Efferent projections of the visual Wulst upon the nucleus of the basal optic root in the pigeon

Rostral Wulst in passerine birds. I. Origin, course, and terminations of an avian pyramidal tract

“…Consequently, in addition to the labeling of rostral Wulst efferents, there was in these cases some labeling of efferents originating in the visual Wulst, which was indicated by the presence of terminal fields in visually related nuclei in the diencephalon and mesencephalon, e.g., the ventral lateral geniculate nucleus, some of the pretectal nuclei, the optic tectum (predominantly laminae 13 and 4), and the dorsal cap of the nucleus of the basal optic root. In cases receiving smaller injections in ventral HA that did not encroach on the visual Wulst, these projections to visual nuclei, which have been well described in other avian species (Adamo, 1967;Karten et al, 1973;Bravo and Pettigrew, 1981;Rio et al, 1983;Miceli et al, 1987;Casini et al, 1992), were not observed, and in the present report they will be further referred to only in passing.…”

“…On entry to the diencephalon, the tract formed two rami, as previously described (e.g., Huber and Crosby, 1929;Rio et al, 1983). The dorsal ramus (TSMd; Fig.…”

Influence of the behavioural context on the optocollic reflex (OCR) in pigeons (Columba livia)

“…Interactions through these connections (Gioanni et al, 1983a,b;Gioanni et al, 1984;Gu et al, 2001;Wang et al, 2001;Crowder et al, 2003b) may participate in selecting the appropriate neurones, especially concerning their directional properties. The nBOR and nLM also receive direct telencephalic projections from the visual wulst (Micelli et al, 1979;Rio et al, 1983;Wylie et al, 2005). The function of these projections is still uncertain.…”

Rostral wulst of passerine birds: II. Intratelencephalic projections to nuclei associated with the auditory and song systems

“…Extratelencephalic projections originating in HA of the visual wulst have been documented amply (Karten et al, 1973;Bravo and Pettigrew, 1981;Rio et al, 1983;Miceli et al, 1987;Casini et al, 1992;Shimizu et al, 1995), and a pyramidal-like tract originating in the rostral HA has been delineated recently (Wild and Williams, unpublished observations). Descriptions of the intratelencephalic projections of rostral HA, however, have been limited to certain aspects of the somatosensory system in pigeons (Wild, 1987;Funke, 1989b).…”