Autonomic Nervous System

Question 1

-Spinal Nerves-

Give some info on the picture

Answer 1

• Spinal nerves have to send signals to both the anterior and posterior parts of the body
• Each spinal nerve is composed of the dorsal and ventral roots coming together
• Bulge on dorsal root is dorsal root ganglion
• Dorsal contributes sensory innervation, and ventral gives motor

Question 2

-Somatic Nerves-

What is a reflex arc?

Answer 2

• The sense receptor triggers, and fires into the spinal cord, where a synapse allows a quick response

Question 3

-Autonomic Nervous Sysem-

• What types of fibres?
• Innervates what?
• Conscious or unconscious control?

Answer 3

• Afferent and Efferent fibres
• Viscera, smooth muscle, cardiac muscle and glands
• Non-conscious control

Question 4

-Parasympathetic Nervous System-

• Comes from?
• What does it do?
• What nerves are involved?

Answer 4

• Cranial and Sacral regions
• Rest and digest. Slows heart and breathing rate and increases intestinal motility
• Cranial nerves III, VII, IX and X

Question 5

-Sympathetic Nervous System-

Sympathetic Nervous System

Answer 5

• Gives the fight or flight response - Cell bodies are in the lateral horn of the spinal cord between T1 and L1/2 - Sympathetic chain has ganglia either side of spinal cord. Innervates outside of T1-L1. White ramus comminicans are T1-L1 and grey are at every level.

Question 6

-Pain in the ANS-

• How is the pain interperated?

Answer 6

• The pain is interperated as in the spinal area
• Referred pain to the body wall rather than to the exact spot
• Knowing which areas refer pain to where can help you estimate where the damage is

Question 7

-Enteric Nervous System-

What is the enteric nervous system?

Answer 7

• The gut’s own nervous system. It is regulated by the ANS but is capable of independent function