Term
| What are the support cells found throughout the nervous system? |
|
Definition
| glial cel (oligodendrocyte) |
|
|
Term
| What are the two major regions of the spinal cord? |
|
Definition
1) Gray matter which has neuronal cell bodies
2) White matter, which has axons and long dendrites |
|
|
Term
| what contains bundles of myelinated axons? |
|
Definition
|
|
Term
| The cytoplasm in the cell body, or perikaryon, is rich in clusters of rough endoplasmic reticulum, which in neurons is termed... |
|
Definition
| Nissl substance or Nissl bodies (the blue/purple flacky material) |
|
|
Term
| Do dendrites or axons contain Nissl substance? |
|
Definition
dendrites do;
axons do not |
|
|
Term
| The "tapered" beginning to an axon is? |
|
Definition
|
|
Term
| what is stained with silver stain? (brownish color) |
|
Definition
| proteins; so both axons and dendrites will be stained and visible |
|
|
Term
| The white matter of the spinal cord contains? |
|
Definition
| myelinated axons (and some dendrites) that are sending information up and down the central nervous system. |
|
|
Term
| How are the axons oriented in a cross section of a spinal cord? |
|
Definition
| the fibers are oriented cranial-caudal, they are cut in cross-section |
|
|
Term
| What surrounds the myelinated axons in the white matter? |
|
Definition
1) blood vessels
2) CT-such as collagen fiber stain positively for silver stain just not as positive as in the gray matter |
|
|
Term
| The special stain for myelin is what color? |
|
Definition
|
|
Term
|
Definition
| axons (and sometimes long dendrites) together with supporting cells, embedded within connective tissue and surrounded by a highly cellular connective tissue layer |
|
|
Term
|
Definition
|
|
Term
| In the peripheral nervous system, individual axons (and large dendrites) are surrounded by... |
|
Definition
|
|
Term
| regions of bare axon not surrounded by myelin are called |
|
Definition
|
|
Term
| The Schwann cell initially surrounds several axons with portions of its cytoplasm and plasma membrane. This arrangement is termed... |
|
Definition
|
|
Term
|
Definition
|
|
Term
| . In larger axons, the Schwann cell selects a single axon to support, and wraps its cytoplasm and plasma membrane around the axon numerous times. After squeezing out the cytoplasm, the remaining layers of Schwann cell membrane are... |
|
Definition
|
|
Term
| A single axon is myelinated by a single schwann cell? True/False |
|
Definition
|
|
Term
| In H&E, the axons stain... |
|
Definition
| eosinophillic, maybe a touch purple |
|
|
Term
| Smaller peripheral nerves (outlined) can be found throughout the body. The details of the axon and myelin sheath are lost in nerves this size. However, several distinguishing features allow us to distinguish this from the surrounding connective tissue: |
|
Definition
1) pale eosinophilia - again, due to the washed out myelin
2) wavy appearance – nerves are elastic, and recoil on tissue preparation
3) a distinct perineurium (arrows) – we’ll discuss this layer later in the module
4) numerous nuclei – most of these are Schwann cells |
|
|
Term
| a loose connective tissue between axons |
|
Definition
|
|
Term
| a cellular layer that bundles many axons into structures called fasicles |
|
Definition
|
|
Term
| a dense connective tissue, often containing adipose, that bundles fasicles together |
|
Definition
|
|
Term
| What consists of clusters of cell bodies , together with supporting cells, contained within a connective tissue capsule? |
|
Definition
|
|
Term
| The nuclei surrounding the neurons belong to supporting cells called... |
|
Definition
|
|
Term
| What are located away from the central nervous system or within the wall of the organ? |
|
Definition
|
|
