G6_Intro_to_Visceral_NS_EXAM1

Question 1

Which uses a SINGLE neuron in pathway?

Which uses TWO neurons in pathway?

Answer 1

SINGLE NEURON:
THE 3 SENSORY SYSTEMS:
1. Somatic Afferent & Efferent
2. Visceral Afferent

TWO NEURONS:

1. Visceral Motor Efferent
   - Sympathetic and Parasympathetic

Question 2

Dual is the Rule. 2 Exceptions to the rule? 3 organs of the exception?

Answer 2

-Organs have antagonistic innervation from both SNS and PSNS

Exceptions:

• PARASYMPATHETICS DONT GO TO THE BODY WALL!
• Adrenal gland
• Body Wall structures (arrector pili, sweat/seba. glands, vascular smooth muscle)

Question 3

CRANIAL PORTION of PSNS:

Where is preganglionic and postganglionic cell bodies? What do they innervate? Where does it’s innervation end?

Answer 3

PSNS Uses CN X- VAGUS NERVE
- preganglionic cell bodies in brainstem nucleus
-Postganglionic cell bodies in INTRINSIC GANGLIA
(in/near walls of target organ)
-Innervates visceral organs of Thoracic and abdominal cavities up till the proximal 2/3 of the transverse colon

Question 4

SACRAL PORTION of PSNS:

Where is preganglionic and postganglionic cell bodies? what does it innervate?

Answer 4

Pregang- S2-S4 “sacral parasympathetic nucleus”
- INTERMEDIATE ZONE in gray matter
-the indent on middle left of butterfly
Pregang- travel as pelvic splanchnic nerves
Postgang- Intrinsic ganglia
innervates everything past distal 1/3 of transverse colon
pelvic viscera

Question 5

What is intrinsic ganglia? where found? what uses them?

Answer 5

in or near the walls of target organs

PSNS

Question 6

What is IMLCC? What found here? what part of spinal cord are they found?

Answer 6

Intermediolateral cell column
Pregang neuron cell bodies of SNS
-located T1-L2

Question 7

Where are postganglionic neuronal cell bodies found in the SYMPATHETIC NS?

Answer 7

Paravertebral ganglion- Lateral sides of vertebral body
Prevertebral ganglion (preaortic)- lateral sides of abdominal aorta

Question 8

How do pain signals go back to CNS?

Answer 8

Return via Sympathetic pathway responsponsible for innervating the structure

• pseudounipolar neurons
  Posterior root ganglion of t1-L2

Question 9

How do non-pain signals return to cns?

Answer 9

PSNS pathway responsible for that structure
-Vagus nerve or pelvic splanchnic nerves
inferior ganglion of vagus or posterior root ganglia of s2-s4

Question 10

SYMPATHETIC NS-

What is called? Where pregang cb at?

Answer 10

Thoracolumbar
pregang cb’s T1-L2 AT IMLCC
Postgang cb’s in paravertebral ganglia or prevertebral ganglia

Question 11

PARASYMPATHETIC NS-

What called? where pregang postgang?

Answer 11

Craniosacral
pregang cb’s in Branstem nuclei- uses CNX Vagus
Post gang- intrinsic ganglia (wall of target)
INTERMEDIATE ZONE of gray matter

Question 12

3 pathways for Sympathetic neurons:

Targets in body wall, thoracic viscera, pelvic viscera

Answer 12

1. targets in body wall (arrector pili, vascular sm, sweat/sebaceous glands)- synapse in paravertebral ganglion then rejoin spinal nerve
2. targets in thoracic viscera (heart/lungs)- synapse in paravertebral ganglion then form cardiopulmonary splanchnic nerves
3. Targets in abdominal/pelvic viscera (gi, urogenital)
   - pregang exit paravertebral ganglion and form abdominopelvic splanchnic nerve then synapse in prevertebral ganglion- post gang follow arteries to target

Question 13

3 ways to go:

Body wall, thoracic, pelvic viscera

Answer 13

Body wall- synapse @ Paravertebral ganglia > target

Thoracic- same but postgang out via thoracicsplanchnic nerves>target

Pelvic- travel through paravertebral ganglia and synapse in prevertebral gang>pelvicsplanchnic nerves to target