Axillary Contents, Brachial Plexus

Question 1

Anterior boundary of the axillary region?

Answer 1

Pec. Major, Pec. Minor, Clavipectoral Fascia

Question 2

Boundary marking the inlet of the axillary region?

Answer 2

1st rib, scapula clavicle

Question 3

Boundary marking the medial axillary wall?

Answer 3

Serratus anterior, upper ribs

Question 4

lateral boundary of the axillary region?

Answer 4

intertubercular groove

Question 5

Posterior wall of the axillary region?

Answer 5

subscapularis, teres major, latissimus dorsi

Question 6

Contents of the axillary region?

Answer 6

cords and terminal branches of the brachial plexus, axillary lymph nodes, axillary artery, fat

Question 7

Location of 1st part of the axillary artery?

Answer 7

medial to where it runs under pec. minor.

Question 8

Location of 2nd part of the axillary artery?

Answer 8

portion located under pec. minor

Question 9

3rd part of the axillary artery?

Answer 9

lateral to pec. minor insertion on coracoid process

Question 10

How many divisions are in each part of the axillary artery?

Answer 10

1st - 1 div.
2nd- 2 div.
3rd - 3 div.

Question 11

Branches of the 1st part of the axillary artery?

Answer 11

supreme thoracic

Question 12

Branches of the 2nd part of the axillary artery?

Answer 12

thoracoacromial a., lateral thoracic a.

Question 13

Branches of the Thoracoaromial trunk?

Answer 13

Clavicular, acromial, deltoid, PECTORAL

Question 14

Branches of the 3rd part of the axillary artery?

Answer 14

POSTERIOR CIRCUMFLEX HUMERAL, ANTERIOR CIRCUMFLEX HUMERAL ARTERY, SUBSCAPULAR ARTERY

Question 15

Branches of the subscapular artery?

Answer 15

circumflex scapular artery, thoracodorsal artery

Question 16

Why is the axillary space important?

Answer 16

its the gateway to the upper limb

Question 17

What regions are linked by the axillary space?

Answer 17

Thoracic and neck region to arm

Question 18

What encloses the contents of the axillary region?

Answer 18

The axillary sheath

Question 19

Roots of the brachial plexus are also known as…

Answer 19

ventral primary rami

Question 20

What compartment do the anterior divisions supply?

Answer 20

anterior

Question 21

what compartment do the posterior divisions supply?

Answer 21

Posterior

Question 22

The lateral cord contains fibers from what ventral rami?

Answer 22

C5-C7

Question 23

The medial cord contains fibers from which ventral rami?

Answer 23

C8-T1

Question 24

The posterior cord contains fibers from which ventral rami?

Answer 24

C5-T1

Question 25

How are the nerve cords named in the brachial plexus?

Answer 25

After their position relative to axillary artery

Question 26

The musculocutaneous nerve contains fibers from which two ventral rami?

Answer 26

C5, C6

Question 27

The median nerve contains fibers from which ventral rami?

Answer 27

C5-T1

Question 28

The ulnar nerve contains fibers from which ventral rami?

Answer 28

C8-T1

Question 29

The median nerve contains nerve fibers from which ventral rami?

Answer 29

C5-T1

Question 30

the axillary nerve contains fibers from which ventral rami?

Answer 30

C5, C6

Question 31

The radial nerve contains fibers from which ventral rami?

Answer 31

C5-T1

Question 32

Which nerves supply the anterior compartment of the upper limb?

Answer 32

Musculocutaneous, median, and ulnar

Question 33

Which nerves supply the posterior compartments of the upper limb?

Answer 33

axillary and radial nerves

Question 34

Which two nerves supply motor innervation to the the anteior compartment of the forarm and palm?

Answer 34

Median (C5-T1) and Ulnar (C8, T1) nerves

Question 35

Which nerves supply motor innervation to the anterior compartment of the arm?

Answer 35

Musculocutaneous

Question 36

The radial nerve exits to the posterior compartment through...

Answer 36

triangular interval

Question 37

Where can the 3 subscapular nerves be located?

Answer 37

ventral surface of the subscapularis muscle

Question 38

What is unique about the innervation of serratus anterior?

Answer 38

The long thoracic n. runs superficially along its surface

Question 39

When might the long thoracic n. be compromised?

Answer 39

during surgery near the anterior chest wall (masectomy)

Question 40

Indication that long thoracic nerve has been severed in mastectomy?

Answer 40

weakness when brushing hair

Question 41

the superior (supreme) thoracic artery supplies which region(s)?

Answer 41

upper regions of the medial and anterior axillary walls.

Question 42

Thoracoacromial trunk and its branches supply which muscles?

Answer 42

those on the anterior axillary wall.

Question 43

The lateral thoracic artery supplies...

Answer 43

mammary gland and serratus anterior. (travels w/ long thoracic n.)

Question 44

Posterior circumflex humeral artery

Answer 44

around surgical neck of humerus

Question 45

anterior humeral circumflex artery

Answer 45

anterior travel around the surgical neck

Question 46

Subscapular artery supplies...

Answer 46

the posterior axiallary wall with its two branches (circumflex scapular artery, thoracodorsal artery)

Question 47

Where is blood supply to the upper limb susceptible to trauma?

Answer 47

Where is is subcutaneous or in a fixed position

Question 48

Fracture of the 1st rib or anterior dislocation of the humeral head may cause trauma to the...

Answer 48

axillary artery

Question 49

What does the dorsal scapular anastamoses refer to?

Answer 49

Collateral circulation around the scapula provided by circumflex scapular --> dorsal scapular, suprascapular arteries

Question 50

Blockage of 1st or 2nd part of axillary will not completely cut off UE blood supply, why?

Answer 50

Blood from suprascapular and dorsal scapular arteries may flow back via circumflex scapular artery to re-enter axillary artery downstream

Question 51

75% of lymph from breast tissue drains into...

Answer 51

axillary lymphatics

Question 52

25% of breast tissue lymph travesls where?

Answer 52

to the parasternal lymph nodes to the other breast