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Histology - NT
Nervous Tissue
| Topic | Answer |
|---|---|
| Components of CNS | Brain, spinal cord |
| Grey matter vs. white matter | Grey matter: neuronal cell body, axon hillock, dendrites --- White matter: myelinated and unmyelinated axons |
| Grey and white matter distribution in CNS | Brain: grey matter peripherally; white matter central --- Spinal cord: grey matter centrally; white matter peripherally |
| Cells lining the canal of spinal cord | Ependymal cells |
| Types of glial cells in CNS | Oligodendrocytes (myelinating cells), astrocytes (nutritional & structural cells), microglia (modified macrophage) |
| Types of vessels not found in CNS | Lymphatic vessels |
| Components of PNS | All nerve fibers outside of CNS; autonomic ganglia, sensory ganglia |
| Types of glial cells in PNS | Schwann cells (neurolemmocytes; myelinating cells), satellite cells (cells surrounding sensory ganglia) |
| Organization of fibers in PNS | Endoneurium surrounds individual nerve fibers (axons); Perineurium surrounds fascicles (group of nerve fibers); Epineurium surrounds each nerve (collection of fascicles) |
| Meningeal organization in the spinal cord | Pia mater is continuous with outer surface of spinal cord; Arachnoid mater is filamentous layer above pia mater; Dura mater is thick connective tissue layer found superficially |
| Location of CSF fluid in spinal cord | Subarachnoid space |
| Sources of sensory ganglia | Dorsal root ganglia; Craniospinal ganglia |
| Sources of autonomic ganglia | Sympathetic ganglia (T1-L2); Parasympathetic ganglia |
| Cells surrounding sensory ganglia | Satellite cells |
| Types of neurons in sensory ganglia (i.e., unipolar, bipolar, pseudounipolar?) | Pseudounipolar; incoming sensory impulses bypass the soma & travel directly from dendrites to axon |
| Differentiating feature between sensory and autonomic ganglia | Sensory ganglia tend to be densely packed with nerve fibers; autonomic ganglia tend to be smaller, less densely packed with nerve fibers |
| Neuropil | Dendrites and axons that comprise the bulk of grey matter; appears pale & grainy |
| Nissl substance | Basophilic staining cytoplasmic areas of neuron that contains large quantity of ER & ribosomes |
| Number of layers in cerebrum | Six layers |
| Layers in cerebellar grey matter | Molecular layer (surrounded by pia mater; contains neuropil); Purkijie layer (pyramidal shaped cells with distinctive nucleus and nucleolus); granular layer (adjacent to white matter; densely packed with interneurons) |
| Cells responsible for producing CSF; location of cells | Ependymal cells; choroid plexus |
| Location of CSF in meninges | Subarachnoid space |
| Number of axons Schawnn cell can myelinate | One |
| Number of axons oligodendrocyte can myelinate | Many |
| Cells responsible for producing blood-brain barrier | Astrocytes using foot processes |
| Location of autonomic preganglionic cell bodies (PNS or CNS?) | CNS |
Created by:
ruslan
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