Brachial Plexus - Part 1

Question 1

The brachial plexus if formed by what?

Answer 1

Anterior primary rami of C5-T1

Question 2

The brachial plexus can also receive fibers from what?

Answer 2

C4 and/or T2

Question 3

The brachial plexus travels laterally over what?

Answer 3

Rib 1

Question 4

After traveling laterally over rib 1, the brachial plexus enters what?

Answer 4

The axilla

Question 5

Traveling medial to lateral, roots _____ to form what?

Answer 5

combine

trunks

Question 6

Traveling medial to lateral, trunks _____ to form what?

Answer 6

divide

divisions

Question 7

Traveling medial to lateral, divisions ____ to form what?

Answer 7

Combine

cords

Question 8

Traveling medial to lateral, cords ____ into what?

Answer 8

divide

Terminal nerves

Question 9

Each root receives what? From where?

Answer 9

Gray ramus communicans

Sympathetic trunk

Question 10

How many cervical sympathetic ganglia are there? Names?

Answer 10

3, superior, medial, inferior

Question 11

The roots pass between what? Into what?

Answer 11

Anterior and middle scalene muscles

Posterior triangle

Question 12

The roots are _____ and _____ to what structure?

Answer 12

Posterior and superior

subclavian artery

Question 13

What combines to form the superior trunk?

Answer 13

C5 and C6

Question 14

What combines to form the middle trunk?

Answer 14

C7 - stays alone

Question 15

What combines to form the inferior trunk?

Answer 15

C8 and T1

Question 16

Trunks pass over what?

Answer 16

Rib 1

Question 17

The trunks pass over rib 1 into what?

Answer 17

axilla

Question 18

At which part of the brachial plexus does it become compartmentalized?

Answer 18

divisions

Question 19

Each trunk splits into what?

Answer 19

An anterior and posterior division

Question 20

Anterior division supply what?

Answer 20

Anterior compartment of arm

Question 21

Posterior division will supply what?

Answer 21

Posterior compartment of the arm

Question 22

What are the cords named for?

Answer 22

Relationship to axillary artery

Question 23

This cord is formed by the anterior divisions of the superior and middle trunk.

Answer 23

Lateral cord

Question 24

The lateral cord contains fibers from what?

Answer 24

C5, C6, C7

Question 25

The lateral cord lies lateral to what?

Answer 25

Second part of the axillary artery

Question 26

The medial cord is formed by what?

Answer 26

The anterior division of the inferior trunk

Question 27

The medial cord contains fibers from which nerves?

Answer 27

C8 and T1

Question 28

The medial cord lies _____ to the axillary artery

Answer 28

medial

Question 29

The posterior cord is formed by union of what?

Answer 29

Posterior division of all three trunks

Question 30

The posterior cord contains fibers from which nerves?

Answer 30

C5-C8, T1

Question 31

The posterior cord lies _____ to the axillary artery.

Answer 31

posterior

Question 32

What two nerves are formed from roots of the brachial plexus?

Answer 32

Dorsal scapular nerve | Long thoracic nerve

Question 33

The dorsal scapular nerve branches off what?

Answer 33

The C5 root

Question 34

The dorsal scapular nerve contains fibers from ?

Answer 34

C5 only

Question 35

The dorsal scapular nerve supplies three muscles.

Answer 35

levator scapular rhomboid major Rhomboid minor

Question 36

Rhomboid major is supplied by dorsal scapular nerve but also receives fibers from what nerves?

Answer 36

C3 and C4

Question 37

The long thoracic nerve is formed by what?

Answer 37

The roots of C5, C6, and C7

Question 38

The long thoracic nerve contains fibers from what nerves?

Answer 38

C5, C6, C7

Question 39

The long thoracic nerve supplies which muscle?

Answer 39

serratus anterior

Question 40

What two nerves branch off of the superior trunk?

Answer 40

suprascapular nerve | Nerve to the subclavius