Axilla and Brachial Plexus

Question 1

Pectoralis Major O

Answer 1

Clavicluar head: anterior surface of medial half of clavicle

Sternocostal head: anterior surface of sternum, superior six costal cartilages, aponeurosis of external oblique muscle

Question 2

Pectoralis Major I

Answer 2

lateral lip of intertubuclar sulcus (groove) of humerus

Question 3

Pectoralis Major Innervation

Answer 3

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

Question 4

Pectoralis Major Action

Answer 4

adducts and medially rotates shoulder joint, draws scapula anteriorly and inferiorly.

Question 5

Pectroalis Minor O

Answer 5

3rd and 5th ribs near their costal cartilages

Question 6

Pectoralis Minor I

Answer 6

medial border and superior surface of coracoid process of scapula

Question 7

Pectoralis Minor Innervation

Answer 7

medial pectoral nerve C8,T1

Question 8

Pectoralis Minor Action

Answer 8

stabilizes scapula by drawing inferiorly and anteriorly against thoracic wall

Question 9

Serratus Anterior O

Answer 9

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

Question 10

Serratus Anterior I

Answer 10

anterior surface of medial border of scapula

Question 11

Serratus Anterior Innervation

Answer 11

long thoracic nerve C5,C6,C7

Question 12

Serratus Anterior Action

Answer 12

protracts scapula and holds against thoracic wall, rotates scapula

Question 13

Subclavius O

Answer 13

junction of 1st rib and its costal cartilage

Question 14

Subclavius I

Answer 14

inferior surface of middle third of clavicle

Question 15

Subclavius Innervation

Answer 15

subclavian nerve (C5,C6)

Question 16

Subclavius Action

Answer 16

anchors and depresses clavicle

Question 17

Inferior belly of omohyoid

Answer 17

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