Axilla and Brachial Plexus

Question 1

what is the axilla

Answer 1

the area of transition between neck and arm(gateway to the upper limb)

Question 2

the axilla is formed by

Answer 2

Clavicle, scapula and humerus
- Upper thoracic wall and related muscles

Question 3

what do major vessels and nerves pass between neck and axilla

Answer 3

they crossover the lateral border of the first rib and through axillary inlet

Question 4

the subclavian artery changes names to what after crossing the lateral margin of the first rib and enters axilla

Answer 4

it changes to axillary artery

Question 5

the axillary vein becomes what as it passes over the lateral margin of the first rib and exits axilla

Answer 5

it becomes the subclavian vein

Question 6

where do the inferior trunk of brachial plexus ,subclavian artery and subclavian vein lie

Answer 6

directly on the first rib

Question 7

what are the artery and vein separated by as they pass over the first rib

Answer 7

by the insertion of anterior scalene muscle

Question 8

what is the clavipectoral fascia

Answer 8

this is the thick sheet of connective tissue that connects the clavicle to the floor of the axilla

Question 9

what does the clavipectorial fascia enclose

Answer 9

subclavius and pectoralis minor muscles

Question 10

what forms the lateral wall

Answer 10

entirely by the intertubercular sulcus of the humerus

Question 11

the posterior wall is formed by

Answer 11

coastal surface of the scapula

Question 12

what are the muscles of the posterior wall

Answer 12

subcapularis,teres major,latissimus dorsi and the long heads of triceps brachii

Question 13

what are muscles of the anterior wall

Answer 13

pectarolis major,pectarolis minor,subclavius and clavipectorial fascia

Question 14

where does the pectarolis major insert

Answer 14

the lateral lip of intertubercular sulcus of humerus

Question 15

what are the spaces of the posterior wall

Answer 15

quadrangular,triangular space and triangular interval space

Question 16

what does the axillary artery become at inferior margin of teres major muscle

Answer 16

it becomes the brachial artery

Question 17

what does the basilic vein become at inferior margin of teres major muscle

Answer 17

becomes the axillary vein

Question 18

function of the basilic vein

Answer 18

drains posteromedial surface of the hand and forearm

Question 19

function of cephalic vein

Answer 19

drains lateral and posterior parts of hand, forearm and arm

Question 20

facts about axillary nodes

Answer 20

drain lymphatics from upper limb and also receive drainage from trunk and breast

Question 21

list the 5 groups of axillary nodes

Answer 21

-humeral(lateral)
pectoral(anterior)
subscapular(posterior)
central
apical

Question 22

what is the brachial plexus formed by

Answer 22

C5-T1