Axilla and Brachial Plexus

Question 1

What are the arteries of the proximal upper limb?

Answer 1

Subclavian
Axillary
Brachial

Question 2

What forms the brachial plexus?

Answer 2

ventral rami of C5-T1spinal nerves

Question 3

What does the brachial plexus supply?

Answer 3

The structures of the upper limb

every muscle of the upper limb receives its own nerve supply from a branch of the brachial plexus

Question 4

Where do the roots of brachial plexus emerge?

Answer 4

Between anterior and Middle scalene

Question 5

Robert Taylor Drinks Cold Beer (Order of Branches )

Answer 5

Roots,Trunks, Divisions,Cords,Terminal Branches

Question 6

How many are in each section?

Answer 6

5 roots
3 trunks
3 anterior division 3 posterior divisions
3 cords
then terminal branches

Question 7

Name the 5 Ventral rami

Answer 7

C5
C6
C7
C8
T1

Question 8

What are the three trunks?

Answer 8

superior middle inferior

Question 9

Name the 5 terminal branches

Answer 9

Radial Nerve
Median Nerve
Ulnar Nerve
Axillary Nerve
Musculocutaneous Nerve

Question 10

What are Collateral branches?

Answer 10

Nerves that arise from the brachial plexus prior to the terminal branches

They arise from the roots, trunks, and cords of the plexus

Question 11

What do collateral branches innervate?

Answer 11

Muscles of the scapular region

Question 12

What are nerves located superior and inferior to the clavicle called?

Answer 12

Supraclavicular nerve
infracclavicular nerve

Question 13

What muscles does the MusculoCutaneious nerve innervate?

Answer 13

The anterior arm- Biceps, Brachii, coracobrachialis, brachialis

Question 14

What muscles does the Median nerve innervate?

Answer 14

Most of anterior forearm- wrist and finger flexors-except flexor carpi ulnaris.

The thumb muscles

2 lateral lumbricals

Question 15

What muscles does the Ulnar nerve innervate?

Answer 15

Most of hand; one muscle in the anterior forearm( the flexor carpi ulnaris)

Question 16

What muscles does the Radial nerve nerve innervate?

Answer 16

Posterior arm- Triceps, brachii, anconeus

posterior forearm- (wrist and finger extensors)

Question 17

What muscles does the Axillary nerve innervate?

Answer 17

Deltoid and teres minor

Question 18

What is the advantage to the arrangement of the nerves in the plexus?

Answer 18

The nerves supplying muscles of the extremities are carrying neurons from more than one spinal cord level- so damage to one segment wont result in complete loss in any one muscles

also with so many muscles in UE the spinal cord would need to be super long to supply them with nerves

Question 19

Where does the axillary nerve wrap ?

Answer 19

The nerve wraps around the surgical neck of the humerus

Question 20

Where does the radial nerve run?

Answer 20

It runs in the radial groove in the mid shaft of the humerus