Flashcards in Nervous Tissue Deck (84):
What is the nervous system?
The body's primary communication and control system
What two types of nervous tissue is the nervous system composed of?
Neurons and Glial cells
What are the two names of the structural division of the nervous system?
CNS and PNS
What two structures does the CNS include?
brain and spinal cord
What three structures does the PNS include?
cranial nerves, spinal nerves and ganglia
What is a bunch of soma in the CNS called?
What is a bunch of axons in the CNS called?
What is a bunch of soma in the PNS called?
What are a bunch of axons in the PNS called?
What are the two ways to classify the nervous system functionally?
Sensory nervous system and motor nervous system
The sensory nervous system is ____ information.
Which way does information flow in the sensory nervous system?
PNS -----> CNS
What are the two subcategories of the sensory nervous system?
Visceral sensory and somatic sensory
Is somatic sensory conscious or unconscious stimuli?
What are six examples of somatic sensory?
touch, pain, pressure, smell, sight, and sound
Is visceral sensory information unconscious or conscious?
What is an example of visceral sensory information?
information from organs (blood vessel stretch)
The motor nervous system is _____ information.
Which way does information flow in the motor nervous system?
CNS ----> PNS
Which two subcategories are under the motor nervous system?
Autonomic motor and somatic motor
Is somatic motor voluntary or involuntary?
What does the somatic motor system innervate?
Is the autonomic motor system voluntary or involuntary?
What does the autonomic motor system innervate?
smooth and cardiac muscles, glands
What two subcategories are under the autonomic motor system?
Sympathetic and parasympathetic
What is the catch phrase for the sympathetic nervous system?
Fight or flight
What does the sympathetic nervous system prepare the body for?
energy consuming activities
What is the catch phrase for the parasympathetic nervous system?
rest and digest
What does the parasympathetic nervous system prepare the body for?
gaining and conserving energy
What is the description for a neuron?
electrically excitable and conductive
What are the three characteristics of neurons?
high metabolic rate, extreme longevity and non-mitotic
What three structures are part of a neuron?
soma, dendrites, axons
What does the soma do?
receive, integrate and send information
What three organelles are found in the soma?
mitochondria, RER and ribosomes
What are many RER and ribosomes in one area called?
What color are Nissl Bodies?
What do dendrites do?
Receive information and send it to the soma
What do axons do?
Sends information to effector
What is the axon hillock?
site of axon connection to soma
What are axon collaterals?
What is telodendria?
Fine terminal extensions
What are synaptic knobs?
expanded tips of telodendria
How are neurons classified structurally?
it is based on the number of processes from the soma
What does a unipolar neuron look like?
single short process that branches like a T
What does a bipolar neuron look like?
2 processes, one for dendrites, other for axon
What does a multipolar neuron look like?
many dendrites and a single axon
Of the three neurons, which is the most common?
How are neurons classified functionally?
it is based on the direction of the impulse
What is another name for sensory neurons?
What is another name for motor neurons?
Which direction do sensory neuron impulses go?
From sensory receptors to CNS
Structurally, which type of neuron are sensory neurons? of the two, which one is it mostly.
unipolar and bipolar. mostly unipolar
Where are the cell bodies found for sensory neurons?
outside of the CNS
Which direction to motor neuron impulses go?
from the CNS to muscles or glands
Structurally, what type of neuron is a motor neuron? Where is the soma located?
multipolar and inside CNS
What do interneurons transmit?
impulses between sensory and motor neurons
About what percentage of neurons is made up by interneurons?
Structurally what kind of neuron is an interneuron and where is the cell body located?
multipolar and inside the CNS
What is the function of glial cells?
protect and nourish neurons
What are the four characteristics of glial cells?
Not excitable, mitotic, smaller and more abundant
What do astrocytes look like? Are there a lot of them?
star shaped; they are most abundant
What are the four functions of astrocytes?
forms blood brain barrier, forms structural framework, replaces damaged neurons, and assisting neuronal development
What are ependymal cells?
ciliated cuboidal cells lining ventricles ad central canal of spinal cord
What do ependymal cells form?
What is the function of ependymal cells?
produce and circulate CSF
What does CSF do?
nourish nervous tissue
What are the three characteristics of microglial cells?
smallest cells, least abundant and phagocytic
What is the function of microglial cells?
respond to infections, remove waste and debris
Are oligodendrocytes large or small?
What is the function of oligodendrocytes?
myelinated multiple axons in the CNS
What is myelin?
What color is myelin? Why is it that color?
White because it is lipid filled.
What are satellite cells?
flattened cells surrounding soma in ganglia
What is the function of satellite cells?
keeps soma separate and regulates nutrients
What are neurolemmocytes?
What is the function of neurolemmocytes?
myelinated single axon in PNS
What are nerves?
Bundle of parallel axons in PNS
What kind of connective tissue surround the endometrium?
What does the endometrium surround?
Schwann cells and axon
What kind of CT surrounds the perineum?
Dense irregular CT
What does the perineum surround?
Fascicles (group of axons)
What kind of CT surrounds the epinerium?
Dense irregular CT
What does the epinerium surround?
A nerve (bundle of fascicles)