Fig. 1.

Histochemical and immunohistochemical staining for Nissl substance and muscarinic type-2 (M2) receptors provides anatomic characterization of the pontine respiratory group in goats. A: sagittal sections (from a control goat) 4.9 mm lateral to the midline show the location in the rostral, dorsal pons of the lateral (LPBN) and medial parabrachial nuclei (MPBN) and the Kölliker-Fuse nucleus (KFN) relative to the cerebellar peduncle (SCP). B: transverse Nissl- and M2-stained sections from another control goat and a schematic to further illustrate the location of the LPBN, MPBN, and KFN. The superior and inferior colliculus (IC), trigeminal motor nucleus (5), basal pons (BP), facial nucleus (7), and nucleus ambiguus (NA) are labeled for reference. D, dorsal; V, ventral; R, rostral; C, caudal; M, medial; L, lateral.