Castration and testosterone induced changes in the pinealocytes of Roseringed Parakeet, Psittacula krameri, during different phases of the annual testicular cycle

Maitra, Saumen Kumar; Dey, Mamata

doi:10.1016/s0940-9602(11)80520-0

Cited by 4 publications

(2 citation statements)

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“…The extensive study of pineal morphology has been performed in some selective avian species such as chicken, Gallus domesticus (Beattie and Glenny, 1966;Fujie, 1968;Bischoff, 1969), white crowned sparrow Zonotrichia leucophrys gambellii (Oksche et al, 1972), domestic parakeet Melopsittacus undulatus (Quay et al, 1968), and the rose ringed parakeet Psittacula krameri (Maitra and Dey, 1994). Cells with photoreceptive features commonly occur in pineal of sparrows and some chickens, whereas secretory features occur in the magpie Pica pica (Collin, 1971), domestic parakeet (Quay et al, 1968), and in certain chickens (Bischoff, 1969).…”

Section: Introductionmentioning

confidence: 99%

“…Interestingly, the proximodistal orientation of intrapineal follicular and parenchyma cells were also noted in a few avian species (Quay, 1965). The physiology of the pineal gland has been studied extensively in tropical diurnal birds on the basis of morphology (Chakravarty, 1980;Chaudhuri and Maiti, 1989;Haldar and Ghosh, 1991;Maitra and Dey, 1994) and secretory activity (Dubey and Haldar, 1997), while correlating it with different phases of gonadal function. Nevertheless, until recently the existence of a pineal organ for the nocturnal birds was controversial.…”

Section: Introductionmentioning

confidence: 99%

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Comparative view of pineal gland morphology of nocturnal and diurnal birds of tropical origin

Haldar

Bishnupuri

2001

Microscopy Res & Technique

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Although having a similar developmental pattern, the pineal gland of tropical birds varies in shape, size, and morphology, probably more than any other part of the avian brain. Following the old classification, we noted a solid follicular (transitional) type of the pineal gland in the nocturnal bird Athene brama, and a tubulo-follicular and elongated tubular types of pineal gland in diurnal birds Perdicula asiatica and Euroloncha punchulata, respectively. Detailed light (LM) and electron microscopic (EM) studies of the pineal gland from these tropical birds revealed the presence of a well-developed, functionally active gland in nocturnal birds (contrary to reports available until now). Unlike diurnal birds, the nocturnal bird A. brama has no deep pineal in the posterior region (near the habenular commissure). It could be that the deep encephalic receptors have no/fewer functions in nocturnal birds. At present, we were unable to define the significance of deep pineal in these tropical avian species. A notable difference in the proximodistal orientation of intrapineal follicles and parenchymatous cells was noted among these birds due to different habitats. Ultrastructurally, the pinealocytes exhibited great similarities in terms of secretory organelles, except for the presence of some peculiar membranous structure in E. punchulata. The pinealocytes have rudimentary photoreceptive features (e.g., outer segment) along with cytoplasmic organelles for secretory activity, suggesting both photosensory and photosecretory types of function. The present study also suggests more heterogenicity in pineal gland morphology (cellular architecture) among diurnal birds than the nocturnal one.

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