Week 6- Nervous tissue Flashcards
what is the most common neuron in the NS?
multipolar neuron/ motor neurons
what is a motor neuron?
integrates information from the brain and sends messages to activate the muscles of the body.
efferent
has one axon and multiple dendrites
found in CNS and ANS
sensory neuron?
responds to specific stimuli
is afferent, send message to CNS
name the PNS glial cells?
shwaan cells and satellite cells
name the CNS glial cells?
atrocytes, oligodendrocytes, microglial, ependymal cells
where do glial cells in CNS come from?
neural tube
functions of glial cells?
do not convey electric excitation but they are involved in CNS homeostasis and interactions between neurons, respond to lesions
where do glial cells in the PNS come from ?
the neural crest
astrocytes?
control synapse between neurons
maintain BBB
a role in brain repair following injury
maintain chemical concentration in the EC space
oligodendrocytes?
myelination in the CNS
- branching processes that wrap around neurons
damage can result in multiple sclerosis
microglia?
smallest glial cells
CNS phagocytes that remove cellular debris and damaged cells
can secrete cytokines that inhabit neuron function (immune effector cells in anti-inflammatory type responses)
ependymal?
line the ventricles of the brain and central canal of the spinal cord as cuboidal and columnar cells that join with pia matter to form choroid plexus which
secretes cerebral spinal fluid (this protects brain)
shwaan cells?
myelination for PNS
support and protection
satellite cells
surround cell bodies in ganglia (aggregation of neuron cell bodies)
plays a role in metabolic exchanges between the neurons and surrounding nerve tissue
what does gray matter contain?
neuron cell bodies, neuroglial cells, blood vessels
what does white matter contain?
myelinated axons and neuroglial cells
it provides nerve tracts that connect one part of the brain to another
cerebrum? gray and white matter
gray matter at periphery and inside (nuclei)
6 layer of gray matter
the white matter is located inside around the gray matter
what does it mean when there are more layers to gray matter?
means it more organized and information is processed more efficiently
how is it beneficial to have gray matter on the outside?
the soma is closer to a nutritional source which diffuses and supplies energy to neurons
cerebellum? gray and white matter
gray matter at periphery and centrally, inside is white matter
3 layers of gray matter
cerbrospinal fluid?
found in ventricles of the brain and the space that surrounds the brain and spinal cord
spinal cord? white and grey matter
gray matter is located centrally surrounded by white matter (tracts of myelinated nerves and glial cells)
