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The embryonic pineal organ of lacerta vivipara part 1 differentiation of the cells of the sensory line the gradient of morphological differentiation






Journal of Neural Transmission 39(1-2): 139-174

The embryonic pineal organ of lacerta vivipara part 1 differentiation of the cells of the sensory line the gradient of morphological differentiation

During ontogenetic development, in the photoreceptor cells (P) secretory activity is not observed. From stage 38 on, the photoreceptive poles of these elements show a differentiation of disks while, from stage 37 on, their basal processes make synaptic contacts with dendritic outgrowths originating from intra-epithelial sensory nerve cells. The embryonic secretory rudimentary photoreceptor cells (SRP) are characterized by an intensive secretory activity. The photoreceptive poles of the SRP, like those of the P cells, show the differentiation of disks from stage 38 on. Only after birth, the outer segments of the SRP become rudimentary. Because of the absence of characteristic synaptic contacts between the basal processes of the SRP and dendrites of the sensory nerve cells the SRP probably become rudimentary where photoreceptivity is concerned. During the ontogenetic development of the pineal organ morphological signs pointing to regression of its photoreceptor function are not very marked. In showing a photoreceptive differentiation of the outer segments of the SRP, the present investigation agrees with previous phylogenetic studies and supports the concept of the presence of a sensory cell line in the vertebrate pineal organ.


Accession: 006670821



Related references

Meiniel, A., 1976: The embryonic pineal organ of Lacerta vivipara J. I. Differentiation of the cells of the sensory line (CSL). The gradient of morphological differentiation. This paper deals with the cytological development of the cells of the sensory line (CSL) of the pineal organ in Lacerta vivipara J. from the embryonic stage 30 on to the third day after birth. The general results are diagrammatically represented i...

Meiniel, A., 1976: Embryonic pineal organ of lacerta vivipara part 2 electron microscopic study of tritiated 5 hydroxy tryptophan incorporation in the secretory rudimentary photo receptor cells the gradient of biochemical differentiation. The biosynthesis of indoleamines in L. vivipara [lizard] embryos stages 36-40 was studied. Ultrastructural (EM) autoradiographic studies revealed a selective incorporation and metabolism of 3H-5-HTP [3H-5-hydroxytryptophan] in 1 of the 2 sensory c...

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Meiniel, A., 1974: Differentiation of the external segment of cells from the sensory line in embryonic epiphysis cerebri of Lacerta vivipara J. (Reptilia; Lacertilia). Comptes Rendus Hebdomadaires des Seances de L'academie des Sciences. Serie D: Sciences Naturelles 278(10): 1389-1392

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