Anatomy Neurons
Terms
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- CNS
-
central nervous system
controls muslces and secretion of the glands
brain and spinal cord
thoughts and memories are stored
starts from brain to rest of the body -
PNS
SNS ANS -
peripheral nervous system
the PNS have sensory are afferent neurons
comes from senses to the brain
motor; efferent
from CNS to the Muscles and Glands
SNS-somatic nervous system
takes sensory neurons from the head, body, and limbs to the CNS
and controls skeletal muscles
ANS-autonomic nervous system
control smooth muscle, cardiac muscle, and glands
all involuntary -
ANS
parasympathetic division
sympathetic division -
parts of the ANS are
sympathetic division
-speeds up heart beat
parasympathetic division
-slows heart beat - what is a neuron
- neuron is the path from which impulses travel from the body to the brain
- structure of neuron
-
3 parts
cell body
-collects nerve impulses
dendrite
-take the nerve impulses to the cell bodies
axon
-sends impulses to another neuron or tissue - When it is Afferent how do the impulses travel!?
- first it goes from the dendrite into the cell body into the axon into the brain!
- How do Efferent nerve impulses travel?!
- from the brain to the axon to the cell body!
- neuroglia
-
support the neurons
6 different types:!
4 for CNS
-astrocytes-participate in the metabolism of the neuro transmitters; maintain the proper balance of potassium; participate in brain developement and help form the blood brain barrier
-oligodendrocytes-produce myelin sheaths around axons of neurons of CNS
-Microglia- phagocytic cells that eat and destroy foreign debris in the CNS
-Ependymal-line ventricles of the brain and the central canal of the spinal cord; and forms cerebral spinal fluid
2 for PNS
-neurolemmocytes (schwan cells)- each produces part of the myelin sheath around a single axon of a PNS neuron
-satellite cells- support neurons in ganglia of PNS
ganglia are the little parts at the end - describe the meninges layers
-
inside pia
middle arachnoid
outside dura matter - white matter
-
spinal cord: nerve impulse paths
brain: consists of myelated axons that transmits impulses between gryi in the same hemisphere
transmits impulses between gyri - gray matter
- receives and integrates incoming and out going information