Retinal Ganglion Cell and Epiphysis (Pineal Gland, Third Eye)

Altınbay, Deniz

doi:10.5336/ophthal.2019-66841

Cited by 1 publication

(1 citation statement)

References 23 publications

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“…The pineal gland, resembling a pine cone in the triangular region formed by the cerebral hemispheres and the cerebellum, is the only organ in the brain that has no symmetry between the parietal bones. Since it functions like a primitive eye responsible for the perception of light, it is also called the parietal eye, primitive eye, third eye or apical eye (Altınbay, 2020; Kumar & Meshram, 2020; Tainika & Bayraktar, 2022). Birds have a very different pineal gland structure morphologically and cytologically (Hao et al., 2021; Petrusewicz‐Kosinska et al., 2019; Prusik, 2022; Ralph, 2020; Sapède & Cau, 2013).…”

Section: Introductionmentioning

confidence: 99%

Embryonic development of the chick pineal gland throughout the incubation periods

Colakoglu,

Selcuk

2023

Anat Histol Embryol

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Birds have a very different pineal gland structure morphologically and cytologically. The structure of the organ shows significant changes during the incubation periods. This study, which follows the embryological development of the pineal gland and makes histomorphometric measurements of the cellular elements that make up the gland parenchyma, is a current reference for studies in these areas. These brains were taken from 24 Babcock White Leghorn chick embryos on the 10th, 13th, 16th and 21st days of incubation. At 10th embryonic day, the pineal recess was in the structure of an elongated pineal canal. Solid rosette‐shaped cell clusters were transforming into round vesicles with a small lumen. These vesicles had developed into larger, oval‐shaped follicles with a well‐defined central lumen. On 13th day, it was observed that the number and development of follicles increased considerably. The pineal gland showed a follicular‐solid structure in 16th day embryos. While the mean follicle diameter was determined as 123.46 ± 13.28 μm on the 10th embryonic day, the highest value was measured as 187.62 ± 7.37 μm on the hatching day (p < 0.05). While the mean follicle area had the lowest value in the 10th day embryos, it was determined that this value gradually increased compared to the advancing embryonic days (p < 0.05). As conclusion, it is thought that this study provides new data to the literature about pineal gland development by monitoring the histological and histomorphometric developments of chick pineal gland in different incubation periods.

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