Ultrastructural study of the embryonic development of the pineal gland of the chicken (&lt;i&gt;Gallus gallus&lt;/i&gt;)

Calvo, J.; Boya, J

doi:10.1159/000144996

Cited by 26 publications

(8 citation statements)

References 9 publications

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“…While the growth of the pineal gland outline is quite rapid due to follicular development until the 12th day of incubation, it is stated that the gland size does not change after this stage as the pineal parenchyma begins to transform from follicular type to solid type (Calvo & Boya, 1978, 1979). As a result of the data obtained from this study, there was a statistical difference between the 10th day of incubation and the other embryonic days in terms of gland size, but the lowest value was determined as 992.03 ± 61.30 μm on the 10th embryonic day.…”

Section: Discussionmentioning

confidence: 99%

“…Vesicles, which had a central lumen, develop from rosettes formed by oval‐shaped cells. Follicles are formed by thickening of the vesicle wall and arranging the cells into two cell layers (Calvo & Boya, 1978, 1979; Przybylska‐Gornowicz et al., 2012). In addition, Prusik (2022) reveals the presence of branched follicles in the epiphyseal parenchyma in turkeys, unlike chickens.…”

Section: Discussionmentioning

confidence: 99%

“…(2012) state that pinealocytes forming the follicle wall in gulls have follicular and parafollicular cells according to their contact with the lumen. While the follicular and parafollicular regions formed by these cell organizations are also distinguished in chickens (Boya & Zamorano, 1975; Calvo & Boya, 1978, 1979), it is stated that this situation is not seen in turkeys (Prusik, 2022). Calvo and Boya (1979) report that new cellular rosettes and new follicles are formed from parafollicular cells.…”

Section: Discussionmentioning

confidence: 99%

“…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). The structure of the organ shows significant changes during the incubation periods (Calvo & Boya, 1978, 1979; Jov'e et al., 1999; Möller & Möller, 1990; Ohshima & Matsuo, 1988). As a result of the studies, it has been reported that the pineal gland has a follicular‐solid type parenchyma in young chickens (Boya & Calvo, 1978, 1979, 1980; Lewczuk et al., 2012; Petrusewicz‐Kosinska et al., 2019).…”

Section: Introductionmentioning

confidence: 99%

“…The first round‐oval follicles with their own central lumens are encountered on the 5th embryonic day. Secondary and tertiary follicles develop with the growth and budding of these follicles (Calvo & Boya, 1978, 1979; Jov'e et al., 1999), which continue to develop until the 12th embryonic day (Calvo & Boya, 1978, 1979). Follicular cells, which are cut off from the lumen, settle in the interfollicular areas and form the epiphyseal parenchyma (Calvo & Boya, 1978).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Embryonic development of the chick pineal gland throughout the incubation periods

Colakoglu,

Selcuk

2023

Anat Histol Embryol

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Ultrastructural study of the embryonic development in the rat pineal gland

Calvo

Boya

1981

Anat. Rec.

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The ultrastructure of the albino rat embryo pineal gland was studied from day 13 of development through birth. In the first stages (13-16.5 days of development) the pineal evagination presents a barely differentiated epithelium. From 17 days onward the transformation of the pineal gland from a tubular evagination into a compact organ occurs. The obliteration of the recess takes place by means of two mechanisms: (a) multiple foldings of the epithelium which determine an approximation and fusion of the walls of the recess, and (b) occupation of the lumen by cells extruded from the pineal epithelium. Embryos of 18-21 days of gestation still show remains of the pineal recess. From day 16.5 onward elements of the pineal parenchyma have been found outside the pineal epithelium contour. They contact with the mesenchymal cells without a basal lamina separating both elements. Day 20 marks the beginning of recognizable differentiation of pineal cellular types. However, in the newborn rat these types are not yet clearly established.

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