Thoracic spinal nerves

Question 1

How many thoracic nerve roots does a normal person have?

Answer 1

24 (12 pairs)

Question 2

What will each mixed nerve divide into?

Answer 2

a posterior and anterior primary ramus

Question 3

What does every posterior primary ramus divide into after it projects posteriorward?

Answer 3

medial and lateral branch

Question 4

Which branch of the posterior primary ramus has motor AND sensory function?

Answer 4

both the medial and lateral branches

Question 5

What muscles are supplied by the medial branches of the posterior primary rami of the thoracic spinal nerves?

Answer 5

semispinalis (upper 6), longissimus (lower six), and the multifidi (at every level)

Question 6

What do the medial branches of the posterior primary rami of the thoracic spinal nerves seupply sensory info to?

Answer 6

the skin paraspinally

Question 7

Which branches of the posterior primary rami increase in size from superior to inferior?

Answer 7

lateral branches

Question 8

What muscles are supplied by the lateral branches of the posterior primary rami of the thoracic spinal nerves?

Answer 8

longissimus, iliocostalis, and levator costarum

Question 9

What do the lateral branches of the posterior primary rami of the thoracic spinal nerves supply sensory info to?

Answer 9

skin near the costal angles

Question 10

T/F: the anterior primary rami of thoracic spinal nerves generally follow the course of the rib below the nerve.

Answer 10

False; generally follow course of rib above the nerve

Question 11

The anterior primary ramus of T1 will contribute to the brachial plexus and a smaller branch of T1 will form what nerve?

Answer 11

first intercostal nerve

Question 12

Which anterior primary rami contribute to the intercostobrachial nerve?

Answer 12

T2 and sometimes T1

Question 13

What nerve is a communcation with the medial cutaneous nerve of the arm?

Answer 13

intercostobrachial nerve

Question 14

Each intercostal nerve gives off a lateral cutaneous branch which divides into an anterior branch and a posterior branch. What do these branches supply?

Answer 14

the overlying skin

Question 15

What do intercostal nerves terminate as and what do these terminal branches supply?

Answer 15

anterior cutaneous branches;

the skin close to midline

Question 16

What muscles are supplied by the intercostal nerves?

Answer 16

(TIRE SITE) Transverse abdominal, Internal abdominal oblique, Rectus abdominus, External abdominal oblique, Serratus posterior, Internal intercostals, Transverse thoracis, and External intercostals.

Question 17

What muscles are only supplied by intercostal nerves 7-11?

Answer 17

(TIRE, as in fat belly) Transverse abdominal, Internal abdominal oblique, Rectus abdominus, and External abdominal oblique

Question 18

T/F: the intercostal nerve also supply blood vessels, bones, joints, and ligaments.

Answer 18

True

Question 19

What is the largest of the thoracic nerves?

Answer 19

subcostal nerve (T12)

Question 20

What plexus does the subcostal nerve contribute to?

Answer 20

lumbar plexus

Question 21

How far inferiorly might the skin be supplied by the subcostal nerve?

Answer 21

as far inferior as the superior buttocks

Question 22

How do thoracic nerves communicate with the sympathetic trunk?

Answer 22

by way of both white and gray rami communicans

Question 23

Which thoracic nerves communicate with the sympathetic trunk by way of both white and gray rami communicans?

Answer 23

All of them