Bone of ventral nasal concha

The bone of the ventral concha (Concha nasalis ventralis) is also called 'maxillo-turbinal' or 'maxillary concha' because its main sheet is inserted on a longitudinal crest of the maxillary: the conchal crest.

Its disposition varies much. Basically, two types can be distinguished: a wraped-type that, among the domestic Mammals, appears in Ungulates and a branchy-type, in Carnivorous and Glires.

In Ruminants and Pigs, the main sheet splits medially into two secondary sheets, a dorsal one and a ventral one, wraped in opposite directions; each delimits a a cavity opened in the corresponding meatusand subdivided in small compartments as the one of the dorsal concha.

In Equidae, the ventral concha only has one sheet, wraped dorsally and its cavity opens in the middle meatus. Besides, a vast compartment isolates itself at its caudal  part and takes part in the constitution of the rostral maxillary sinus: it is a ventral conchal sinus (Sinus conchae ventralis), that exists at a distinct state in Ruminants and Pigs.

The branchy conchae are in general very voluminous and nearly obstruct the nasal cavity. They also include a proper wraped sheet, but this one has several secondary longitudinal sheets on its convex surface of which each presents in its turn a proper wrapping and can hold tertiary sheets.