Slide 22: Upper Pons

Identify:

• Lateral Lemniscus (LL)
• Superior Cerebellar Peduncle (SCP)
• Central Tegmental Tract (CTT)
• Mesencephalic Trigeminal Tract MesT)
• Locus Ceruleus (LC, noradrenergic (NA) neurons)
• Periaqueductal Gray (PAG)
• Medial Longitudinal Fasciculus (MLF)
• Dorsal Raphe Nucleus (DR)
• Superior Central Raphe Nucleus (SCR)
• Decussation of the Trochlear Nerves (4DX)

Note:

• This is a high power view of the previous slide.
• The darkly staining, pigmented cells of the Locus Ceruleus (LC) have widespread noradrenergic (NA) projections.
• The Dorsal Raphe (DR)and Superior Central Raphe (SCR) Nuclei have widespread serotonergic (5HT) projections.
• The Trochlear Nuclei lie rostral to the level of the Trochlear Decussation.