Axilla

Question 0

Base of the axilla

Answer 0

Formed by the concave skin, subcutaneous tissue, and axillary(deep) fascia extending from the arm to the thoracic wall forming the axillary fossa(armpit)

Question 1

Apex of axilla

Answer 1

Is the cervico-axiallary canal, which is the passage way between the neck and the axilla

It is bounded by the first rib , clavicle, and superior edge of scapula

Question 2

Anterior wall of axilla

Answer 2

Is formed by the pec major and minor and the pectoral and clavipectoral fascia

Anterior axillary fold is the most inferior part of the anterior wall

Question 3

Posterior wall of the axilla

Answer 3

Anteriorly formed by the scapula and subscapulari

inferiorly by lats and teres major

Question 4

Medial wall of axilla

Answer 4

Formed by the thoracic wall and the overlying serratus anterior

Question 5

Lateral wall of axilla

Answer 5

Is the narrow bony wall formed by the intertubercular sulcus of humerus

Question 6

Axillary artery (first part)

Answer 6

Located between lateral border of the first rib and the medial border of pec minor
It is enclosed in axillary sheath and has one branch: the superior thoracic artery

Question 7

Axillary artery(second part)

Answer 7

Lies posterior to the pectoralis minor and has 2 branches: the thoraco-acromial artery and lateral thoracic artery

Question 8

Axillary artery(3rd part)

Answer 8

Extends from the lateral border of the pectoralis minor to the inferior border of the teres major and has 3 branches: the subscapular artery(largest), the anterior circumflex humeral artery, and posterior circumflex humeral artery

Question 9

Seperior thoracic artery

Answer 9

First part of axillary

Helps supply first and second intercostal spaces and superior part of Sarratus anterior

Question 10

Thoraco-acromial artery

Answer 10

2nd part of axillary

Divides into four branches: pectoral, deltoid, acromial, and clavicular

Question 11

Lateral thoracic artery

Answer 11

Second part of axillary

Supply lateral aspect of breast

Question 12

Circumflex humeral(posterior and anterior)

Answer 12

Third part of axillary
Encircle surgical neck of humerous, anastomosing with each other laterally; larger posterior branch traverses quadrangular space

Question 13

Subscapular artery

Answer 13

Third part of axillary artery
Descends from level of inferior border of subscapularis along lateral border of scapula, dividing within 2-3 cm into terminal branches, the circumflex scapular, and thoracodorsal arteries

Question 14

Roots of the brachial plexus are ____ and begin_____

Answer 14

C5-t1 anterior rami
Lateral cervical region(posterior triangle)

Plexus- network of nerves …innervating the upper limbs

Question 15

In the inferior part of the neck the roots of the brachial plexus unite to form______

Answer 15

3 trunks: superior, middle, and inferior

Question 16

Superior trunk of brachial plexus

Answer 16

From the union of c5 and c6 roots

Question 17

Middle trunk of the brachial plexus

Answer 17

Which is a continuation of the c7 root

Question 18

Inferior trunk of brachial plexus

Answer 18

From the union of c8 and t1 roots

Question 19

Anterior divisions of the trunks

Answer 19

Supply the anterior(flexor) compartments of the upper limb

Question 20

Posterior divisions of the trunks

Answer 20

Supply posterior(extensor) compartments of the upper limb

Question 21

Lateral cord of b.p.

Answer 21

Formed by the union of Anterior devisions of the superior and middle trunks
-1st branch of this is lateral pectoral nerve

Question 22

Medial cord of b.p.

Answer 22

Continuation of the anterior division of the inferior trunk
-1st medial pectoral nerve

• 2nd medial cutaneous nerve of arm
• 3rd medial cutaneous forearm

Question 23

Posterior cord of the b.p.

Answer 23

Formed by the union of all the posterior divisions of all 3 trunks
Behind the axillary artery

1st branch upper subscapular
2nd thoracodorsal nerve
3rd lower subscapular

Question 24

Axillary artery

Answer 24

Continuation of the subclavian artery
-first rib
Continues distally as brachial artery
-inferior border of teres major
3 parts
-divided by pec minor

Question 25

Subclavian artery stops where the axillary starts. Where is this?

Answer 25

Lateral border of 1st rib

Question 26

Terminal branches of lateral cord

Answer 26

Musculocutaneous n

Half of the median n

Question 27

Terminal branches of posterior cord

Answer 27

Axillary n

Radial n

Question 28

Terminal branches of medial cord

Answer 28

Ulnar n

Half of the median n