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T2 PNS
PNS Histo review
| Question | Answer |
|---|---|
| Structural classifications of types of neurons | Multipolar and Pseudounipolar: Bipolar and Unipolar |
| The most important for PNS are _______ and ________ | Multipolar and pseudounipolar |
| The most common neuronal cell type is ______ | multipolar |
| All neurons exhibit a _______ and an ________ | Cell body and axon |
| No neuron has more than how many axons? | one |
| which neurons have no dendrites? | Pseudounipolar cells |
| The majority of neurons (multipolar) exhibit a cell body, axon and _____________________? | many highly branched dendrites |
| Multipolar neurons may be either ________ or ________ | motor or sensory |
| Pseudounipolar neurons are only ________ neurons. | Sensory (primary afferent, GSA or GVA) |
| CNS neurons are COMPLETELY contained in the ______. | CNS |
| If any part (typically axon) of the neuron is in the PNS, then the neuron is considered __________. | PNS |
| Pseudounipolar neurons are classified as only ______ nuerons, and the only functional examplse are _____________. | PNS, primary afferent neurons |
| PNS examples of Afferent neurons are? | GSA, GVA, SVA, SSA |
| Afferent neurons are primary ______ neurons, ALL of the ____ and ____ are pseudounipolar neurons. | Sensory. GSA and GVA |
| Somatic neurons (_____, ______) are those that innervate what? | (GSE, GSA), innervate structures |
| All pre-ganglionic GVE neurons have ________ axons. | myelinated |
| All postganglionic GVE neurons have _______ axons. | unmyelinated |
| All neurons whose cell bodies are in the CNS are derived from the ______________. | mantle zone of the neural tube |
| All neurons whose cell bodies are in the PNS are derived from the _________. | neural crest. |
| Multipolar neuron type, CNS | Pyramidal cells (cerebrum), Purkinje cells (cerebellum), interneurons, ascending and descending tract cells |
| Multipolar neuron type, PNS | GSE (aka Final common pathway neurons, alpha motor neurons, LMNs); pre and postganglionic GVE sympathetic and parasympathetic neurons |
| Multipolar neuron type, motor | Pyramidal and Purkinje cells, GSE and GVE cells |
| Multipolar neuron type, sensory | 2nd, 3rd, 4th order ascending tract cells |
| Pseudounipolar neuron, CNS? PNS? Motor? Sensory? | CNS/Motor- none, Sensory- ALL, PNS- All GSA and GVA neurons of both spinal and cranial nerves |
| Bipolar neuron, CNS? PNS? Motor? Sensory? | CNS/Motor- none, Sensory- ALL, PNS- Olfactory, retinal and spiral ganglion of the cochlea |
| Unipolar CNS? PNS? Motor? Sensory? | CNS/Motor- none, Sensory- ALL, PNS- Rods and Cones of Retina |
| cell bodies of various shapes and sizes, note Pyramidal cells and Purkinje cells | Multipolar |
| cell bodies of basically large and small. Large- myelinated axons, touch and proprioceptions. Small- unmyleniated axons, pain and temp | Pseudounipolar |
| Axons. One, branches typically at the terminal end. | multipolar |
| Axons. One, branches near the cell body into peripheral process and central process | Pseudounipolar |
| Dendrites. MANY, frequent branch points, occasionally exhibit spines to increase surface area | Multipolar |
| Dendrites. None. | Pseudounipolar |
| CNS examples. Pyramidal neurons, extrapyramidal neurons, interneurons, ascending sensory tract neruons (secondary, tertiary, etc..) | Multipolar |
| CNS examples. NONE. | Pseudounipolar |
| PNS examples. GSE, pre- and post- GVE | Multipolar |
| PNS examples. GSA, GVA, primary afferent neurons | Pseudounipolar |
| Motor/Efferent examples. Pyramidal, Extrapyramidal, GSE, GVE pre and post ganglionic | Multipolar |
| Motor/Efferent examples. NONE. | Pseudounipolar |
| Sensory/Afferent examples. 2nd, 3rd, 4th order afferent tract neurons. | Multipolar |
| Sensory/Afferent examples. Primary afferent neurons: GSA, GVA | Pseudounipolar |
| Satellite cells, CNS/PNS? Specific position? Function? | PNS..... Dorsal root and spinal ganglion..... Surround cell bodies, nutritive |
| Scwann Cells, CNS/PNS? Specific position? Function? | PNS..... Peripheral ggl and nerves (spinal and cranial).... Myelinate a piece of one axon; associate with all PNS axons; repair regeneration |
| Oligodendrocyte, CNS/PNS? Specific position? Function? | CNS.... White and Gray matter..... Myelinate pieces of many axons. Not associated with unmyelinated axons |
| Astrocytes, CNS/PNS? Specific position? Function? | CNS.....XXX.....Physical Blood Brain Barrier; Nutrition; Glial scarring: Neurofibrillar Tangles |
| Protoplasmic Astrocyte, CNS/PNS? Specific position? Function? | XXX.... Gray Matter, surrounding cell bodies.....Physical Blood Brain Barrier; Nutrition; Glial scarring: Neurofibrillar Tangles |
| Plasmofibrillar Astrocyte, CNS/PNS? Specific position? Function? | XXX..... Border of gray and white matter.....Physical Blood Brain Barrier; Nutrition; Glial scarring: Neurofibrillar Tangles |
| Fibrous Astrocyte, CNS/PNS? Specific position? Function? | XXX..... White matter......Physical Blood Brain Barrier; Nutrition; Glial scarring: Neurofibrillar Tangles |
| Velate Astrocyte, CNS/PNS? Specific position? Function? | XXX.....Cerebellum......Physical Blood Brain Barrier; Nutrition; Glial scarring: Neurofibrillar Tangles |
| Microglial Cells, CNS/PNS? Specific position? Function? | CNS..... Surrounding vasculature.... These are the ***only cells in the CNS derived from the mesoderm***: macrophages |
| Ependymal cells, CNS/PNS? Specific position? Function? | CNS.... surrounding, lining the ventricles and central canal.... Nutritive, primary defense; specific cells making up the choroid plexus make CSF |
| There are two names oligodendrocytes; Gray matter- ______, White matter- ________ | Gray- perinuclear, white- fibrillar |
| Two specific parts of the BBB | Membrana limitans glia perivascularis (surrounding vasculature), and membrana limitans glia superficialis (deep to the pia mater) |
| Origin and site of Schwann cells | Neural crest, PNS |
| Origin and site of Oligodendrocytes | Ependymal layer and neural crest, CNS |
| Function of Schwann cells | Associated with all types of PNS axons, myelinates a piece of one axon |
| Function of Oligodendrocytes | Myelinates pieces of many axons |
| Schwann cells may be found in | Ganglia and nerves |
| Oligodendrocytes may be found in | Gray and White matter |
Created by:
Brad88