PNS Autonomic Flashcards
Autonomic plexus
Cardiac ** Plays a role modulating heart rate. Buried between the aortic arch. Parasympathetic innervation.
Esophageal
Thoracid
Prevertebral
Enteric ** Contains myenteric and submucosal plexuses
3 cervical ganglia and where do they go
- Superior - sympathetic innervation to the head/eyes
- Middle - sympathetic innervation to the heart
- Inferior - sympathetic innervation to the heart
Enteric Nervous System
Subdivision of the ANS.
Plays a role of peristalsis AKA motility, glandular substance secretion into the GI tract, absorption of minerals and nutrients from the GI tract, and blood flow.
2 plexuses make up the enteric system- The submucosal (inner) and myenteric (outer)
2 plexuses that make up the enteric system
The submucosal (inner) and myenteric (outer)
The enteric system can or can’t function without parasympathetic innervation?
Can. Not as efficiently
Cholinergic receptor is for
Ach. Can either be nicotinic or muscarinic
Adrenergic receptor is for
epi or NE
Where do sympathetic motor fibers exit the CNS from?
Thoracolumbar region
From T1-L2
Where do parasympathetic motor fibers exit the CNS from?
Exits along with cranial nerves and the sacral portion of the spinal cord, or craniosacral
Preganglionic nerurons
Cell bodies that reside within the CNS. Axons exit spinal cord ventrally with somatic motor neurons and synapse with postganglionic neurons in the PNS ganglia.
Postganglionic neurons
Cell bodies within PNS ganglia
Axons innervate effector
Examples of visceral sensory fubers
- Baroreceptors (type of mechanoreceptor that detects pressure changes in the major arteries)
- Chemoreceptors detect levels of O2 and Co2 in the blood.
- Nociceptors in the GI tract.
Mydriasis
Dilation of pupil. Occurs under sympathetic nervous system
Meiosis
Constriction of pupil. Occurs under parasympathetic nervous system.
Terms for increased heart rate and decreased heart rate
Tachycardia and bradycardia
