What are the 3 parts of the ANS?
Sympathetic, Parasympathetic, and Enteric
The ANS is located in what division of the nervous system?
Peripheral Nervous System
Is the ANS sensory or motor within the PNS?
Motor
How many motor neurons does it take, (in the somatic) to reach its target / effector organ?
1 (somatic motor fibers / alpha motor neuron)
The PNS is divided into motor and sensory. The motor part of the PNS is divided into what?
ANS and somatic
Where does the somatic nervous system originate from in the spinal cord?
Anterior horn of the spinal cord (ventral horn)
What are the target organs of the somatic nervous system?
Skeletal muscles
What neurotransmitter does the somatic system release?
Acetylcholine
How many motor neurons in the ANS does it take to reach its target / effector organ?
2
What is the pathway of a motor neuron of the ANS?
Pre-ganglionic to ganglion to post-ganglionic
Where do pre-ganglionic neurons originate in both somatic and ANS?
Brainstem and spinal cord
What is the target of the pre-ganglion?
Synapses on the ganglion
What is the origin of the post-ganglionic neuron?
Ganglion
What are the target organs of the post-ganglion in the ANS?
Effector organs (skeletal muscles, viscera, glands, etc.)
Describe the sympathetic motor neuron.
The pre-ganglionic motor neuron is short, and releases acetylcholine on the ganglion and the post-ganglion is long and releases norepinephrine.
Describe the parasympathetic motor neuron.
The pre-ganglion is long and releases acetylcholine on the ganglion and the post-ganglion is short and releases acetylcholine.
What is a ganglion?
A group of cell bodies in the PNS
What is a splanchnic nerve?
nerves of the sympathetic part of the ANS that innervates the viscera and blood vessels
What does the SNS do?
Flight or flight
What is the location of the SNS?
Thoracolumbar (T1-L2) of the spinal cord.
What does the PSNS do?
Rest and digest
What is the location of the PSNS?
Brainstem (CN 3, 7, 9, 10) and Craniosacral (S2-S4).
What is the origin (nucleus) of CN3 of the PSNS?
Edinger-Westphal nucleus
What is the origin (nucleus) of the facial nerve (CN 7) of the PSNS?
Superior salivatory nucleus
