Histo. nervous tissue Flashcards
Nerves arising from the brain are called the _____
cranial nerves
Nerves have two physiological properties:
excitability & conductivity
The SNS have that two fxn divisions
somatic sensory division
somatic motor division
ANS has what three fxn divisions
visceral sensory division (afferent) sympathetic division (efferent) Parasympathetic division (efferent)
_______ is the ability to produce action potential in response to a stim.
excitability
______ is the ability to propagate action potential along the neural membrane
conductivity
A receptor can change any stim. to an _________
action potential
Name the 4 special receptors
- see
- hear
- touch
- smell
___ conducts action potential away from the cell body
axons
____ conduct potentials toward the cell body
dendrites
What are the two parts of the neuron that deal with the action potentials
axon: away from cell body
dendrite: toward the cell body
_________ cells that support the nerve cells and their processes
neuroglial cells
Nerve fibers are extensions of _______
neurons
Name the three types of neurons
- Unipolar, pseudounipolar
- bipolar
- multipolar
_____ is a type of neuron with one process
unipolar / pseudounipolar
ganglia contain the ______ mater
grey
_______ is a type of neuron with two process
bipolar
_______ is a type of neuron with more than two process
Multipolar
Name the 4 different types of multipolar neurons
- stellate
- pyramidal
- piriform
- granule cells
What is the shape of stellate multipolar neurons
star shape
ex: autonomic
What is the shape of a piriform multipolar neuron
pear-shaped
ex: cerebeellum
What is the shape of a granule cell of multipolar neurons
small with nucleus filling most of the cell
ex: in cerebellum
Golgi type 1 have _____ axons
long
Golgi type II have _____ axons
short
Golgi type ____ have long axons
type 1
Golgi type ___ have short axons
type II
Axons send electrical stimulus ______
away from the cell body
There is only 1
Dendrites send electrical stimulus _____
to the cell body
there are many
_______ are sites of contact btw nerve cells or nerve cells and end organ
synapse
What are synapse
sites of contact btw nerve cells or nerve cells and end organs
Name the three types of synapse
- axodentrite
- axosomatic
- axoaxonic
_____ contain chemical neurotransmitters that release under the effect of the presynaptic action potential
synaptic vesicles
_____ facilitate transmission of electrical energy from the presynaptic to the postsynaptic element
synaptic vesicles
Where are unipolar/ pseudounipolar neurons located?
spinal gg.
Where are bipolar neurons located ?
the retina
Myelin sheaths are divided into internodal segments by _____
nodes of ranvier
2 fxn of the myelin sheath
- Insulator
2. speed up conductivity
What is saltatory conduction
the phenomenon by which the conduction is sped up because of the meylin covering of nerve fibers
_________ cells lie outside of the myelin sheath
Neurolemma / Schwann’s sheath
Another name for neurolemma
schwann’s sheath
Another name for Schwann’s sheath
Neurolemma
________ wraps around the internodal segment of myelin
Schwann’s cells
3 roles of the Schwann cells
- Protective covering
- role in regeneration of nerves
- forms myelin sheath
An axon arises from the cell body at the ______
hillock
The terminal branch of an axon is called____
telodendria
The axoplasm in axones are granulated/ or non gradulated
lack granules
In axons the Telodendria terminates in bulbous endings called ______
terminal boutons
_____ are the fibers in gray matter
Naked fibers
______ are fibers of the white matter in the CNS
myelinated without neurolemma
_______ are fibers in the spinal nerves
Myelinated with neurolemma
______ are fibers of the ANS
nonmyelinated with neurolemma
______ cells are cells of support to the nerve cells adn their processes
Neuroglia cells
Neuroglia proper are found only in the ___
CNS
Modified Neuroglia are found in the ____
CNS and PNS
Name the three subtypes of Neuroglia Proper
- Astrocytes
- Oligodendroglia
- Microglia
_____ are neuroglia proper cells that have multiple processes ending by perivascular feet around blood vessels
astrocytes
Name the two types of Neuroglia proper ASTROCYTES
- Where are each found?
- Protoplasmic - grey matter of CNS
2. Fibrous - White matter of CNS
Neuroglia proper MICROGLIA cells are small ______ cells with processes at the poles
spindle cells
- They are phagocytic cells
_______ cells are Neuroglia phagocytic cells
Mircolgia
tiny but mighty phagocytic cells
Two types of neuroglia proper cells that are derived from ____derm tissue
- Astrocytes
2. Oligodendroglia
_________ neuroglia proper cell is derived from mesoderm
Microglia
__________ neuroglia proper cell forms myelin sheath around nerves
Oligodendroglia
they are the god of myelin
Where are modified neuroglia found ?
CNS & PNS
Name the three types of modified Neuroglia
- Neurolemma cells
- Satellite cells
- Ependymal cells
Neurolemma cells are present only in the _____
PNS
________ cells are schwann cells that surround cell bodies of neurons inside gg
Satellite cells
_____ cells are columnar cells (modified neuroglia) with some cilia, lining the brain and spinal cord
Ependymal cells
Ependymal cells are modified neuroglia cells with cilia that line the _____ & _____
brain & canal of spinal cord
4 fxn of Neuroglia
- support Nerve cells
- Control flow of maerial to nervous tissue. Feet are around blood vessels making the Blood brain barrier( BBB)
- formation of myelin by oligodendroglia
- Defense of CNS via phagocytic microglia
_______ is a neuroglia cell that forms myelin around PERIPHERAL nerves
Neurolemma cells
_____ forms myelin in the CNS
Oligodendroglia
______ is a type of ganglion cell that is found in spinal ganglia
Pseudounipolar nerve cells
What type of neuroglia cells contribute to the blood-brain barrier
Astrocytes
Their Perivascular feet
_____ is the C.T that separates bundles of nerve fibers inside the nerve
perineurium
What is the type of nerve fiber found in the gray matter of the CNS
Naked fibers
SYnaptic vescicles release _____ under the influence of the action potential
neurotransmitters
What do microglia contain ?
phagocytic cells