Term
| What nerves synapse in Lamina 1 and 5? |
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Definition
| Nociceptive small diameter and unmyelinated axons |
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Term
| What kind of axons synapse in laminae 3 and 4? |
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Definition
| Non-noxious large myelinated axons |
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Term
What kind of axons synapse in Laminae 2?
What else is important about laminae 2? |
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Definition
Nociceptive input from large myelinated axons.
Laminae 2 has lissauer's tract that can ascend and descend levels to form collaterals.
also knows as the substantia gelitinosa.
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Term
| What is found in Lamina 6? |
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Definition
Receives motor and proprioceptive input.
Serves as the base of the dorsal horn. |
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Term
| What is found in lamina 7? |
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Definition
| IMLCC, Clarkes column, sacral autonomic nuclei. |
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Term
What is the clarks column and where is it located?
What is its role? |
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Definition
From c8 --> L2 in the grey matter lamina 7.
Clarke's column sends axons up the dorsal spinocerebellar tracts for proprioception. |
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Term
| What does lamina 8 contain? |
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Definition
| motor interneurons to integrate segmental and descending signals. |
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Term
| What does lamina 9 contain? |
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Definition
The main somatic motor area of the grey matter.
Contains large alpha and small gamma motor neurons.
Contains the phrenic nucleus (C3-C5).
Organized somatotopically. |
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Term
| Where is the spinal accecory nucleus? |
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Definition
| C1-C5 and is an extension of grey matter into where the IMLCC would be. Controls the sternocleidomastoid and trapezius. |
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Term
| Nuclear bag fibers in muscle spindles detect what? |
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Definition
| Dynamic changes in muscles such as rate of extension. |
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Term
| What is the difference between extrafusal and intrafusal muscle fibers? |
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Definition
Extrafusal do not have muscle fibers associated with them.
Intrafusal muscle fibers have spindles in line with them. |
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Term
| What are golgi tendon organs used for and where are they located? |
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Definition
They are the counterpart to spindles and prevent overcontraction.
Found at the myotendinous junction. |
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