LP #102 Autonomic Nervous System

Question 1

ANS 2 division

Answer 1

• Parasympathetic
• Maintains homeostatic functional levels
• Rest & digest
• Sympathetic
• Stimulates emergency & high stress response
• Fight or Flight

Question 2

ANS is _______ only?

Answer 2

Motor

Question 3

NE (Norepinephrine) is secreted by most ____________ fibers

ACh (Acetylcholine) is segregated by ___________

Answer 3

• Sympathetic

* Parasympathetic

Question 4

*Motor unit= ______ + ______ _____/_____

Answer 4

• Neurons

* Muscle cells/ glands

Question 5

• 1 neuron & mm fibres it innervates

* neuron to mm (target organ)

Answer 5

Somatic

Question 6

• 2 neurons in pathway
• pre-ganglionic neuron to ganglion
• synapse with post-ganglionic neuron that goes to target organ

Answer 6

ANS

Question 7

• a.k.a Craniosacral division
• nurons originate in:
• brain stem & sacral region of SC

Answer 7

Parasympathetic division

Question 8

Motor unit:

• pre-ganglionic fibres=
• ganglion=
• post-ganglion is fibres=

Answer 8

• Very long
• Close to target organ
• Very short; innervate target organ

Question 9

Cranial outflow:

Parasympathetic signals leave brain stem via 1 of 4 cranial nn?

Answer 9

CN III (Oculomotor) 
CN VII (Facial) 
CN IX (Glossopharyngeal) 
CN X (Vagus)

Question 10

• Sphincter mms of eyes

- Constriction of pupils

Answer 10

CN III Oculomotor

Question 11

• Major secretory glands in head: lacrimal (eye), submandibular & sublingual
• innervates secretory cells of nasal mucosa

Answer 11

CN VII facial

Question 12

-Parotid glad (salivary)

Answer 12

CN IX glossopharyngeal

Question 13

• Extracranial course (extends into thorax)
• Largest parasympathetic nerve
• ~90% of parasympathetic Innervation
• Innervates internal organs
• exceptions: large intestine & pelvic organs

Answer 13

CN X vagus

Question 14

4 key parasympathetic ganglia

Answer 14

• ciliary ganglia
• pterygopalatine ganglia
• submandibular ganglia
• otic ganglia

Question 15

• Within orbits

- pre-ganglionic neurons are from Oculomotor nn (CN III)

Answer 15

Ciliary ganglia

Question 16

• just posterior to maxillae

- pre-ganglionic neurons originate in pons (CN VII)

Answer 16

Pterygopalatine ganglia

Question 17

• deep to mandibular angles

- pre-ganglionic neurons originate in pons

Answer 17

Submandibular ganglia

Question 18

• just inferior to skull

- pre-ganglionic fibres are from glossopharyngeal nn (CN IX)

Answer 18

Otic ganglia

Question 19

• Originates in sacral spinal cord segments S2-S4
• Nerves from pelvic splanchnic (visceral) nerves
• innervates distal 1/2 of large intestine & pelvic viscera
• synapse on ganglia close to target organs

Answer 19

Sacral outflow