The locus of optic nerve head representation in the retinotopic projection over nucleus geniculatus lateralis ventralis and nucleus griseum tectalis in the chick also lacks a retinal projection.
Recently we have demonstrated the presence of a gap in the avian retinotectal projection, that corresponds with the locus of retinotopic representation of the elongated optic nerve head. The present report describes an equivalent gap in the optic neuropiles of the avian ventral geniculate nucleus and griseum tectalis formation, detected after filling optic terminals anterogradely from the contralateral eye with peroxidase. A projection-less strip appears at the expected retinotopic position in both grisea intersecting radially all the strata of the corresponding neuropiles. It is speculated that a common synaptogenetic mechanism must account for these gaps.
Puelles
L
L
Department of Morphologic Sciences, Faculty of Medicine, University of Murcia, Spain.
Martinez
S
S
Martinez-de-la-Torre
M
M
D000818:Animals; D002645:Chickens / Q000033:anatomy & histology*; D005829:Geniculate Bodies / Q000033:anatomy & histology* / Q000166:cytology; D006735:Horseradish Peroxidase; D009900:Optic Nerve / Q000033:anatomy & histology* / Q000166:cytology; D012160:Retina / Q000166:cytology*; D012165:Retinal Ganglion Cells / Q000166:cytology*; D013477:Superior Colliculi / Q000033:anatomy & histology* / Q000166:cytology
D006735:Horseradish Peroxidase