Thoracic Nerves

Question 1

The Intercostal Nerves arise from which spinal cord levels?

Answer 1

T1-T11 (T12 is subcostal)

Question 2

The twelfth thoracic nerve is called?

Answer 2

Subcostal Nerve

Question 3

The intercostal nerves arise from?

Answer 3

Thoracic Ventral Rami

Question 4

The Thoracic Ventral Rami innervate?

Answer 4

The Intercostal Nerves

Question 5

The Intercostal Nerves innervate?

Answer 5

Skin and muscles of thoracic and abdominal wall

Question 6

The Intercostal Nerves terminate?

Answer 6

Thoracic and abdominal wall

Question 7

Which intercostal nerves run inferiorly to the abdominal wall?

Answer 7

T6-T11 nerves (and T12 subcostal nerve) continue inferiorly to the abdominal wall.

Question 8

Which intercostal nerves connect to the sympathetic chain? What is their function?

Answer 8

T6-T11 nerves (and T12 subcostal nerve)
Allows passage of sympathetic efferent neurons to glands in skin.

Question 9

the Phrenic Nerve arises from what spinal cord levels?

Answer 9

C3-C5

Question 10

What is the source of the Phrenic Nerves?

Answer 10

Cervical plexus (ventral rami of cervical spinal nerves)

Question 11

What is the destination of the Phrenic Nerve?

Answer 11

Diaphragm

Question 12

What does the Phrenic Nerve innervate?

Answer 12

Parietal pleura along mediastinum and diaphragm, fibrous/parietal pericardial sac, diaphragm

Question 13

The phrenic nerve can be seen traveling?

Answer 13

Courses anterior to hilum of lung along fibrous pericardium

Question 14

The source of the vagus nerve?

Answer 14

Medulla of brainstem

Question 15

The vagus nerve terminates?

Answer 15

Neck, thorax, abdomen

Question 16

The vagus nerve innervates?

Answer 16

Viscera of neck, thorax, abdomen. Terminates at junction between midgut and hindgut (around splenic flexure).

Question 17

What fibers run within the vagus nerve?

Answer 17

1. Parasympathetic efferent (motor) fibers.
2. Afferent (sensory) visceral fibers that play a role in unconscious reflexive control of viscera. Feelings of “unwellness” are detected by these sensory fibers.

Question 18

The Recurrent laryngeal branches arise from which nerve?

Answer 18

Vagus Nerve

Question 19

Recurrent laryngeal branches of vagus nerve
terminate?

Answer 19

Larynx

Question 20

Recurrent laryngeal branches of vagus nerve innervate?

Answer 20

Muscles of the larynx, the lining of the larynx

Question 21

the Left branch of the Recurrent laryngeal nerves travels?

Answer 21

passes under aortic arch

Question 22

the Right branch of the Recurrent laryngeal nerves travels

Answer 22

right branch passes under right subclavian artery

Question 23

The thoracic sympathetic chain arises from which spinal cord levels?

Answer 23

T1-T12

Question 24

What is the source of the thoracic sympathetic chain?

Answer 24

Thoracic Spinal Nerves

Question 25

The thoracic sympathetic chain terminates/are destined for?

Answer 25

Peripheral sympathetic fibers that follow peripheral nerves to glands and vasculature of periphery (e.g. arteries to limb muscles, sweat glands), splanchnic fibers to viscera

Question 26

Thoracic Sympathetic Chain innervates?

Answer 26

Glands and viscera of head, neck, thorax, abdomen

Question 27

Greater thoracic splanchnic nerves arise from which spinal cord levels?

Answer 27

T5-T9

Question 28

Greater thoracic splanchnic nerves terminate/are destined for?

Answer 28

Celiac ganglion and superior mesenteric ganglion

Question 29

Greater thoracic splanchnic nerves innervate?

Answer 29

Pre-aortic ganglia which have fibers linking to abdominal viscera (foregut, midgut)

Question 30

How do the greater thoracic splanchnic nerves travel?

Answer 30

Fibers project inferomedially to pass behind diaphragm to get to gut viscera

Question 31

What is the source of the greater thoracic splanchnic nerves?

Answer 31

Thoracic sympathetic chain