Axilla & Brachial Plexus

Question 1

anterior wall of axilla?

Answer 1

pectoralis major

Question 2

posterior wall of axilla?

Answer 2

teres major

Question 3

what is the axillary vein a continuation of?

Answer 3

the brachial vein (becomes axillary at lower border of teres major muscle)

Question 4

what is the axillary artery a continuation of?

Answer 4

subclavian artery (becomes axillary at lateral border of first rib)

Question 5

the anterior rami of what make up the brachial plexus?

Answer 5

C5-T1

Question 6

what are the 5 roots of the brachial plexus?

Answer 6

C5
C6
C7
C8
T1

Question 7

what makes up the superior trunk of the brachial plexus?

Answer 7

anterior rami of C5 and C6

Question 8

what makes up the middle trunk of the brachial plexus?

Answer 8

anterior rami of C7

Question 9

what makes up the inferior trunk of the brachial plexus?

Answer 9

C8 and T1

Question 10

what makes up the medial cord of the brachial plexus?

Answer 10

continuation of inferior trunk (C8 and T1)

Question 11

what makes up the lateral cord of the brachial plexus?

Answer 11

anterior division of superior and middle trunks (C5,6,7)

Question 12

what makes up the posterior cord of the brachial plexus?

Answer 12

posterior division of all 3 trunks (C5-T1)

Question 13

what are the 5 named nerves of the brachial plexus?

Answer 13

musculocutaneous
axillary
median
radial
ulna

Question 14

describe the brachial plexus in terms of roots, trunks etc.

Answer 14

roots>trunks>divisions>cords>terminal nerves

Question 15

name the 5 groups of axillary lymph nodes

Answer 15

pectoral
subscapular
humeral
central
apical

Question 16

where do the pectoral nodes receive lymph from?

Answer 16

the breast

Question 17

where do the subscapular nodes get lymph from?

Answer 17

subscapular region

Question 18

which nodes get lymph from upper limbs?

Answer 18

humeral nodes

Question 19

where are the apical nodes located?

Answer 19

apex of axilla along medial side of axillary vein and first part of axillary artery.

Question 20

where does all the lymph in the axillary end up?

Answer 20

apical nodes

Question 21

what do injuries to the brachial plexus cause?

Answer 21

paralysis or anethesia

Question 22

injuries to the superior part of brachial plexus (C5-6) are usually caused by what?

Answer 22

from a big increase in angle between neck and shoulder e.g. when thrown from a motorbike or horse or stretching of the neck during pregancy

Question 23

injuries to the inferior part may be caused by what?

Answer 23

when upper limb is suddenly pulled superiorly