Thoracic Spinal Nerves

Question 1

How many pairs of thoracic spinal nerves?

Answer 1

12 pairs

Question 2

Each mixed thoracic nerve will divide into what?

Answer 2

Posterior and anterior primary ramus

Question 3

The posterior primary ramus projects where and divides into what?

Answer 3

posteriorward

Medial and lateral branch

Question 4

The medial branches of the posterior primary ramus have what type of function?

Answer 4

Motor AND sensory

Question 5

What are the muscles supplies by the medial branches of the posterior primary rami?

Answer 5

semispinalis
longissimus
multifidi

Question 6

The medial branches of the posterior primary rami provide sensory to what?

Answer 6

Skin paraspinally

Question 7

The lateral branches of the posterior primary rami increase in size from ______ to ______. Why?

Answer 7

Superior to inferior

Because area of skin increases as ribs get longer

Question 8

What type of information is carried in the lateral branches of the posterior primary rami?

Answer 8

Motor AND sensory

Question 9

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

Answer 9

longissimus
iliocostalis
Lavatory costarum

Question 10

The sensory area supplied by the lateral branches of the posterior primary rami is?

Answer 10

Skin near the costal angles

Question 11

The anterior primary ramus of T1 will contribute to what plexus?

Answer 11

Brachial plexus

Question 12

A smaller branch of anterior primary ramus of T1 will form what nerve?

Answer 12

First intercostal nerve

Question 13

The anterior primary rami of T2 and T1` (sometimes) contribute to what nerve?

Answer 13

Intercostobrachial nerve (from medial cutaneous nerve of arm)

Question 14

Are the contributions of T1 and T2 instead of the intercostal nerves?

Answer 14

NO they are contributions to the intercostal nerves

Question 15

Each intercostal nerve gives off what?

Answer 15

A lateral cutaneous branch

Question 16

The lateral cutaneous branch of the intercostal nerves divides into what?

Answer 16

Anterior branch and posterior branch

Question 17

These branches of the intercostal nerves supply what?

Answer 17

Overlying skin

Question 18

Intercostal nerves terminate as What?

Answer 18

Anterior cutaneous branches

Question 19

The anterior cutaneous branches of intercostal nerves supply what?

Answer 19

Skin close to midline

Question 20

The intercostal nerves give off a number of muscular branches along the course of their adjacent ribs supplying what rib muscles?

Answer 20

Internal intercostal
External intercostal
Innermost intercostal
Serratus posterior
transversus thoracis

Question 21

The intercostal nerves give of a number of muscular branches along the course of their adjacent ribs supplying what abdominal muscles?

Answer 21

Transverse abdomens
Internal & external abdominal oblique
Rectus abdominus

Question 22

The intercostal nerves will also supply what ?

Answer 22

Blood vessels, bones, joints, and ligaments

Question 23

What is the largest thoracic nerve?

Answer 23

The subcostal nerve

Question 24

The subcostal nerve also contributes to what plexus?

Answer 24

Lumbar plexus

Question 25

The subcostal nerve may supply skin as far inferior as the____?

Answer 25

buttocks

Question 26

Each thoracic nerve communicates with the _______? By way of what?

Answer 26

Sympathetic trunk

Gray and white rami communicans

Question 27

Gray rami communicans are seen at what thoracic levels?

Answer 27

ALL of them (all spinal levels)

Question 28

White rami communicans are seen at what thoracic levels?

Answer 28

T1-L2 - all thoracic levels

Question 29

The white rami communicans synapses how?

Answer 29

Up and down

Question 30

The white rami communicans pass through what nerves?

Answer 30

splanchnic

Question 31

The gray rami communicans synapse through where?

Answer 31

1) posterior primary rami
2) anterior primary rami
3) recurrent meningeal nerve