As one of the most important diffused brain modulatory systems, the nucleus locus coeruleus (LC) receives most of its afferents from the nucleus paragigantocellularis (PGi) and plays a major role in the control of drug dependence and some emotional and exciting states. For detailed investigation of the effect of morphine on relationship between these two brain stem nuclei, the activity of the r...

Injection of horseradish peroxidase into the secondary gustatory nucleus of the green sunfish, Lepomis cyanellus, resulted in retrogradely filled neurons bilaterally in the viscerosensory column of the brainstem and in anterograde transport revealing ipsilateral terminal fields in the preglomerular tertiary gustatory nucleus, the nucleus of the torus lateralis and the central and periventricula...

The diencephalic nuclei known as the lateral geniculate and rotundus in goldfish appear to belong to the pretectal region. They do not project to the telencephalon. A combination of degeneration and horseradish tract-tracing experiments show that that the latter nucleus projects caudally to the so-called mammillary body and to a precerebellar cell group-nucleus lateralis valvulae.

In birds, optic flow is analyzed by two retinal-recipient nuclei: the nucleus of the basal optic root (nBOR) of the accessory optic system (AOS), and the pretectal nucleus, lentiformis mesencephali (LM). Previous anatomical studies have shown that both of these nuclei have descending projections to structures involved in oculomotor, head movement, and postural control. In this report, using bio...

Key words: optic tectum projections-longnose gar-anterograde degeneration-pretectal nuclei SUMMARY Efferent projections of the optic tectum were studied with the anterograde degeneration method in the longnose gar. Ascending projections were found bilaterally to 3 pretectal nuclei-the superficial pretectal nucleus, nucleus pretectalis centralis and nucleus pretectalis profundus-and to a number ...

The occurrence and distribution of monoamine-(MA) containing neurons and fibres in the brain of Carassius was investigated by formaldehyde-induced fluorescence (FIF) histochemistry (Falck-Hillarp technique). Many brightly green-fluorescent nerve cell perikarya were found in the nucleus dorsolateralis and ventromedialis, in the nucleus posterioris periventricularis, in the nucleus recessus later...

The auditory (cochlear) ganglion cells of the alligator lizard (Gerrhonotus multicarinatus) give rise to two types of peripheral fibers: tectorial fibers, which contact hair cells covered by a tectorial membrane, and free-standing fibers, which contact hair cells without a tectorial membrane. To determine the central projections of these fibers, we applied intracellular and extracellular inject...