Anatomy of a Neuron: Cell Body and Dendrites
towards
Dendrites convey incoming messages __________ the cell bodies.
surface area, signals
Dendrites: provide an enormous ___________ _______ for receiving __________ from other neurons
CNS, bone
Most neuron cell bodies are located in the _______, where they are protected by _______
Processes
armlike extensions from the cell body
tracts
What are bundles of neuron processes in the CNS called?
nerves
What are bundles of neuron processes in the PNS called?
maintaining shape and cell integrity
What are microtubules and neurofibrils important for?
dendrites and axons, the structure and the function of their plasma membrane
What are the two types of neuron processes? How do they differ?
points of close contact, synapses, with other neurons
What do dendritic spines represent?
nissl bodies
What is another name for the Rough ER in the neuron?
ganglia
What is the name for cluster of cell bodies in the PNS?
nuclei
What is the name for clusters of cell bodies in the CNS?
the main receptive or input region of a neuron
What is the role of dendrites?
acts as a receptive region that receives information from other neurons
What is the role of the plasma membrane in a neuron?
Rough ER
What structure of a neuron is most active and best developed in the body?
graded potentials
What type of signals are formed by dendrites?
Free ribosomes, Rough ER, Golgi Apparatus, Mitochondria, Microtubules and Neurofibrils, Plasma membrane
What usual organelles does a neuron contain to synthesize proteins and other chemicals? (7)
Cell body
consists of a spherical nucleus with a conspicuous nucleolus surrounded by cytoplasm, major biosynthetic center of a neuron
Dendrites
short, tapering, diffusely branching extensions
Dendritic Spines
thorny appendages with bulbous or spiky ends
Golgi apparatus
well developed, very efficient in making neurotransmitters that are constantly being secreted
