choana

plural choanae

1. A funnel; a funnel-shaped opening.

   Near-synonyms: infundibulum, pelvis, cornu

   Synonyms: infundibulum, pelvis, cornu

2. anatomyA pair of apertures towards the back of the nasal cavity, opening into the nasopharynx.

   The choanal glands of caecilians open at the margin of the choanae, whereas those of salamanders open deep within the choanae at the margin of the olfactory epithelium.

   1986, William E. Duellman, Biology of Amphibians, page 409

   3 more examples

   Zuckerkandl (1893) gives far and away the greatest measurements for the choanae; Hopmann (1895) reported that in man the choana has a mean height of 27 mm, and a mean width of 13 mm (Merkel, 1896); in women it measures 25 x 12mm. These values agree closely with our findings.

   1989, Johannes Lang, translated by P. M. Stell, Clinical Anatomy of the Nose, Nasal Cavity and Paranasal Sinuses, page 103

   Inside of this area it is possible to identify clearly two parallel echonegative zones, which belong to the nasal cavities (choanas) and are placed on both sides of a medial structure, considerably echogenic, which corresponds to nasal bridge (Fig. 2.12.)

   2006, José María Carrera, Asim Kurjak, Donald School: Atlas of Clinical Application of Ultrasound in Obstetrics and Gynecology, India: Jaypee Brothers, page 14

   The bony rim of the posterior choana is located by passing the 4-mm microdebrider blade through the posterior ethmoids and into the nasopharynx. The tip of the microdebrider blade is pushed against the mucosa just above the bony choanae on the anterior face of the sphenoid.

   2008, Peter-John Wormald, Endoscopic Sinus Surgery, 2nd edition, page 111

   Synonyms: internal nostril, posterior naris, posterior nasal aperture