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SpinalCord & Autonom
Anatomy lecture 3
| Question | Answer |
|---|---|
| CNS consists of? | Brain & spinal cord |
| What is the foramen magnum? | Hole at the bottom of the skull |
| Spinal cord ends where? | At L-2 |
| What is conus medullaris? | It is where spinal cord ends |
| What is the area below conus medullaris and what does it consist of? | IT is called cauda equina and contains nerve fibers hanging down like a horses tail |
| How many spinal nerves are there? | 31 |
| What does it mean by "typical nerve" | It means that they contain both sensory and motor functions. They control both Somatic & visceral motor and sensory |
| What does it mean by "atypical nerves" | They have only one funciton either motor or sensory |
| Which nerves are atpyical and their functions? | C-1 is motor only and Coccy-1 is sensory only. C-1 has both somatic and visceral functions |
| What is somatic | Voluntary actions i.e skeletal muscle movement |
| What is visceral | Involuntary actions i.e smooth muscles |
| What does C-1 nerve does not have which other nerves in the spinal cord have? | C-1 does not have Dorsal root ganglion |
| What is a Dorsal Root Ganglion? | Collection of nerve cell bodies outside of nervrous system |
| What is pseudounipolar neuron? | A neuron with 2 branched axons. One axon runs into the periphery and other to the spinal cord |
| Another term for Posterior | Dorsal |
| Another term for anterior | ventral |
| Butterfly like structure in the spinal cord is called? | Gray matter |
| Gray matter contains what? | Motor neurons, interneurons, blood vessels and supporting cells |
| Interneurons are located where? | Between incoming senosory and outgoing motor neuron |
| Where are the incoming sensory and outgoing motor neuronslocated ? | Sensory are in the Dorsal horn and the motor neuron are in the ventral horn |
| What part of the spinal cord are the dorsal and ventral horn found. | Dorsal and ventral honrs are found in all parts of the spinal cord. But T-1, L-2 Sacral 2-4 contains a lateral horn. |
| Surrounding the gray matter is an area called? | White Matter |
| White Matter contains what? | It contains decending motor neurons and ascending sensory neurons |
| Ventral horn contains which type of neurons? | Ventral horn has motor interneurons |
| Dorsal horn contains which type of neurons | Senosory interneurons |
| What is the function of interneurons? | They connect the afferent(incoming sensory) with efferent(outgoing motor) |
| Dorsal root ganglion is made up of what? | It is made up of Posterior sensory roots and anterior motor roots |
| Between Lateral Horn in T-1 L-2 has what connected to it | Lateral Horn is composed to Preganglionic Sympathetic Neurons(Visceral motor neuron) |
| Lateral Horn in Sacral 2-4 has what connected to it? | It has Preganglionic parasympathetic neurons |
| What are the 3 vertebral levels | The spinal cord ends at L-2 but the Dura mater continues and goes all the way down to S-2 and this is called dural sac and from the bottom of the dural sac there is a continuation of the sac called filum ternminale externum which connects at the C-2 |
| GSE,GSA,GVE,GVA |
Created by:
moju85
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