Tectum opticum development in embryonic quail (Coturnix japonica) and the role of HSP70 in the developmental process

Dilem Gülece Ermutlu; Serap İlhan Aksu; Turgay Deprem; Serap Koral Taşçi; Şahin Aslan; Rumeysa Nur Aslan

doi:10.2478/jvetres-2026-0030

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Tectum opticum development in embryonic quail (Coturnix japonica) and the role of HSP70 in the developmental process

Journal of Veterinary Research

Volume 70 (2026): Issue 2 (June 2026)

By: Dilem Gülece Ermutlu , Serap İlhan Aksu , Turgay Deprem , Serap Koral Taşçi , Şahin Aslan and Rumeysa Nur Aslan

Open Access

|Jun 2026

Figures & Tables

Histological structure of a Japanese quail tectum opticum on embryonic days 7 (E7) and 9 (E9). A – E7; B – E9. SO – stratum opticum; SGFS – stratum griseum et fibrosum superficiale; SGC – stratum griseum centrale; SAC – stratum album centrale; SGP – stratum griseum periventriculare; SFP – stratum fibrosum periventriculare; Ov – optic ventricle; P – pia mater. Visualised with Crossmonn’s modified triple staining

Graphic representation of Japanese quail tectum opticum layer thicknesses. E7–16 – embryonic days 7–16; SO – stratum opticum; SGFS – stratum griseum et fibrosum superficiale; SGC – stratum griseum centrale; SAC – stratum album centrale; SGP – stratum griseum periventriculare; SFP – stratum fibrosum periventriculare

Histological structure of the stratum griseum et fibrosum superficiale (SGFS) layer of a Japanese quail tectum opticum on embryonic day 12. a–j – sublayers from deep to superficial. Visualised with Crossmonn’s modified triple staining

Neurons in the stratum griseum centrale (SGC) layer of a Japanese quail tectum opticum on embryonic day 11. Ov – optic ventricle; UN – unipolar neuron; G – glial cells; FN – fusiform neuron. Crossmonn’s modified triple staining

Histological structure of the stratum griseum periventriculare (SGP) and stratum fibrosum periventriculare (SFP) layers of a Japanese quail tectum opticum on embryonic days 7 (E7) and 12 (E12). A – E7; B – E12. N – spherical neuron; V – blood vessel; G – glial cells. Visualised with Crossmonn’s modified triple staining

Heat-shock protein 70 immunostaining in a Japanese quail tectum opticum. A – on embryonic (E) day 7; B – E9; C – E10; D – E11. SO – stratum opticum; SGFS – stratum griseum et fibrosum superfiiciale; SFP – stratum fibrosum perivenriculare; SGP – stratum griseum periventriculare; SAC – stratum album centrale; SGC – stratum griseum centrale; P – pia mater; F – fusiform neuron; G – glial cells; PN – pyramidal neuron; U – unipolar neuron

Heat-shock protein 70 immunostaining in a Japanese quail tectum opticum. A – on embryonic (E) day 13; B – E14; C – E15; D – E16. SFP – stratum fibrosum perivenriculare; SGFS – stratum griseum et fibrosum superficiale; SGC – stratum griseum centrale; G – glial cells; F – fusiform neuron; PN – pyramidal neuron; U – unipolar neuron; N – neurons showing high immunoreactivity

Tectum opticum layer thickness measurements in Japanese quail between embryonic days 7 (E7) and 16 (E16)

	SO	SGFS	SGC	SAC	SGP	SFP
E7	113.7±12.7^a	849.2±41.8^a	1028.1±112.4^a	503.5±38.5^a	316.4±60.9^a	287.6±37.2^a
E8	99.2±13.1^b	910.7±52.5^a	986.22±103.8^a	578.63±51.8^b	215.92±28.1^b	192.11±41.2^b
E9	106.6±19.8^a	1865.4±65.5^b	1012.74±102.5^a	606.2±40.5^b	185.9±19.8^b	187.2±19.6^b
E10	111.15±9.3^a	1820±189.8^b	1015.5±87.8^a	669.61±85.2^c	171.63±19.3^b	189.44±22.7^b
E11	92.62±9.1^b	1343.9±55.9^c	1222.31±103.3^a	494.82±50.9^a	174.88±26.8^c	143.51±21.1^c
E12	112.1±9.4^a	1562.2±39.9^c	987.3±93.7^a	490.32±39.2^a	140.7±16.9^d	145.3±33.2^d
E13	97.4±10.2^b	1780.2±65.6^b	1770.9±88.6^b	478.9±68.2^a	148.3±21.1^c	137.23±26.7^c
E14	93.4±14.4^b	2085.3±105.8^d	1607.82±186.1^b	465.4±48.2^a	128.44±23.5^d	109.88±11.9^d
E15	91.7±11.9^b	2226.8±102.8^d	1532.8±161.4^b	486.4±52.3^a	125.63±15.5^d	111.17±16.8^d
E16	79.4±13.2^d	2324.11±111.5^d	2318.73±120.1^c	490.71±3.1^a	119.75±14.9^d	101.64±15.4^d

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DOI: https://doi.org/10.2478/jvetres-2026-0030 | Journal eISSN: 2450-8608

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Language: English

Page range: 313 - 320

Submitted on: Jan 12, 2026

Accepted on: Jun 16, 2026

Published on: Jun 30, 2026

Published by: National Veterinary Research Institute in Pulawy

In partnership with: Paradigm Publishing Services

Keywords:

embryonic development,

histology,

HSP70,

quail,

Related subjects:

Microbiology and virology,

Life sciences,

Life sciences, other

© 2026 Dilem Gülece Ermutlu, Serap İlhan Aksu, Turgay Deprem, Serap Koral Taşçi, Şahin Aslan, Rumeysa Nur Aslan, published by National Veterinary Research Institute in Pulawy
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 70 (2026): Issue 2 (June 2026)

Tectum opticum development in embryonic quail (Coturnix japonica) and the role of HSP70 in the developmental process

Figures & Tables

Fig 1.

Fig 2.

Fig 3.

Fig 4.

Fig 5.

Fig 6.

Fig 7.

Tectum opticum layer thickness measurements in Japanese quail between embryonic days 7 (E7) and 16 (E16)

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