5/31-6/1 axilla muscles

Question 1

pectoralis major

Answer 1

PA
clavicular head
-anterior surface of medial half of clavicle
sternocostal head
-anterior surface of sternum,
-sup 6 costal cartilage
-aponeurosis of external obliquus muscle

DA
-lateral lip of intertuberculad sulcus of humerus

I

• lateral and medial pectoral nerves
• clavicular head C6
• sternocostal head C7C8

A

• adduct and medially rotates sj
• draws scapula anteriorly and inferiorly
• clavicular head flexes sj
• sternocostal head extend it from flex position

Question 2

pectoralis minor

Answer 2

PA
-3rd to 5th ribs near their costal cartilages

DA
-medial border and superior surface of coracoid process

I
-medial pectoral nerve C8T1

A
-stabilize scaoula by drawing inferiorly and anterior against thoracic wall

Question 3

subclavius

Answer 3

PA
-junction of 1st rib and its costal cartilage

DA
-inferior surface of middle third clavicle

I
-subclavian nerve C5

A
-anchors and delrwses clavicle

Question 4

serratus anterior

Answer 4

PA
-external surface of lateral part of 1st-8th ribs

DA
-anterior surface of medial border of scapula

I
-long thoracic nerve C6C7

A

• protects scapula and holds against thoracic wall
• rotates scapula

Question 5

omohyoid

Answer 5

O
-superior border of scapula near suprascapular notch

IS
-inferior border of hyoid

I
-C1-C3 by branch of ansa cervicalis

A
-depresses, retracts, and steadies hyoid