Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
4 Cards in this Set
- Front
- Back
|
Describe the anatomy of the parasympathetic division |
Craniosacral divison- because the cell bodies of parasympathetic preganglionic neurons are located either within cranial nerve nuclei in the brainstem or within the lateral parts of the gray matter on the sacral region of the spinal cord from S2-S4. Axons of the parasympathetic preganglionic neurons from the brain are in cranial nerves III, VII, IX and X. The axons associated with the sacral region are in pelvic splaninic nerves. The preganglionic axons course through these nerves to terminal ganglia, where they synapse with postganglionic neurons. The terminal ganglia are either near or embedded within the walls of the organs innervated by the parasympathetic neurons. |
|
|
Describe the anatomy of the sympathetic division |
Thorocolumbar division: because the sympathetic preganglionic neurons are associated with the thoracic and lumbar regions of the spinal cord. Specifically the cell bodies of sympathetic preganglionic neurons are in the lateral horns of the spinal cord gray matter between T1-L2. The axons of the preganglionic neurons exit through the ventral roots of spinal nerves T1-L2. These axons course through the spinal nerves for a short distance before they exit the nerves and project to sympathetic ganglia. There are 2 types of sympathetic ganglia: sympathetic chain ganglia and collateral ganglia. The preganglionic axons pass through a short connection between a spinal nerve and the white ramus communcans. Axons of the postganglionic neurons pass through the gray ramus communicans. |
|
|
Define preganglionic neurons |
The ANS has 2 neurons in a series extending between the CNS and the innervated organs. The 1st neuron is the series is the preganglionic neuron. Its cell body is located in the CNS within either the brainstem or the lateral horn of the spinal cord gray matter and its axon (myelinated) extends to an autonomic ganglion outside the the CNS. The autonomic ganglion contains the cell body of the 2nd neuron. (Postganglionic neuron) |
|
|
Define postganglionic neurons |
The axons (unmyelinated) of postganglionic neurons extend from autonomic ganglia to effector organs, where they synapse with their target tissues. Preganglionic neurons synapse with postganglionic neurons in the autonomic ganglia. |
