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The pineal complex and its relationship to other epithalamic structures

J C Gregorek, H R Seibel, R J Reiter

    Acta Anatomica
    |January 1, 1977
    PubMed
    Summary
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    The rodent pineal complex includes a pineal gland and a pineal sac. The pineal sac

    Area of Science:

    • Neuroscience, Comparative Anatomy

    Background:

    • The pineal complex in rodents comprises a pineal gland and a pineal sac.
    • The pineal sac is continuous with the third ventricle's choroid plexus and resembles it histologically.

    Purpose of the Study:

    • To investigate the anatomical relationship between the pineal sac and pineal gland across different rodent species.
    • To evaluate the potential role of the pineal sac in pineal secretion.

    Main Methods:

    • Light microscopy was used to examine the pineal complex in various rodent species.
    • The contiguity of the pineal sac with pineal parenchyma was assessed.

    Main Results:

    • The pineal sac's relationship with the pineal gland varies significantly among species.
    • In some species, the pineal sac abuts the pineal gland, while in others, it contacts only small areas or not at all (e.g., albino rat).

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  • Venous drainage of the pineal gland consistently occurs via the vena cerebri magna into the superior sagittal sinus.

    • Conclusions:

    • The variable anatomical association suggests the pineal sac may not be the primary route for pineal secretion.
    • Pineal gland venous drainage is consistently directed towards the superior sagittal sinus.