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GRCC B121 #4 spinal
GRCC BI 121 spinal cord components
| Question | Answer |
|---|---|
| Cervical enlargement | component of spinal cord and is the origin of the arm nerves |
| Lumbar enlargement | component of spinal cord and is the origin of the leg nerves |
| conus medullaris | End of the spinal cord at L1 |
| Filum Terminale | Pia mater that attaches cord to superior coccyx |
| Cauda Equina | Nerves radiating from inferior lumbar enlargement |
| Central Canal | Continuous with brain ventricles |
| Gray matter of the spinal cord | Internuerons and motor neuron cell bodies |
| White matter of the spinal cord | axons |
| Spinal Cord function | Spinal reflex arc transmission |
| Conduit for impulses to (afferent) and from (efferent) brain | Spinal Cord function |
| Reflex Arc | Spinal cord fx, pathways for impulses (reflexes) that do not go through brain. |
| Heart rate, blood pressure, sneezing, knee jerk | e.g. of Reflex Arc |
| reflexes/impulses that go through the spinal cord | Reflex Arc |
| Reflex Arc Components | Receptor, sensory neurons, interneurons, motor neurons, effectors |
| Receptor | An RA component that recieves stimulus |
| e.g. of receptor, an RA component | Meissner's |
| Sensory Neurons | An RA component where the PNS neuron that delivers stimulus to interneuron in CNS. |
| Interneurons (association) | An RA component where CNS neurons that form reflex centers that relay stimuli. |
| This is not always present | Interneuron (RA component) |
| Knee jerk | e.g. interneurons (association) |
| Motor Neurons | An RA component that passes stimulus to effectors |
| Nerve tracts | Component of spinal cord |
| Composed of axons with a common origin & terminus & cross over in cord or brain stem therefore right brain receives from left body. | nerve tracts |
| Right brain receives from left body via? | Tracts that are composed of axons with a common origin and terminus & cross over in cord or brain stem. |
| How do nerve tracts work? | Through ascending and descending impulses. |
| Ascending nerve tract | Carry sensory (afferent) impulse up to brain. |
| Each have 6 tracts | Ascending & descending nerve tracts |
| Descending tracts | Carry motor (efferent) impulse down to neurons. (Away from brain) |
| Damage to a tract anywhere along its length will affect what? | Its function. (e.g. coricospinal tract and skeletal muscles) |
| What happens if there is damage to the descending tract? | Loss of motor function inferior to damaged area. |
| What happens if there is damage to the ascending tract? | Loss of sensation inferior to damaged area. |
| Afferent | Ascending tracts |
| Efferent | Descending tracts |
| Think Christopher Reeve damage to C1 & C2 | Damaged this tracts to c1 & c2....everything below didn't work. |
| Experimental repair of spinal tracts | protein blockers, PNS neuron transplant, Neural stem cell |
| Protein blockers | An experimental repair of spinal tracts:Blocks the CNS protein that prevents axon regeneration. |
| PNS neuron transplant | An experimental repair of spinal tracts: PNS neuron and growth factor |
| Neural stem cell | An experimental repair of spinal tracts: Brain stem cells induces to form patches. |
Created by:
Wends1984
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