Muscles Of Anterior Wall Of Axilla OINA

Question 1

Pectoralis Major Origin

Answer 1

Clavicular head- anterior surface of the medial half of the clavicle
Sternocostal head- anterior surface of the sternum
First 7 costal cartilages
Sternal end of the 6th rib
Aponeurosis of external oblique

Question 2

Pectoralis Major Insertion

Answer 2

Lateral lip of the intertubercular sulcus of the humerus

Question 3

Pectoralis Major Innervation

Answer 3

Medial & lateral pectoral nerves
Clavicular head (C5,C6)
Sternocostal head (C6,C7,C8,T1)

Question 4

Pectoralis Major Action

Answer 4

Flexion, adduction, medial (internal) rotation of the arm at the glenohumeral joint
Clavicular head- flexion of extended arm
Sternocostal head- extension of flexed arm

Question 5

Subclavius Origin

Answer 5

First rib at junction between rib & costal cartilage

Question 6

Subclavius Insertion

Answer 6

Groove on inferior surface of middle 1/3 of clavicle

Question 7

Subclavius Innervation

Answer 7

Nerve to Subclavius (C5,C6)

Question 8

Subclavius Action

Answer 8

Pulls tip of the shoulder down
Pulls clavicle medially to stabilize the sternoclavicular joint

Question 9

Pectoralis Minor Origin

Answer 9

Anterior surfaces & superior borders of ribs 3-5
From deep fascia overlying the related intercostal spaces

Question 10

Pectoralis Minor Insertion

Answer 10

Coracoid process of scapula (medial border & upper surface)

Question 11

Pectoralis Minor Innervation

Answer 11

Medial pectoral nerve (C5,C6,C7,C8,T1)

Question 12

Pectoralis Minor Action

Answer 12

Pulls tip of the shoulder down
Protracts scapula