The Arm and Elbow

Question 1

How many roots make up the brachial plexus?

Answer 1

5

Question 2

What is the brachial plexus?

Answer 2

the network of nerves that innervate the arm

Question 3

Where is the brachial plexus located?
neck and axilla

Answer 3

neck and axilla

Question 4

Is the brachial plexus composed of ventral or dorsal rami?

Answer 4

ventral

Question 5

What spinal cord segments make up the brachial plexus?

Answer 5

C5 to T1

Question 6

Describe the nomenclature of spinal nerves in the thoracic, lumbar and sacral regions:

Answer 6

spinal nerves are given the name of the vertebrae they are found under

Question 7

Describe the nomenclature of spinal nerves in the cervical region:

Answer 7

as a nerve travels over the C1 vertebrae, this nerve is called C1 and all successive nerves are called C2, C3 etc

Question 8

True or false: there is a C8 spinal nerve despite no C8 vertebrae existing

Answer 8

true

Question 9

What structure do the spinal nerve leave through in vertebrae?

Answer 9

intervertebral foramen

Question 10

Do anterior rootlets from the spinal cord carry sensory or motor information?

Answer 10

motor information

Question 11

Do posterior rootlets from the spinal cord carry sensory or motor information?

Answer 11

sensory information

Question 12

True or false: the spinal nerve itself contains both motor and sensory information

Answer 12

true

Question 13

What two structures does the spinal nerve split into?

Answer 13

1) anterior ramus
2) posterior ramus

Question 14

What region of the body do the posterior rami of spinal nerves supply?

Answer 14

structures posterior to the vertebral column

Question 15

What region of the body do the anterior rami of spinal nerves supply?

Answer 15

structures anterior to the vertebral column

Question 16

Why is are anterior rami of spinal nerves larger than posterior rami?

Answer 16

anterior rami innervate more structures (since more structures are found anterior to the vertebral column)

Question 17

Do anterior or posterior rami of C5-T1 bundle together to form the brachial plexus?

Answer 17

anterior rami

Question 18

What two spinal nerves join to form the superior trunk of the brachial plexus?

Answer 18

C5 and C6

Question 19

What spinal nerve goes onto form the middle trunk of the brachial plexus alone?

Answer 19

C7

Question 20

What spinal nerves join to form the inferior trunk of the brachial plexus?

Answer 20

C8 and T1