Term
| How many neurons are in a typical somatosensory pathway? Where are they and what are they called? |
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Definition
3
Primary (sensor cell body), secondary (CNS), tertiary (thalamus) |
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Term
| How many neurons are in a typical motor pathway? What are they called? |
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Definition
2
Corticospinal, alpha-motor neuron |
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Term
| Define the dorsal column/ medial lemniscal pathway |
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Definition
| The long tract that conveys touch, pressure, vibration, etc from skin to medulla to thalamus |
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Term
| What is the dorsal column that carries information from the lower half of the body called? |
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Definition
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Term
| What is the dorsal column that carries information from the upper half of the body (excluding the face) called? |
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Definition
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Term
| What secondary neuron would a touch sensory neuron from the lower half of the body terminate upon in the medulla? |
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Definition
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Term
| What secondary neuron would a touch sensory neuron from the upper half of the body (excluding the face) terminate upon in the medulla? |
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Definition
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Term
| What is the technical term for a secondary neuron axon "crossing over" to the other side of the medulla before ascending to the thalamus? |
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Definition
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Term
| What is the name of the thalamic nucleus that receives input from secondary neurons in the dorsal column/ medial lemniscal pathway? |
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Definition
Ventral posterial lateral (VPL) nucleus
(the tertiary neuron) |
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Term
| Where do tertiary neurons (VPL nucleus) of the dorsal column/ medial lemniscal pathway terminate? |
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Definition
| Cerebral cortex (aka somatosensory cortex) in the "body" region |
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Term
| List the neuron pathway in the dorsal column/ medial lemniscal pathway |
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Definition
1. Primary afferent neuron
2. Neuron goes up dorsal columns
3. First synapse in medulla on dorsal column nuclei
4. Secondary neurons decussate to opposite side of medulla and ascend to thalamus
5. Termination on VPL nucleus
6. VPL tertiary neurons terminate on somatosensory cortex |
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Term
| What would happen if the dorsal column/ medial lemniscal pathway was damaged? |
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Definition
| Numbness, loss of sensory information |
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Term
| Define the spinothalamic system |
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Definition
| The long tract that conveys pain information from the skin |
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Term
| Describe the primary afferent neuron in the spinothalamic system |
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Definition
| Its cell body is located in the dorsal root ganglion, and after entering the spinal cord it immediately synapses on the secondary neuron |
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Term
| Describe the secondary afferent neuron in the spinothalamic system |
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Definition
| In the spinal cord, they immediately decussate and ascend all the way to the VPL |
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Term
| Where do teriary neurons in the spinothalamic system terminate? |
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Definition
| In the "body" region of the somatosensory cortex |
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Term
| Describe the pathway of the spinothalamic system |
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Definition
1. Primary afferent neuron enters spinal cord
2. Termination on secondary neuron
3. Secondary axon decussate and ascend to VPL
4. Tertiary neuron terminate in "body" region of the somatosensory cortex |
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Term
| Define the corticospinal tract (aka pyramidal tract) |
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Definition
| Controls voluntary movement, particularly of the fingers and toes |
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Term
| Where is the primary cell body of the corticospinal tract located? |
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Definition
| In the cerebral cortex, in an area called the "primary motor cortex" |
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Term
| Describe the pathway of the primary neuron in the corticospinal tract |
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Definition
| They descend from the primary motor cortex to the lower medulla, where they decussate and continue to the spinal cord, where they terminate on alpha motor neurons |
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Term
| What would damage to the corticospinal tract (aka pyramidal tract) cause? |
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Definition
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Term
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Definition
| Any damage to the nervous system, due to stroke, tumor, blunt force trama, CSF, etc |
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Term
What general area in the lumbal spinal cord are the gracile fasciculus, lateral corticospinal tract, and spinothalamic tract located?
Picture on back |
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Definition
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Term
What general area in the cervical spinal cord are the gracile fasciculus, lateral corticospinal tract, cuneate fasciculus, and spinothalamic tract located?
Picture on back |
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Definition
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Term
If you were to take slices of the brainstem, where would the midbrain, pons, and medulla be? (rostal, middle, caudal)
Picture on back |
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Definition
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Term
What general area in the caudal medulla are the gracile fasciculus, lateral corticospinal tract, cuneate fasciculus, medial lemniscus, and spinothalamic tract located?
Picture on back |
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Definition
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Term
What general area in the middle medulla are the medial lemniscus, lateral corticospinal tract, and spinothalamic tract located?
Picture on back |
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Definition
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Term
What general area in the rostral medulla are the medial lemniscus, lateral corticospinal tract, and spinothalamic tract located?
Picture on back |
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Definition
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Term
What general area in the caudal pons are the medial lemniscus, lateral corticospinal tract, and spinothalamic tract located?
Picture on back |
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Definition
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Term
What general area in the middle ponsare the medial lemniscus, lateral corticospinal tract, and spinothalamic tract located?
Picture on back |
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Definition
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Term
What general area in the rostral pons are the medial lemniscus, lateral corticospinal tract, and spinothalamic tract located?
Picture on back |
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Definition
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Term
What general area in the caudal mibrain are the medial lemniscus, lateral corticospinal tract, and spinothalamic tract located?
Picture on back |
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Definition
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Term
What general area in the rostal midbrain are the medial lemniscus, lateral corticospinal tract, and spinothalamic tract located?
Picture on back |
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Definition
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