Nervous System (Part 3)
What are the basic functional units of the nervous system?
What is the most common neuron in the CNS?
The multicolor neuron
What are the three main components of a neuron?
Cell body (soma)
What is another name for cytoplasm of a neuron?
RER and ribosomes produce what in a neuron cell body?
Dense areas of RER and ribosomes that make neural tissue appear gray are called what?
Inside the cytoskeleton of a neuron, what is put in place of microfilaments and microtubules?
neurofilaments and neurotubules
Bundles of neurofilaments that provide support for Dendrites and axon are called what?
What represents 80-90% of a neurons surface area?
Dendrites are also called what?
While Dendrites have many fine processes, what is their main function?
To receive information from other neurons
This part of the cell generates and conducts nerve impulses?
What is the proper name for the electrical signal carried by the axon?
What are the seven structures of the Axon?
What is the cytoplasm of the axon, containing neurofibrils, neurotubles, enzymes and organelles?
This is the specialized cell membrane that coves the axoplasm.
This is the thick section of the cell body that attaches to the initial segment.
This is where the axon begins, attaching to the axon hillock.
These are the side branches of an axon and enable a single cell to communicate with several other cells.
Theses are the fine extensions of distal axon or ends of the collaterals.
Theses are the tips of the telodendria and apart of the synapse.
These store neurotransmitters in tiny vesicles.
What is the area where an neuron communicates with another cell?
There is a small gap that separates the presynaptic membrane from the postsynaptic membrane. What is it called?
What is the expanded area of a presynaptic neuron called?
This area contains the ER, mitochondria and synaptic vesicals of neurotransmitters.
The synaptic terminal
What are neurotransmitters?
Chemical messages released at presynaptic membrane triggered by electrical events and into the synaptic cleft.
After neurotransmitters are in the synaptic cleft, what happens to them?
They bind to the receptors of the postsynaptic membrane and are broken down by enzymes
Neurons fall under what to classifications?
Structural and functional
What are the 4 structural classifications of neurons?
What are the three functional classifications of neurons?
These neurons are found in the brain and sense organs.
These neurons are found in special sensory organs (sight, smell, hearing).
These neurons are found in sensory neurons of the PNS carrying info
These neurons are common in the CNS and include all skeletal muscle motor neurons.
These neurons are the afferet neurons of the PNS.
These neurons are also called association neurons.
These neurons are the Efferent neurons of the PNS
These neurons are Unipolar, have cell bodies grouped in sensory ganglia, and afferent fibers extend from sensory receptors to CNS.
What are the functions of a sensory neuron?
To monitor internal environment, and monitor effects of external enviornment
What are the three types of sensory receptors?
This type of sensory receptor monitors internal systems (digestive, respiratory) and internal senses (pain, taste, deep pressure).
This type of sensory receptor monitors external senses (touch, temperature, pressure) and distance senses (sight, smell, hearing).
This type of sensory receptor monitors position and movement (skeletal muscles and joints).
What are the 4 kinds of cutaneous receptors?
Merkel Discs - pain and temp
Meissners corpuscles - light touch
Ruffifi's corpuscles - deep continuous pressure and stretch
Pacinian corpuscles - deep pressure
Where are most interneurons located?
In the brain, spinal cord, and Autonomic ganglia
What is responsible for the distribution of sensory information, coordination of motor activity, and involved in higher functions?
This portion of the CNS is composed of myelinated nerve fibers