neurons

3 functional classes of neurons

-sensory (afferent)

-motor (efferent)

-interneurons

sensory (afferent)

-incoming ➡

-dorsal posterior

S = sensory & stimuli

motor (efferent)

-outgoing ⬅

-ventral anterior

interneurons 

-only in central nervous system -> brain & spinal cord

-90% of neurons in body are interneurons 

interneurons jobs

-integrate sensory information & coordination motor action 

-interneurons integrating -> taking info from sensory neurons through posterior spinal cord & then integrating

structure of a neuron

-NO CENTRIOLES -> CANNOT UNDERGO MITOSIS

-dendrite

-axon & axon hillock

dendrite

-receiving signals -> INCOMING  information ➡

axon

-specialized for rapid conduction of nerve signals -> OUTGOING information ⬅

axon hillock

-action potential & trigger zone 😤

mylin

-insulation around axon & speeds up action potential

polar neurons

-multipolar

-bipolar

-unipolar

multipolar neuron

-most common, M = MOST COMMON 😄

bipolar neuron

-single dendrite & single axon found in retina 👁

unipolar neuron

-skin