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Nucleus laminaris (NL) is the site at which the timing of sounds arriving in the 2 ears is compared in the auditory system of the barn owl. Earlier studies have reported vitamin D-dependent calcium binding protein (CaBP)-like immunoreactivity in the somata of NL. We report here that CaBP-like immunoreactivity stains the terminal field of NL. The specific CaBP immunoreactivity is localized to a dense plexus of fibers that have bouton-like swellings, usually around unstained somata. This type of immunoreactivity is found in a restricted portion of the central nucleus of the inferior colliculus (ICc), in the anterior division of the ventral lateral lemniscal complex (VLVA), and in the superior olivary nucleus (SO), all of which have been shown by anterograde transport of 3H-proline to be innervated by NL. The immunoreactivity is absent from the posterior division of ventral lateral lemniscal complex and from the region that surrounds the portion of ICc innervated by NL. A restricted lesion in NL results in a localized deficit in immunoreactivity in those regions of ICc and VLVA that are known to be innervated by the lesioned area of NL. In adjacent sections processed by the Fink-Heimer method, degenerating axons are present in the region of the deficit in immunoreactivity.

Calcium binding protein-like immunoreactivity labels the terminal field of nucleus laminaris of the barn owl