Nervous System Pt. 6 - Autonomic Nervous System Flashcards
What do visceral sensory neurons do?
Apart of the autonomic nervous system and it brings signals back to the brain about subconscious things that have occured
BP drop, HR increase are examples of when visceral sensory neurons in the autonomic nervous system would activate
What can the autonomic motor neurons be divided into?
Parasympathetic and Sympathetic which will effect smooth muscle, cardiac and glands
What are two main differences between the somatic nervous system and autonomic nervous system?
- Voluntary vs involuntary movement
- Autonomic only has synapses
In terms of information going into and leaving the spinal nerves how would you explain the direction of sensory and motor info using the terms visceral sensory info and motor sensory info?
- When we have information going into the spinal nerves, that is the visceral sensory info from the autonomic side comes into the spinal
- When we have information leaving the spinal nerves, that is motor information leaving in the same manner as regular spinal nerves do
Somatic sensory info going in is the same way as visceral sensory info
In the autonomic nervous system there will always be at least two nerves involved in a motor signal. True or false?
True
Single neuron cannot carry signal from brain to the effector
What are the two neurons involved in the autonomic motor neurons called?
Preganglionic neuron & Postganglionic neuron
Why does the somatic nervous system not require synapses to occur before the signal is received by the effector?
In somatic, there is not autonomic ganglion, so there is no need for more than one neuron to pass a signal to. One neuron in itself can pass a signal all the way to an effector (muscle)
How are preganglionic and postganglionic neurons different?
Post ganglionic neurons are unmyelinated
Define Ganglia
A place full of cell bodies specifically in the Peripheral Nervous System waiting for a preganglionic neuron to give them a signal to carry away
Dorsal root ganglia is an example which is in the P.N.S. (not apart of autonomic neurons)
Do Dorsal Root Ganglia have to synapse?
Not specifically; if we were talking about a visceral signal coming in (or a somatic) that requires a synapse to occur from a preganglionic neuron passing its signal to a post ganglionic neuron
Explain the path of the autonomic nervous system in order to send a signal to an effector
- Signal is sent to the spinal cord and out of the motor neuron as a preganglionic neuron
- Preganglionic neuron meets with an autonomic ganglion where it synapses
- Information is then sent to a second neuron (postgangliatic neuron) where it can then go to the effector
How is it possible for an autonomic motor neuron to synapse without requiring two neurons? Explain the process
If the motor neuron synapses to an adrenal gland. Adrenal glands will respond to a preganglionic neuron signal to release hormones and chemicals that will go to the effector
Two main components of the autonomic nervous system are?
Parasympathetic and Sympathetic Divisions
Where do the sympathetic preganglionic neurons originate?
T1-L2 segments of spinal cord
Sympathetic neurons; when they send a signal they cause the fight or flight response
Where in the body do the parasympathetic nerves originate?
- Oculomotor Nerve, Facial Nerve, Glossopharyngeal Nerve & Vagus Nerve (Cranial Nerves)
- S2-S4 segments of spinal cord (Mainly organs in the pelvic region - reproductive and urinary)
Parasympathetic preganglionic neurons are responsible for that “rest and digest” and bringing upon homeostasis
