Histology of nervous tissue chp 15
location of the CT covering endoneurium
additional sheath that surround the myelin sheath (delicate)
which neuron type is unipolar
afferent (sensory)
Neuron that conducts impulses toward the CNS from the body periphery
afferent neuron (sensory neuron)
controls the chemical environment around neurons in the CNS
astrocytes
impulse generator and transmitter
axon
region of the cell body from which the axon originates
axon hillock
secretes neurotransmitters
axon terminal
what is a nerve
bundles of axons in the PNS
site of the nucleus and most important metabolic area
cell body
essentially rough endoplasmic reticulum, important metabolically
chromatophilic substance
receptive region of a neuron (2 terms)
dendrites and cell body
which neuron type is multipolar
efferent (motor) and interneuron
Neuron that conducts impulses away from the CNS to muscles and glands
efferent neuron (motor neuron)
lines CSF filled cavities
ependymal cells
collection of neuron cell bodies in the PNS
ganglion
location of the CT covering perineurium
groups of bundles are bound by this to form fascicles (coarser)
describe how schawn cells form the myelin sheath encasing the nerve fibers
heavily myelinated supporting cells called schawn cells wrap themselves around the axon in a jelly roll fashion
Neuron serving as part of the conduction pathway between sensory and motor neurons
interneuron
Acts as phagocyte in the CNS
microglial cells
insulates the nerve fiber
myelin sheath
bundle of axons in PNS
nerve
define mixed nerve
nerves carrying both sensory (afferent) and motor (efferent) fibers most nerves of the body all spinal nerves
involved in the transport of substances within the neuron
neurofibril
specialized supporting cells in the nervous system
neuroglia
substance found in synaptic vesicles of the axon terminal
neurotransmitter
chemicals related by neurons that stimulate or inhibit mother neurons or effectors
neurotransmitters
collection of neuron cell bodies found within the CNS
nucleus
forms the myelin sheath in the CNS
oligodendrocytes
Ganglia and spinal and cranial nerves
peripheral nervous system (PNS)
what is the function of the connective tissue wrappings found in a nerve
protect and insulate delicate nerve fibers
surrounds the cell body of a neuron found in the PNS
satellite cells
junction or point of close contact between neurons
synaptic cleft
what anatomical characteristics determines whether a particular neuron is classified as unipolar, bipolar, or multipolar
the # of processes attached to the cell body
bundle of axons inside the CNS
tract
what is the major function of the neuron
transmit messages from one part of the body to the other in the form of nerve impulses
location of the CT covering epineurium
white fibrous CT that bound fascicles together
the brain and the spinal cord collectively
Central Nervous System (CNS)
forms the myelin sheath in the PNS
Schwann cells