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The pineal gland of the horse. Morphological and histochemical results. (With notes on the donkey and mule pineal).
Bruno Cozzi,B. Ferrandi +1 more
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The horse pineal gland has been investigated by morphological and histochemical methods, with particular care given to the cellular types, to the eventual presence of neurosecretory activity and to the nature of the pigments.Abstract:
The horse pineal gland has been investigated by morphological and histochemical methods. Particular care has been given to the cellular types, to the eventual presence of neurosecretory activity and to the nature of the pigments. Even in the horse pineal, it is possible to distinguish two populations of pinealocytes, morphologically but not histochemically distinct. A great number of pinealocytes are positive for the Masson- Hamperl reaction, and for Gomori- Bargmann 's chromic haematoxylin-phloxine and Gomori's paraldehyde-fuchsin. Along the connective septa, many brown- blackish pigmented cells were present; their pigment was positive for the Lillie and the Masson-Fontana reactions for the determination of melanin pigment. Another type of pigmented cells, carrying a brown yellowish pigment of lipofuscin nature was present, particularly in older animals, along the connective septa.read more
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Evolutionary and biomedical consequences of internal melanins.
Sylvain Dubey,Alexandre Roulin +1 more
TL;DR: This work has shown that the amount of melanin deposited on the external body surface is correlated with the amount located inside the body, and raises the possibility that internal melanin plays more important physiological roles in dark than light‐colored individuals.
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Cell types in the pineal gland of the horse: an ultrastructural and immunocytochemical study.
TL;DR: Morphological and immunocytochemical features support classifying them as astrocytes, probably protoplasmic, and the presence of a cavity lined with pericytes is a consistent finding and may relate to the third ventricle.
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Pinealitis accompanying equine recurrent uveitis.
TL;DR: The pineal gland of a horse that was killed because it had become blind during an episode of uveitis was examined and the clinical history and histopathology of the eyes were consistent with post-leptospiral equine recurrent Uveitis.
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Circadian and seasonal rhythms of melatonin production in mules (equus asinus equus caballus)
TL;DR: The results reported here indicate the persistence of brain structures able to receive and transduce environmental signals in the mule, a genetically sterile mammalian hybrid.
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Immunopathology of pineal glands from horses with uveitis.
TL;DR: These pineal gland changes suggest that the pinealitis associated with equine uveitis is transient just as the Uveitis of these horses is recurrent.