GA 5

Question 1

Vagus nerve is CN…

Answer 1

X (parasympathetic!!)

Question 2

Phrenic N. is made of…

Answer 2

anterior rami C3-5

• runs right on top of the heart (mediastinal parietal pleura and fibrous pericardium)
• conveys sensory info from central diaphragmatic and mediastinal pleura and pericardium)

Question 3

What are intercostal Ns?

Answer 3

NOT spinal nerves; they’re anterior rami of a spinal nerve

Question 4

What do intercostal Ns supply?

Answer 4

-musculature, diaphragmatic/costal parietal pleura, subcutaneous fat, skin

Question 5

What do the following do for intercostal Ns?

1. Collateral Branches
2. Rami Communicates
3. Lateral Cutaneous branches
4. Anterior cutaneous branches
5. Muscular branches

Answer 5

1. Intercostal m.
2. Connect intercostals to sympathetic trunk
3. Innervate skin (wall), T4-6 (breast); split to ant/post
4. Innervate skin (anterior) , T4-6 (breast)
5. Innervate intercostal m., subcostal, transversus thoracis

Question 6

Which intercostal Ns are typical?

Which are/why are the rest atypical?

Answer 6

1. 3-6
2. 1, 2, 7-11
   a. 1: joins brachial plexus, no cutaneous branches
   b. 2: small part joins brachial plexus, gives intercostobrachial N.
   c. 7-11: enter abdomen–> then are thoracoabdominal Ns

Question 7

Where would you find parasympathetic? sympathetic?

Answer 7

1. Head, neck, trunk viscera never body wall/extremities

2. Everywhere

Question 8

Glandular secretions are done by

Answer 8

parasympathetic (except sweat glands)

Question 9

Vasoconstriction is done by

Answer 9

sympathetic (except coronary arteries)

Question 10

Where can you find the lateral horn?

Answer 10

only in the thoracic region –> why option 2 so other regions can get that innervation

Question 11

Three options of pre-synaptic fibers

Answer 11

1. synapse postsynaptic neuron same level on paravertebral
2. different level but still paravertebral
3. not at all; goes via abdominopelvic splanchnic nerve to a post synaptic neuron in a preverbal ganglion

Question 12

T levels of splanchnic nerves

1. Pulmonary
2. Greater
3. Least
4. Lesser
5. Cardiac

Answer 12

1. 2-3
2. 5-9, 10
3. 12
4. 10-11
5. 1-5, 6

Question 13

Sympathetic vs. Parasympathetic: come from

Answer 13

1. T1-L2

2. CN III, VII, IX, X and S2-4

Question 14

Superior, middle, inferior cardiac branches of the vagus nerve are the same except

Answer 14

superior/middle come from neck, and inferior comes from thorax

Question 15

Vagus nerve makes ___ branch and then becomes indistinguishable from ___

Answer 15

pulmonary; esophageal plexus

Question 16

Sympathetic vs. Parasympathetic for these:

1. Pulmonary Plexus
2. Cardiac Plexus
3. Aortic Plexus
4. Esophageal Plexus

Answer 16

1. S: pulmonary splanchnic ns
   P: Pulmonary branches of vagus n
2. S: cardiac splanchnic ns
   P: Superior, middle, inferior cardiac branches of vagus N
3. S/P: continuous with superficial cardiac plexus
4. S: Greater Splanchnic N and aortic plexus
   P: Esophageal branches of Vagus N.