ANS And Its Central Control Flashcards
1
Q
- Visceral Motor System (new term): provides motor control of the viscera
- Vegetative Nervous System (old term)
A
AUTONOMIC NERVOUS SYSTEM
2
Q
AUTONOMIC NERVOUS SYSTEM functions:
A
- Maintain constant internal environment or homeostasis: issue commands that leads to compensatory actions
- Regarded as part of the motor system
- Appropriate coordinated response to external stimuli (e.g. helps regulate pupil size in response to different intensities of ambient light, helping the visual system to operate over large range of light intensities)
3
Q
- Maintain constant internal environment or homeostasis: issue commands that leads to compensatory actions
A
- Mediates visceral reflexes (e.g. gastrocolic reflex, where stomach distention triggers peristalsis in the intestines) and provides sensory information to the CNS for the state of our viscera.
- Activation of autonomic receptors evoke sensory experiences (e.g. pain, hunger, thirst, nausea and sense of visceral distention)
4
Q
- Regarded as part of the motor system
A
- Effectors: smooth muscles, cardiac muscles and glands
- Autonomic fibers in peripheral nerves are accompanied by visceral after end fibers originating from visceral sensory receptors in the viscera.
- Receptors triggers reflexes and evokes sensory experiences such as pain, hunger, thirst, nausea and sense of visceral distention.
5
Q
- Appropriate coordinated response to external stimuli (e.g. helps regulate pupil size in response to different intensities of ambient light, helping the visual system to operate over large range of light intensities)
A
• FIGHT OR FLIGHT: response to threatening activities
6
Q
ORGANIZATION of ANS
A
Two-Neuron Motor Pathway
7
Q
Primary functional unit of Sympathetic and
Parasympathetic NS
A
Preganglionic
Postganglionic
8
Q
The cell body is in the CNS
A
Preganglionic
9
Q
The cell body is in one of the autonomic ganglia
A
Postganglionic
10
Q
SYMPATHETIC NS
A
Preganglionic
Postganglionic
