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Postnatal development of the dog pineal gland: electron microscopy
J Calvo1, J Boya, J E García-Mauriño
1Department of Histology, Faculty of Medicine, University Complutense, Madrid, Spain.
Journal of Pineal Research
|January 1, 1990
Summary
The dog pineal gland
Area of Science:
- Veterinary Anatomy
- Developmental Biology
- Histology
Background:
- The pineal gland's ultrastructure and cellular development are crucial for understanding its endocrine functions.
- Limited information exists on the precise timeline of canine pineal gland differentiation post-birth.
Purpose of the Study:
- To describe the ultrastructural changes in the dog pineal gland from birth to seven months.
- To detail the chronological differentiation of pinealocytes, pigmented cells, and astrocytes.
Main Methods:
- Transmission electron microscopy was used to examine pineal gland tissues.
- Histological analysis was performed on samples collected from the first postnatal day to seven months.
Main Results:
- Immature cells with glycogen were present in early postnatal stages, alongside nerve fibers.
- Pinealocytes and pigmented cells appeared by the fourth postnatal day; astrocytes by the tenth.
- Cellular differentiation was complete by the second postnatal month, though immature cells persisted until one month.
Conclusions:
- Canine pineal gland development involves distinct stages of cell differentiation.
- The ultrastructure matures significantly within the first two postnatal months.