Anatomical study of bulbus oculi in Akkaraman Sheep

Okşar, Dilek; Orhan, İmdat; Alan, Aydın; Kose, Fatma; Düzler, Ayhan

doi:10.32707/ercivet.1015778

Cited by 3 publications

(6 citation statements)

References 8 publications

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“…It has been reported that the mean ML diameter of the cornea for both eyes of male and female Awassi sheep is between 24.09-21.99 mm and the mean DV diameter is between 16.87-18.66 mm (11). The mean value of ML diameter of cornea in Akkaraman sheep was 20.27 mm and DV diameter was 14.08 mm (12). In this study, the ML diameter of the cornea was found to be longer than the DV diameter in both sexes and both eyes of Akkaraman and Morkaraman sheep and it was observed that the cornea had an elliptical shape in these species in accordance with the literature.…”

Section: Histological Resultssupporting

confidence: 89%

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Comparative Investigation of Bulbus Oculi in Akkaraman and Morkaraman Sheep

Aksünger Karaavcı,

Dörtbudak,

Demircioğlu

et al. 2024

Dicle Üniversitesi Veteriner Fakültesi Dergisi

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Akkaraman and Morkaraman sheep breeds constitute more than half of the sheep breeds in Turkey. The eye is one of the most complex organs of the body in humans and animals that receives and processes light impulses from the environment, converts them into electrical signals through anatomical and physiological mechanisms, and transmits them to the visual cortex of the central nervous system. Anatomical-morphometric and histological investigations of the bulbus oculi in Akkaraman and Morkaraman sheep breeds will provide reference data for veterinary sciences and human medicine where sheep are used as models. For this purpose, a total of 80 bulbus oculi, right and left, from both breeds and sexes were used in the study. For morphometric measurements, 20 parameters were evaluated. Hematoxylin and eosin-stained preparations were examined under a light microscope after routine tissue monitoring procedures for histologic examination. In the statistical evaluation of the data, it was determined that significant differences according to sex were less in Akkaraman breed than in Morkaraman breed. In the comparison between the species, it was noteworthy that the differences in females were higher. It is thought that the results of the study will provide data both to the disciplines working in the field of veterinary medicine and to different disciplines, especially ophthalmology, as sheep are frequently used as a model in human medicine.

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Section: Histological Resultssupporting

confidence: 89%

“…The volume of the dissected bulbus oculi was calculated according to the Archimedes principle and the morphometric data of the bulbus oculi were measured by digital caliper and steromicroscope. The measurement parameters and their definitions are given in Table 2 (11,12). The length between the temporal and nasal endpoints of the lens.…”

Section: Methodsmentioning

confidence: 99%

Comparative Investigation of Bulbus Oculi in Akkaraman and Morkaraman Sheep

Aksünger Karaavcı,

Dörtbudak,

Demircioğlu

et al. 2024

Dicle Üniversitesi Veteriner Fakültesi Dergisi

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“…In our macroscopic observations, it was seen that the cornea ended before reaching the iris. This finding supported the claim of Oksar et al (2021), based on macroscopic findings, that the term angulus irido‐scleralis should be used instead of angulus irido‐cornealis. Although the formation of the angulus irido‐cornealis could not be seen macro anatomically, it was clearly defined in histologic examinations.…”

Section: Discussionsupporting

confidence: 90%

“…We found no evidence supporting Sisson's (1914) analogy of the cornea resting on the sclera like a watch glass in any of the animal species we looked at in our study. In the dorsal and ventral corneo‐scleral junctions of the bulbus oculi of all animals examined in our study, as stated by Prince et al (1960) and Oksar et al (2021), the sclera was found to be located on the outside (anteriorly) and the cornea on the inside (posteriorly). This joining pattern at the corneo‐scleral junction was valid for the entire bulbus oculi in rabbits.…”

Section: Discussionsupporting

confidence: 87%

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A new perspective on the corneo‐scleral junction with three types of microscopy techniques

