The document provides an overview of the nervous system, including key components and cellular organization. It discusses the central nervous system (CNS) which includes the brain and spinal cord for integration and processing. The peripheral nervous system (PNS) connects the CNS to sensory receptors and effector cells. Neurons and neuroglia are the main cell types, with neurons transmitting signals and neuroglia providing support. Communication occurs at synapses, with chemical synapses being most common.

3. Made up of neurons and neuroglia

4. Similar to fig 12.3

7. Cell body = Soma

9. The “signal,” or Action Potential is carried along the neurilemma Faster if axon is myelinated

14. Color enhanced TEM x 186,480

20. Astrocytes : largest & most numerous BBB, control of environment structural framework & repairs regulation of ions,and nutrients, gases

26. Schwann Cells in the PNS Myelinated Nonmyelinated Fig 12.15

29. The circuit fig 12.11