Prenatal Development of the Nasal Conchae (Conchae nasales) in Rabbits (Oryctolagus cuniculus)

Abstract

Nasal conchae increase the surface area of these cavities, thus providing for rapid warming and humidification of air and by regulating nasal airflow, play a role in immune surveillance because they are the first intranasal structures to come into contact with outside air. The present study aimed to depict the onset time of the first appearance and origin as well as developmental changes of Nasal conchae.Prenatal development of the rabbit nasal conchae. ALomaisi nasal cavity showed nerve bundles extended from the covering epithelium toward the olfactory bulb. At Day 22: The core of fold contained the cartilaginous extension of ventral nasal conchae was clear. The cells of the olfactory mucous membrane were differentiated and the shape of the nuclei of its cells was tapered in the basal cell layer or rounded or oval in the intermediate layers. At Day 25: The ethmoidal conchae had primary and secondary branches housing in between ethmoidal meatuses. The top of the ethmoidal conchae was capped by olfactory epithelium

Morphogenesis and computed tomographic study on maxillary and ethmoidal conchae as well as their related nasal sinuses in New Zealand White rabbits: prenatal and postnatal development

“…When the rabbit embryo was 14 days old, the primordial middle meatus divided the epithelium into the anlage of the dorsal and ventral nasal conchae [10] and added that, Primary and secondary branches of the ethmoidal conchae housed in between the ethmoidal meatuses. The olfactory epithelium capped the top of the ethmoidal cone at the age of 28 days of rabbit fetus at caudal part of nasal cavity.…”

“…As the ventral has evolved from two origins, the maxilla and the lateral cartilaginous capsule, the dorsal and ventral turbinate have formed and ossi ed from the ethmoid bone. Turning over the mucosa, it seems that the turbinate develops rst and the ossi cation happens later, [10].…”

“…Numerous folds that would eventually create the ethmoidal conchae were seen in the caudo-dorsal region of the developing nasal cavity covering by olfactory epithelium and divide into primary & secondary branches in between them there are ethmoidal meatuses [10].The term of the sinuses comes from the facial bone; the ethmoid-turbinate projection creates the ethmoidal air cells called ethmoidal sinuses and the inferior or maxillo-turbinate projection forms the inferior turbinate and maxillary sinus and both are arise at birth [13]. The paranasal sinuses of rabbit were the dorsal conchae, maxillary and ethmoidal sinuses with absence of frontal and sphenoidal [14].…”

“…The special function of that nasal conchae or turbinate is very important not only for redirecting the inspired air into nasal passage and increase of surface area of moisting, purring and trapping of dust particles [10] but also olfaction through its olfactory epithelium so it is one immune response of nasal cavity [11], that is also same function of nasal cavity [12] who added that, anatomical structures and their spatial relationships is critical for diagnosis and treatment planning of the cavum nasi.…”