CH 3: Nevous System Flashcards
Conducting cells of the nervous system, normally do not divide non-mitotic, never form tumors
Neurons
Study of nervous system
Neurology
Supporting cells nervous system, mitotic, numerous, cancerous
Neuroglia
Bundle of axons
Nerve
Tumor caused by neuroglia
Glioma
The central nervous system consists of
Brain and spine
Nervous system consists of
Outside of the brain and spine
Hierarchy of peripheral nervous system
P
- afferent division
- efferent division
- somatic nervous system
- autonomic nervous system
- sympathetic division
- parasympathetic division
- sensory nerve fibers
- conducts impulses from receptor cells
Afferent division
- Motor nerve fibers
- conducts impulses from CNS to effectors.
Efferent division ; somatic nervous system.
- voluntary
- from Cn to skeletal muscle.
Somatic nervous system.
Involuntary
From CNS to cardiac muscles, smooth, muscle, and gland.
Autonomic nervous system
Often the accelerator
The brake
Autonomic nervous system./
- sympathetic division
- parasympathetic division
Carries impulse to soma
Dendrite
Carries impulse away from soma
Axon
Cell body
Soma
Where axon joins a soma
Axon hillock
A branch off main axon
Axon collateral
Found at the end of each axon and collateral axon
Axon terminal
Space between neurons
Synapse
At axon terminal; stores neurotransmitter
Synaptic end bulb
Cytoplasm in axon
Axoplasm
Plasma membrane of axon
Axolemma
Neuroglia
A.) CNS Neuroglia
1. : phagocytosis (engulf debris)
2.: secrete/circulate csf around brain.
3.: form blood brain barrier
4.: form myelin sheath on CNS axons, can’t repair itself.
B.) PNS Neuroglia
1.: surround and protect ganglia (groups of somas)
2.: form myelin sheath on PNS axons, can often repair
-_: cytoplasm of Schwann cell
- microglia
- ependymal cells
- astrocytes
- oligodendrocyte
- satellite cell
- Schwann cell
- neurolemma
