| A | B |
|---|
| Neurons | Cell body, dendrites, axon |
| Cell Body | Contains a nucleus surrounded by a cytoplasm that includes typical organelles such as lysosomes, mitochondria, and a Golgi complex |
| Dendrites | recieving or input portion of a neuron. multiple dendrites, and one axon; dendrites means little trees |
| axon | conducts nerve impulses toward another neuron, a muscle fiber or a gland cell; a long thing cylindrical projection that often joins the cell body at a cone shaped elevation called the axon hillock. |
| Axon Hillock | mean small hill |
| Axon collaterals | side branches |
| Axon terminals | axons end by dividing into terminals. little branches |
| Synapses | sites where two neurons or a neujron and an effector cell can communicate. |
| Synaptic End Bulbs | tips of most axon terminals swell into end bulbs |
| Synaptic Vesicles | Synaptic End Bulbs contain these vesicles |
| neurotransmitters | molecules released from synaptic vesicles are means of communication from one neuron to another |
| Neuroglia | Glue; support and protect neurons; generally are smaller than neurons and are 5 to 50 times more numerous |
| myelinated | Axons with a covering. |
| unmyelinated | axons without myelin. |
| Schwann cell | wraps itself around a small segment of an axons length many times. it forms multiple layers around the PNS axon. |
| nuerolemma | areas between schwann cells that are open gaps. |
| oligodendrocytes | mylinate CNS axons in somewhat the same manner that schwann cells mylinate PNS axons |
| White matter | Aggregations of myelinated processes from many neurons |
| Gray Matter | Contains neuronal cell bodies, dendrites, unmyelinated axons, axon terminals, and neuroglia. |
| tract | a bundle of axons located in the CNS that extends for some distance up or down the spinal cord, or connects parts of the brain with each other and with the spinal cord |
