The internal and septal ducts appear to be confined to the species of warm-temperate or tropical countries.
The septal duct is peculiar to a few species (oocarpa, tropicalis, and less frequently Pringlei and Merkusii).
A strip of septal cartilage is always left above, beneath the crest of the nose.
Its anterior end always remains unossified, and forms the septal cartilage of the nose.
In the worst forms of stenosis from septal deformity they are useless.
In the majority of Nautiloids the septal necks are directed backwards, and they are said to be retrosiphonate.
For a time there was enthusiastic cutting of septal spurs and burning of redundant mucosa and cauterizing of sensitive areas.
In transverse section it is crescentic, since the septal wall bulges into its cavity.
These cusps are spoken of as septal, marginal and infundibular, from their position.
Causes originating in the septum include deviations, spines, and ridges, and septal hæmatoma and abscess.
septal sep·tal (sěp'təl)
Of or relating to a septum or septa.