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|Mouth (oral cavity)|
It forms a partition between the nasal passages and the mouth. Also on the anterior portion of the roof of the hard palate is the Rugae which are the irregular ridges in the mucous membrane that help facilitate the movement of food backwards towards the pharynx. This partition is continued deeper into the mouth by a fleshy extension called the soft palate.
The hard palate is important for feeding and speech. Mammals with a defective hard palate may die shortly after birth due to inability to suckle (see Cleft below). It is also involved in mastication in many species. The interaction between the tongue and the hard palate is essential in the formation of certain speech sounds, notably /t/, /d/, /j/, and /ɟ/.
In the birth defect called cleft palate, the left and right portions of this plate are not joined, forming a gap between the mouth and nasal passage (a related defect affecting the face is cleft lip).
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