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