CTL week 6 Flashcards
in the spine the ______ matter surrounds an inner core of ______ matter.
in the spine the ___white___ matter surrounds an inner core of ___grey___ matter.
Nerve is a bundle of _____ that is located in the ____
Nerve is a bundle of ___axons___ that is located in the ___PNS___
Tract is a bundle of _____ that is located in the ____
Tract is a bundle of ___axons___ that is located in the ___CNS___
Ganglia is a cluster of _________ cell bodies located in the ______
Ganglia is a cluster of ___neuronal___ cell bodies located in the ___PNS___
Nucleus is a cluster of ______ cell bodies located in the ______
Nucleus is a cluster of ___neuronal___ cell bodies located in the ___CNS___
where and what do satellite cells do?
hint: Str su & Reg exc.
where and what do satellite cells do?
Answer:
where: PNS
what:
- structural support
- regulate exchange of materials between neuronal cell bodies and interstitial fluid.
where and what do Schwann cells do?
where and what do Schwann cells do?
Answer:
where: PNS
what: form myelin sheath around axons (1 cell per axon)
[nodes of ranvier: gap in myelin sheath intervals]
where and what do Ependymal cells do?
where and what do Ependymal cells do?
Answer:
where: CNS, line the ventricles of brain and central canal
what:
- assist in the circulation of cerebrospinal fluid
- form blood-cerebrospinal fluid barrier
where and what do Microglial cells do?
where and what do Microglial cells do?
Answer:
Where: CNS
what: function as phagocytes
where and what do Oligodendrocytes cells do?
where and what do Oligodendrocytes cells do?
Answer:
where: CNS
what: form myelin sheath (multilayered lipid & protein) around axons
where and what do Astrocytes cells do?
where and what do Astrocytes cells do?
Answer:
where: CNS
what:
- largest neuroglia
- contain microfilaments (strengthen them to support neurons)
- create blood-barrier brain
what are the 3 functional classification of neurons?
what are the 3 functional classification of neurons?
Answer:
- Sensory (unipolar)
- Motor (multipolar)
- Interneurons (multipolar)
what does the cell body contain that the axon does not contain?
what does the cell body contain that the axon does not contain?
Answer: Nissl bodies (rough ER)
what are neurofibrils?
what are neurofibrils?
Answer: bundles of intermediate filaments that provide the cell shape and support.
(important question)
what is a neuron?
(important question)
what is a neuron?
Answer:
- the cell that has the dendrites, cell body (soma), axons.
- convert stimuli into electrical signals (nerve impulses)
(important question)
what is a neuroglia
(important question)
what is a neuroglia?
Answer:
- smaller cell, but more numerous then neurons
- support, nourish, and protect neurons.
- maintain the interstitial fluid.
in the brain, a thin shell of _____ matter surrounds the _____ matter.
in the brain ___grey___ matter surrounds the ___white___ matter.
Does organisation of grey matter into a cortex allows better access for the soma of neurons to the oxygen and nutrients they require.
The organisation of grey matter into a cortex allows better access for the soma of neurons to the oxygen and nutrients they require.
Answer: yes
Tissues are groups of cells that share _____ & ______ characteristics
Tissues are groups of cells that share ___structural___ & ___functional___ characteristics
which cell type is not found in the grey matter tissue of the nervous system?
which cell type is not found in the grey matter tissue of the nervous system?
Answer: Oligodendrocytes, because they produce myelin which is not found in grey matter.
The organisation of grey matter into a cortex allows better access for the soma (cell body) of neurons to the ______ and ______ that they require.
The organisation of grey matter into a cortex allows better access for the soma of neurons to the ___oxygen___ and ___nutrients___ that they require.
which region of the brain contains the grey matter cortex?
which region of the brain contains the grey matter cortex?
Answer: Cerebellum.
where within a neuron is the action potential initiated?
where within a neuron is the action potential initiated?
Answer: at the axon hillock
which one, graded potential or action potential, is all or nothing?
which one, graded potential or action potential, is all or nothing?
Answer: action potential
do craial nerves of the brainstem only carry psecial sensory information?
do craial nerves of the brainstem only carry psecial sensory information?
Answer: no.
where is the enteric plexuses found?
where is the enteric plexuses found?
Answer: PNS
how many cranial nerves and spinal nerves are there?
how many cranial nerves and spinal nerves are there?
Answer:
Cranial = 12 pairs
Spinal = 31 pairs
what assist in moving materials between cell body?
what assist in moving materials between cell body?
Answer: Microtubules
