Neuron Structure. Neurons Three classified types of neurons: Sensory Neurons Associative (inter neurons) Motor Neurons.

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Presentation transcript:

Neuron Structure

Neurons Three classified types of neurons: Sensory Neurons Associative (inter neurons) Motor Neurons

Sensory Neurons Transfer message from receptors PNS to CNS. (3 types of receptors)

Sensory Neurons Exteroceptors: External, or on surface. (eyes, ears, skin ~ sense environment)

Sensory Neurons Propioceptors: Involved in balance and tension (muscles)

Sensory Neurons Interoceptors: Internal (digestion, hunger, excretion, heart, breathing)

Inter-neurons ONLY IN CNS!!!! Link sensory to motor

Motor neurons Message from CNS to effectors (muscles, glands)

Let us put it together! Roman Candle time.

NEURON STRUCTURE

COLOR CODE TIME PLEASE COLOR CODE THE NEURON ON PAGE 4. Color d, g, h, I, j, k, l and cell body

CELL BODY AKA Soma Contains nucleus, neuroplasm, nissl bodies.

Nissl Bodies Clusters of ribosomes (energy/protein makers)

Dendrites Receive signals, impulse carried towards cell body. Afferent process. (Carry toward)

Axon Carries outgoing signals (away from cell body = Efferent process Can branch to touch many fibers.

Myelin Insulated lipid that improves impulse speed. White in appearance

Myelin A. White matter: White appearance from myelin CNS

Myelin B. Gray matter: No myelin, outer part of brain (cortex) and some CNS

Neurilemma Thin membrane that surrounds axon in PNS. If nerve has neurilemma it CAN regenerate!

Node of Ranvier Gaps between glial cells where myelin is not complete. Saltatory conduction= jump from node to node.

Schwann cell Neuroglia cells which add myelin to axons of the PNS