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Thin cap over posterior horn.
- Pain reception (from lateral spinothalamic tract)
- "Substantia Gelatinosa"
Lamina III, IV
- Cell bodies called "Nucleus Proprius"
- Proprioception, Pressure, Temp sensations
- Cell bodies send axons to contralateral spinothalamic tracts
- Cervical Vertebrae - lateral "Formatio Reticularis" sends multi-directional fibers
- Most anterior portion of dorsal horn
- NOT present at all levels
- Intermediate gray area of anterior (and lateral) horns
- Many descending tracts synapse here
- "Nucleus Dorsalis" (aka Clarke's Nucleus) from C8 thru L3
- Sends axons to ascending Posterior Spinocerebellar Tracts
- When Lateral Horns are present"Intermediolateral Nucleus"
- (T1-L2: preganglionic sympathetic neurons) and (S2-4: preganglionic parasympathetic neurons)
- Anterior horn
- Delta & Gamma motor neurons
- Most medial tract has descending tracts
- Class A alpha motor neurons - largest and fastest in body
- Skeletal muscle innervated from these neurons
- Disconnected islands
- Surrounds central canal
- Contains anterior and posterior "gray commissures"
Where is the Intermediolateral Nucleus found?
Rexed Lamina VII - contributes preganglionic neurons to sympathetics (T1-L2) and parasympathetics (S2-4)
Where is Clarke's Nucleus found?
C8 thru L3 cord level
Where is Formatio Reticularis found?
ONLY in cervical area of Lamina V
The Sacral Parasympathetic Nucleus is found in this lamina?
Lamina VII at S2-4 levels