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Dezare Casas Week 7
week 13 assignment
| Questioncentr | Answer |
|---|---|
| central nervous system (CNS) | the structural and functional center of the entire nervous system. Consisting of the brain and spinal cord, |
| peripheral nervous system (PNS) | consists of the nerve tissues that lie in the periphery, or “outer regions,” of the nervous system |
| afferent division | m consists of all of the incoming sensory or afferent pathways. |
| efferent division | consists of all the outgoing motor or efferent pathways. |
| somatic nervous system (SNS) | regulates the somatic effectors, which are the skeletal muscles. |
| autonomic nervous system (ANS) | carry information to the autonomic, or visceral, effectors, which are mainly the smooth muscles, cardiac muscle, glands, adipose tissue, and other “involuntary” tissue. |
| enteric nervous system (ENS) | is a so-called “second brain” in the wall of the gut. |
| Neurons | excitable cells that conduct the impulses that make possible all nervous system functions. |
| Glia | do not usually conduct information themselves but support the function of neurons in various ways. |
| astrocytes | Found only in the CNS, they are the largest and most numerous type of glia |
| microglia | are very small cells found in the CNS |
| Ependymal cells | are glia that resemble epithe-lial cells, forming thin sheets that line fluid-filled cavities in the brain and spinal cord. |
| Oligodendrocytes | are smaller than astrocytes and have fewer processes. |
| Schwann cells | are found only in the PNS, are called nodes of Ranvier or simply myelin sheath gaps. also called neurolemmocytes |
| neurilemma | essential to normal nerve growth and the regen-eration of injured nerve fibers |