Neuroscience Week 5: Autonomic Nervous System Functional Anatomy Flashcards
Major divisions of the autonomic nervous system
- Sympathetic
- Parasympathetic
- Enteric
Sympathetic Nervous System Target Organ Systems
- so sympathetics and parasympathetics there are always 2 neurons and a ganglion
Ganglion Definition
Collection of nerve cell bodies outside the CNS
Basic anatomy of Sympathetics
identify intermedial lateral cell column
Where are the cell bodies of the sympathetic preganglionic neurons located?
in the intermediolateral cell column (IML)
What lies in the intermediolateral cell column?
Cell bodies of sympathetic preganglionic neurons
Where are the Sympathetic Spinal Origins by # of vertebrae
T1 - L2 (Thoraco-Lumbar origins)
Length of Sympathetic Nervous system preganglionic and postganglionic neurons
- Short preganglionic
- Long postganglionic
How does the sympathetic nervous system control the entire body?
The Sympathetic chain or trunk
The Sympathetic chain or trunk
a collection of ganglia for sympathetics because there is not enough room within the spinal cord for the postganglionics which go out to individual organs
The Sympathetic chain or trunk pictures
Sympathetic Routes to different targets
4 listed
- Body wall and limbs
- Head
- Thoracic viscera
- Abdominal viscera
Sympathetic innervation of extremities
Identify
How do preganglionic nerves go to the sympathetic chain
White Ramus communicans
How do postganglionic nerves go back to the spinal nerve?
Gray ramus communicans
Gray Rami Communicans properties, location, and function
White Rami Communicans properties, location, and function
Autonomic innervation of the eye
Starts in IML → travels up the sympathetic chain → to the superior cervical ganglion → follow the branches of the carotid artery to the eye
Identify
Sympathetic innervation of thoracic viscera
Sympathetic innervation of the head: effectors
4 listed
- Eyes
- Blood vessels
- Sweating
- Pilomotion
Identify
Sympathetic innervation of the head: Preganglionics
Sympathetic innervation of the head: preganglionic synapse
Thoracic viscera sympathetic nerves AKA
Splanchnic nerves (cardiopulmonary splanchnic nerves)
Example of sympathetic pathways to abdominal viscera
IML → dont make connections in the sympathetic chain but pass through to the prevertebral ganglion (celiac) and synapse of a postganglionic neuron → gi targets
Abdominal viscera ganglia
Sympathetic innervation of the abdominal viscera
Question 1
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sympathetic dilation of the pupil
prevertebral ganglia of GI tract
aorticorenal does not go to the gut so it follows aorticorenal
The adrenal glands and sympathetic nervous system
Chromaffin cells; basically specialized cells of the sympathetic ganglia through which epinephrine and bloodstream are the effectors, this acts like a ganglion
Para vs prevertebral ganglia
Study guide
Sympathetic innervation of the head: postganglionics
Chromaffin cells are analogous to
postganglionic neurons whose effector is epinephrine
