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Photomicrographs of the pontomesencephalic cholinergic cell groups of Sus scrofa domesticus. ChAT-ir neurons and fibers (A, black arrows) of the parabigeminal (PB), pedunculopontine nucleus (PPN), and the laterodorsal tegmental nucleus (LDT). ChAT-ir neurons and fibers within the PPN (B), LDT (C) and PB (D). Scale: 1000 μm A; 25 μm B, C, D. Anatomic orientation: R= rostral, C= caudal, L= lateral, M= medial.
