External surface of the lateral parts of 1st -8th ribs

Question 14

Serratus Anterior - Insertion

Answer 14

Anterior surface of medial border of scapula

Question 15

Serratus Anterior - Innervation

Answer 15

Long thoracic nerve (C5, C6, C7)

Question 16

Serratus Anterior - Action(s)

Answer 16

Protracts scapula and holds it against thoracic wall

Rotates scapula