Introduction Flashcards
How many pairs of spinal nerves are there?
31
These are a collection of cell bodies outside the CNS.
Ganglia
These are a collection of cell bodies in the brain.
Nucleus
What is the difference between white and gray matter in the spinal cord?
White matter- myelinated nerve axons
Gray matter- cell bodies
What is the difference between the dorsal root and ventral root?
Dorsal- sensory
Ventral- motor
What are the 2 enlargements of the spinal cord? Why are they enlarged?
Cervical and lumbar
More gray matter= more cell bodies of motor neurons for limb movement
This is a bundle of axons of similar function.
Tract or fasiculus
This is a site where a tract crosses the midline.
Decussation
Which types of neurons exist for the sympathetic and parasympathetic nervous systems?
Sympathetic- catecholarminergic
Parasympathetic- cholinergic
Which are the most important NTs for the sympathetic and parasympathetic nervous systems?
Sympathetic- NE
Parasympathetic- ACh
Describe the cells, receptors and synapses involved in a parasympathetic neural pathway.
Preganglionic neuron–>ACh–>Nicotinic cholinergic receptor on postganglionic neuron–> ACh–> muscarinic cholinergic receptor on effector organ
Describe the cells, receptors and synapses involved in a sympathetic neural pathway.
Preganglionic neuron–> ACh–> Nicotinic cholinergic receptor on postganglionic neuron –> NE –> adrenergic receptor on effector organ
What are the 3 functions of the CSF?
Nutrition
Waste removal
Protection
What is the difference between gyri and sulci?
Gyri- elevations
Sulci- crevasses
True or False. Dendrites and axons are myelinated.
False. Dendrites are NOT myelinated but some axons are.
Where are most synapses formed on axons and dendrites?
Dendritic spines
Which cells myelinate axons in the PNS?
Schwann cells
How many axons does a single PNS glial cell myelinate?
Schwann cells myelinate ONE axon
Which cell myelinates axons in the CNS?
Oligodendrocytes
How many axons does a CNS glial cell myelinate?
Oligodendrocytes myelinate multiple axons
How many pairs of cranial nerves are there?
12
