Autonomic Nervous System (Ch 18) Flashcards Preview

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Flashcards in Autonomic Nervous System (Ch 18) Deck (10):
1

ANS and functions

--> general visceral motor system of PNS
-involuntary control of visceral functions, regulates smooth muscles, cardiac muscles, and glands
-regulates heart rate, breathing, body temp, and other functions vital to maintaining homeostasis
*controls all "routine" functions of physiological systems

2

Somatic vs. Autonomic

Somatic:
-ONE neuron in pathway
-from skin/special senses to skeletal muscle
Autonomic:
-TWO neurons in pathway
-from viscera to smooth/cardiac muscle

3

Sympathetic and Parasympathetic

-most organs/glands receive input from both regions
-sympathetic = activation
-parasympathetic = inhibition

4

Sympathetic

"Thoracolumbar"
-for emergencies, exercise, excitement
--> dilate pupils, inhibit bladder contractions

5

Parasympathetic

"Craniosacral"
-normal everyday functioning
--> "housekeeping," slow HR, relaxation, urination, digest food

6

Sympathetic Trunk

a.k.a. Paravertebral Ganglia
-along both sides of vertebral column from neck to pelvis
-connect to ventral rami by rami communicans (white rami are lateral to grey rami, approx 1 per spinal nerve)
-different pathway for autonomic nerves to reach their target (ex. the heart)

7

Spinal Nerves: Roots

emerge from spinal cord = ventral/dorsal roots --> form spinal nerves

8

Ventral Roots

contain only motor axons (carry motor info)
-motor neuron cell bodies are in ventral horn

9

Dorsal Roots

contain sensory axons only (carry sensory info)
-sensory axon cell bodies are in dorsal root ganglion

10

Spinal Nerves: Rami

spinal nerves travel through intervertebral foramen
-->after that they split into ventral/dorsal rami (carry sensory + motor neurons)

1. Ventral Rami: form plexuses
2. Dorsal Rami: innervate small strip of back