Kose

Orhan

Alan

et al. 2023

Microscopy Res & Technique

Self Cite

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The conjunctions of the cornea and sclera in the eyes of donkeys, cattle, dogs, sheep, pigs and rabbits, regardless of gender, were examined in this study. No animals were specifically sacrificed for this investigation. Scanning electron microscopy, light microscopy, and dissecting microscopy were used in this research. In the limbus of all the animals investigated, the cornea and sclera fused in accordance with a pattern. At the corneo‐scleral junction, the sclera was situated anteriorly and the cornea posteriorly in the dorsal and ventral sections of the bulbus oculi. In the medial and lateral parts of the eyeball, the cornea and sclera were facing each other and interlaced. Pigmentation and the sulcus scleralis externus could be used to identify the macro‐and micro‐anatomical boundaries of the limbus. In addition, the cytoplasm of basal epithelial cells shrank, signaling the end of the corneal epithelium and the start of the conjunctival epithelium. The presence of Bowman's membrane in cattle and sheep eyes was definitely determined in histological examinations. Bowman's membrane in these animals came to an end at the limbus, which is where the conjunctival epithelium starts and the corneal epithelium ends. In all areas of the cornea, Bowman's membrane revealed irregular, abrupt thickening and thinning. The corneal epithelium was thick in the vertex and thinner towards the limbus, whereas Descemet's membrane was thin in the center (vertex) and thick in the periphery (near the limbus). In this study, pictures and diagrams were used to illustrate the general anatomical, histological, and morphometric characteristics of the limbus in the species under investigation. The data from our study showed that the limbus region of the bulbus oculi was narrow in the lateral and medial parts and wide in the dorsal and ventral parts. This was confirmed in the studied animals as a general rule. The width value will undoubtedly affect the number of cells covered by the regions. It is conceivable that these cells will play a significant role in the decision of where to perform surgical procedures in order to promote wound healing, giving doctors an advantage. In this circumstances, we think that the limbus should be studied in terms of clinical methods because it has different shapes depending on the species and the position of the bulbus.

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Kıvırcık Koyunlarında Bulbus Oculi’nin Morfometrik ve Makroanatomik Olarak İncelenmesi

Özüdoğru,

Kırış,

Baykalır

2024

MJAVL

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Çalışmada kıvırcık koyunlarında bulbus oculi’nin morfometrik ve makroanatomik olarak incelenmesi amaçlanmıştır. Bu amaçla Balıkesir’de mezbehanede kesilen 8 adet kıvırcık koyun kafası kullanıldı. Kafalar bütün halinde tartıldıktan sonra bulbus oculi’ler orbitadan diseke edildi ve sonra hassas terazi ile ağırlıkları saptandı. Daha sonra pupilla, lens, bulbus oculi ve cornea’ya ait 11 noktadan ölçümler yapıldı. Bulbus oculi’ye ait morfometrik analizler IBM®SPSS 22 paket programında yapılmıştır. Cinsiyet ile anatomik yapının sağ ve sol taraflarına ait ölçülerin verileri arasında istatistiksel fark olup olmadığı ve cinsiyet ile organların sağ ile sol olmasının birbirini etkileyip etkilemediği ve aralarında etkileşimin olup olmadığı çok faktörlü ve etkileşimli varyans analizi (Two-Way ANOVA) uygulandı. Kafa ağırlığının cinsiyet ayrımına göre analizi Mann Whitney U testi ile incelendi. İncelenen tüm özellikler (uzunluklar ve kalınlıklar) arasında bir ilişkinin istatistiksel olarak anlamlı varlığı ise Pearson korelasyon testiyle incelendi ve İstatistiksel anlamlılık düzeyi P ≤ 0,05 olarak kabul edildi. Yapılan analizler sonucu istatiksel olarak organların cinsiyet ile ilgili olarak sağ ve sol olmasının birbirini etkilemediği sonucuna varılmıştır. Korelasyon analizinde ise anlamlı bir ilişki olduğu görülmüştür.

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Anatomical study of bulbus oculi in Akkaraman Sheep

Cited by 3 publications

References 8 publications

Comparative Investigation of Bulbus Oculi in Akkaraman and Morkaraman Sheep

Comparative Investigation of Bulbus Oculi in Akkaraman and Morkaraman Sheep

A new perspective on the corneo‐scleral junction with three types of microscopy techniques

Kıvırcık Koyunlarında Bulbus Oculi’nin Morfometrik ve Makroanatomik Olarak İncelenmesi

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