Comparative Topographical Description of the Central Nervous System of the Macaw (Ara ararauna) and the Owl (Tyto furcata)

Melo, Luana Felix de; Azarias, Felipe Rici; Walther, Maria Eugênia Furtado; Aquino, Julia Bastos de; Rodrigues, Rosangela; Melo, Alan Ferraz de; Stapait, Helder Telles; Lopes, Eymar Sampaio; Rici, Rose Elí Grassi

doi:10.4067/s0717-95022022000300860

Int. J. Morphol.

2022

DOI: 10.4067/s0717-95022022000300860

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Comparative Topographical Description of the Central Nervous System of the Macaw (Ara ararauna) and the Owl (Tyto furcata)

Luana Felix de Melo¹,

Felipe Rici Azarias

Maria Eugênia Furtado Walther³

et al.

Abstract: Comparative Topographical Description of the Central Nervous System of the Macaw (Ara ararauna) and the Owl (Tyto furcata)Descripción Topográfica Comparativa del Sistema Nervioso Central del Guacamayo (Ara ararauna) y el Búho (Tyto furcata

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Brain Gross Anatomy and Cerebellar Histology of the Cattle Egret (Bubulcus ibis)

Azeez,

Omirinde,

Chomo

et al. 2023

Folia Veterinaria

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The structural parts of brain are similar in all vertebrates, but they differ in their complexity and organization. The avian brain for instance, is organised differently compared to mammals, with variations existing in the relative size and location of their structures. The cattle egret (Bubulcus ibis) is a cosmopolitan avian species native to Africa. Despite their economic importance as excellent sentinels in assessing environmental pollutants, there is a dearth of information on their neuroanatomy. Hence, we here investigated their gross morphological features and morphometric parameters, and the cerebellar histology. Twelve transcardi-ally perfused juvenile cattle egrets were studied, with the body and brain weights and brain linear measurements considered. The brain weight constituted 0.46 % of the total body mass, with a strong positive correlation recorded between the body and brain weights (r = 0.9204). Morphologically, the brain was lissencephalic, with the corpus callosum absent and the olfactory bulbs rudimentary with no discernible division into the olfactory bulb, olfactory tract and olfactory lobe. We observed prominent sagittal eminence and vallecula telencephali, as well as an obvious fovea limbica on the dorsal and lateral surfaces of the cerebral hemispheres, respectively. The diencephalic structures were completely covered by telencephalon, with the pineal gland occupying the polygonal space between cerebrum, optic lobe and cerebellum. The mesencephalic tectum appeared as a large oval bilaterally bulging structure with prominent optic tracts and constituted the bulk of the midbrain. There was a dorsal extension of the fourth ventricle into the cerebellum known as the ventriculus cerebelli and the cerebellar histology presented a persistent external granular layering suggestive of a potential for adult neurogenesis. Our data has added relevant literature on the cattle egret brain and could prove useful in comparative, developmental and evolutionary avian neuroanatomy.

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Brain Gross Anatomy and Cerebellar Histology of the Cattle Egret (Bubulcus ibis)

Azeez,

Omirinde,

Chomo

et al. 2023

Folia Veterinaria

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show abstract

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Comparative Topographical Description of the Central Nervous System of the Macaw (Ara ararauna) and the Owl (Tyto furcata)

Abstract: Comparative Topographical Description of the Central Nervous System of the Macaw (Ara ararauna) and the Owl (Tyto furcata)Descripción Topográfica Comparativa del Sistema Nervioso Central del Guacamayo (Ara ararauna) y el Búho (Tyto furcata

Cited by 1 publication

References 15 publications

Brain Gross Anatomy and Cerebellar Histology of the Cattle Egret (Bubulcus ibis)

Brain Gross Anatomy and Cerebellar Histology of the Cattle Egret (Bubulcus ibis)

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