7. Autonomic Reflex Pathways: Schema

Question 1

What does this schema show?

Answer 1

This schema shows the general pattern for sympathetic and parasympathetic innervation of abdominal viscera.

Question 2

Identify

Answer 2

1. Spinal ganglion
2. White ramus communicans
3. Gray ramus communicans
4. Ganglion of sympathetic trunk
5. Superior mesenteric ganglion
6. Celiac ganglion
7. Vagus nerve (CN X)
8. Anterior root
9. Intermediolateral cell column

Question 3

Autonomic Reflex Pathways: Schema
-> DESCRIBE Sympathetic

Answer 3

Preganglionic sympathetic fibers can synapse in ganglia of the sympathetic trunk, course via splanchnic nerves to synapse in collateral ganglia such as the celiac or superior mesenteric ganglion (this example), or pass directly to the adrenal medulla (not shown).

Question 4

Autonomic Reflex Pathways: Schema
-> DESCRIBE Parasympathetic

Answer 4

Parasympathetic fibers to the upper two-thirds of the abdominal viscera are conveyed by the vagus nerve, which sends preganglionic fibers directly to the walls of the organs innervated. These fibers end in terminal ganglia in the visceral wall, which give rise to short postganglionic fibers.

Question 5

Autonomic Reflex Pathways: Schema
-> Preganglionic sympathetic fibers can synapse in (1)___, course via (2)___ to synapse in (3)___ (this example), or pass directly to the (4)__ (not shown).

Answer 5

1. ganglia of the sympathetic trunk
2. splanchnic nerves
3. collateral ganglia such as the celiac or superior mesenteric ganglion
4. adrenal medulla

Question 6

Autonomic Reflex Pathways: Schema
→ Parasympathetic fibers to the upper two-thirds of the abdominal viscera are conveyed by the (1)___, which sends (2)___ directly to the (3)___ These fibers end in terminal ganglia in the (4)___, which give rise to short (5)___

Answer 6

1. vagus nerve
2. preganglionic fibers
3. walls of the organs innervated.
4. visceral wall
5. postganglionic fibers.