Axilla and brachial plexus

Question 1

What forms the anterior border of your axilla

Answer 1

Pectoralis major and minor, suspensory ligament of the axilla, subclavius, clavicle

Question 2

What forms the base of the axilla

Answer 2

Axillary fascia

Question 3

What forms the posterior border of the axilla

Answer 3

latissmus dorsi,

Question 4

What forms the medial wall of the axilla

Answer 4

Serratus anterior

Question 5

What forms the apex of the axilla

Answer 5

posterior border the superior border of the scapula, anterior border the clavicle, medial border 1st rib. How things get in and out of the limb.

Question 6

What are the nerve roots the form the brachial plexus

Answer 6

C4-T2. Mostly C5 to T1

Question 7

What point of the nervous system does the brachial plexus start

Answer 7

Anterior rami of spinal nerves- which have comes from spinal nerves which are formed from dorsal and ventral roots and rootlets.

Question 8

What are the five segments of the brachial plexus

Answer 8

Roots, trunks, divisions, cords, terminal branches

Question 9

Describe the roots from most superior to inferior

Answer 9

C5 and C6 join, C7 solo, C8 and T1 join

Question 10

Describe the trunks from superior to inferior

Answer 10

Superior, middle and inferior

Question 11

Describe the divisions from superior to inferior

Answer 11

Each of the three trunks gives off two division and anterior and posterior. The three posterior divisions join. The two most superior anterior divisions join and the most inferior anterior division is by itself

Question 12

Describe the cords

Answer 12

Three. Lateral, posterior and medial in relation to the brachial artery. Formed by the divisions joining.

Question 13

Describe the terminal branches

Answer 13

Each cord gives off two branches but the lateral and medial cords together form one terminal branch so total branches are 5. Musculocutaneous, axillary, radial, median, ulnar

Question 14

What does musculocutneous nerve supply

Answer 14

All the anterior compartment muscles of the arm. Then becomes lateral cutaneous nerve and supplies lateral skin of forearm.

Question 15

What does the median nerve supply

Answer 15

Most of the muscles in the anterior compartment of the forearm and thumb side muscles of hand also cutaneous lateral side of hand

Question 16

What does the ulnar nerve supply

Answer 16

Supplies the muscles in the forearm that the median nerve doesn’t. Supplies most hand muscles. Cutaneous little finger and half fourth finger

Question 17

What does the axillary nerve supply

Answer 17

Teres minor, deltoid and cutaneous distribution over shoulder (turns into superior lateral cutanous nerve of the arm.

Question 18

What does the radial nerve supply

Answer 18

Supplies all the posterior compartment muscles of arm and forearm.
Elaborate cutaneous distributionmiddle posterior surface of arm and forearm. Most of back of hand not finger tips or fifth finger.

Question 19

Mnemonic for remembering arterial supply to axillary region

Answer 19

Sixties (supreme thoracic)
Teens (thoracoacromial)
Love (lateral thoracic)
Sex (Subscapular)
And (Anterior circumflex humeral)
Pot (posterior circumflex humeral)

Question 20

Branches off the thoracoacromial artery

Answer 20

TEENS- cadavers are dead people

Clavicular, acromial, deltoid, pectoral

Question 21

Branches off the sub scapular artery

Answer 21

SEX (is a big deal, big trunk!) end in STD
S- scapula circumflex
TD - thoraco-dorsal branch