Flashcards in 2.2.1. ANS Deck (36)
What does the ANS do?
The ANS controls the body’s internal environment and the functions of organ systems in an involuntary fashion
What are the functional divisions of the ANS
Where do we find splanchnic nerves?
Sacral spinal cord
Where do we find visceral ganglia?
In the organ they innervate
What nerves do we find in the brainstem?
What does the myenteric plexus control?
Peristalsis (coordination of the rhythmic contract-shorten-contract-shorten movement of the muscularis externa
rhythmic contract-shorten-contract-shorten movement of the muscularis externa (moves your bowels to squeeze stuff out of you :) )
What does the submucosalplexus control?
Muscularis mucosae and villi (shortening of villi and a squishing out of nutrients in the crypts and between villi)
Main neurotransmitters for the sympathetic nervous system?
Idea of the sympathetic nervous system.
Fight or flight response and homeostasis
Parasympathetic Nervous System idea
The parasympathetic ANS regulates internal organs or glands and controls the ‘rest and digest’ and ‘feed and breed’ activates of the body when at rest.
Main neurotransmitter of the parasympathetic nervous system
Neurotransmitters of the enteric ANS
Acetylcholine, serotonin and dopamine
What is another name for glia?
Two functions of the PNS?
1. Transmit signals from the CNS to peripheral tissues
2. Receive and transmit information from the environment to the CNS
transmits signals from CNS to peripheral tissues
Receive and transmit information from the environment to the CNS
Peripheral nerve infrastructure
-Axons and their supporting Schwann cells in peripheral nerve are held together by connective tissue and travel in bundles called fascicles
connective bundle sheath that holds a collection of neurons together
Surrounds a fascicle of nerve fibers. Must be rejoined in microsurgery for limb reattachment
Invests single nerve fiber layers; is a layer of delicate connective tissue around the myelin sheath of each myelinated nerve fiber
Where are schwann cells in the CNS?
There aren't any
What do schwann cells do?
schwann cells produce the myelin and enwrap all large diameter axons (>1.0um).
What embryonic layer do Schwann cells come from?
What are the presynaptic neurpns of the brainstem?
What are the presynaptic neurons of the organs?
What are the presynaptic neurons of the sacral spinal cord?
Presynaptic neurons in the cervical and upper lumbar spinal cord?
What does the Enteric ANS control?
The submucosal plexus and the myenteric plexus
What is a ganglia?
a cluster of sensory (e.g. dorsal root ganglia) or autonomic (sympathetic or parasympathetic) neuronal cells bodies
1. Free nerve endings
2. Pacinian Corpuscles
3. Krausener's Corpuscles
4. Meissner's Corpuscles
Free nerve endings
Mechanoreceptor for pressure
Vibration for high frequency at the clitoris and penis
Mechanoreceptor light touch (fingers and lips)