article · Anatomia Histologia Embryologia
An anatomical, histological, and microscopic investigation examines the oropharyngeal cavity of the hooded crow. The cavity displays an elongated triangular shape, housing a non-protruding tongue with a bifid apex. A transverse papillary crest divides the lingual body, which features a rostral median groove, from the lingual root. Behind this, the laryngeal mound displays a midline cleft bordered by pharyngeal papillae, while the palate exhibits five ridges along with a choanal cleft and infundibular slit. Microscopic analysis confirms a heavily keratinised dorsal lingual epithelium featuring a rostral lingual nail, supported along the body and root by the entoglossum. Numerous polystomatic salivary gland lobules and openings appear across the palate, lingual root, and laryngeal mound. Scanning electron microscopy demonstrates the arrangement of varied papillae, illustrating the structural adaptations of the oropharynx during feeding.
Understanding avian oral anatomy provides insights into how physical structures correspond to feeding behaviours and dietary habits. Detailed descriptions of the tongue, palate, and salivary structures in hooded crows expand comparative anatomical records. This knowledge aids zoologists and veterinary anatomists in mapping evolutionary adaptations across wild bird species and understanding normal cranial physiology.
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The present study was carried out on the oropharyngeal cavity of the hooded crow to investigate the gross and microscopic structures via gross anatomy, light microscopy and scanning electron microscopy (SEM). The gross anatomy clarified the elongated triangular shape of the oropharyngeal cavity with a non-protruding tongue with a bifid apex. The lingual body contained median groove rostrally and separated caudally from the root by a transverse papillary crest. The laryngeal mound located posterior to the lingual root, contained midline laryngeal cleft and bounded caudally by a transverse row of pharyngeal papillae. The palate contained choanal cleft rostrally and infundibular slit caudally in addition to five palatine ridges. By light microscopy, the dorsal lingual epithelium was highly keratinised stratified squamous with a lingual nail in the most rostral part of the apex. Then, the thickness of the keratin layer decreased caudally, while in the ventral surface, the lining epithelium became non-keratinised. The entoglossum supported the lingual body and root, but not extended to the apex. The lining epithelium of the palate was also keratinised stratified squamous and became none-keratinised at the oral side of the choanal cleft. There were numerous lobules of polystomatic salivary glands in the lingual root and the palate. SEM revealed the arrangement of different types of papillae covering both the floor and the roof of the oropharynx besides numerous openings of salivary glands in the lingual root, laryngeal mound and the palate. These findings reflect the functional relationship of the oropharyngeal cavity of the hooded crow during feeding.
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DOI: 10.1111/ahe.12602
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