Definitions

palate

palate

[pal-it]
palate, roof of the mouth. The front part, known as the hard palate, formed by the upper maxillary bones and the palatine bones, separates the mouth from the nasal cavity. It is composed of a bone plate covered with a layer of mucous membrane tissue. The back portion, or soft palate, consists of muscular tissue and mucous membrane forming a partial partition between the mouth and the throat. A small conelike projection, the uvula, hangs from the middle of the soft palate in humans. The soft palate and uvula move upward during swallowing or sucking, preventing food from entering the nasopharynx. In mammals other than humans, the soft palate overlaps the larynx during swallowing so as to prevent entry of foreign substances into the respiratory tract. Both the hard and soft portions of the palate are lined with mucous membrane containing numerous glands that lubricate the mouth and throat. If the sides of the bony palate fail to come together during embryonic development an opening, or cleft, remains along the midline. This condition, known as cleft palate, can be repaired surgically in early infancy. See digestive system.

Roof of the mouth, separating the oral and nasal cavities. The front two-thirds, the hard palate, is a plate of bone covered by mucous membrane. It gives the tongue a surface against which to make speech sounds and shape food during chewing and keeps pressures in the mouth from closing off the nasal passage. The flexible soft palate behind it is made of muscle and connective tissue and ends in the uvula, a fleshy projection. It rises to block the nasal cavity (see nose) and upper pharynx off from the mouth and lower pharynx for swallowing or to create a vacuum for drinking. Cleft palate, a congenital disorder involving a gap in the palate, can be corrected surgically.

Learn more about palate with a free trial on Britannica.com.

Fairly common congenital disorder in which a fissure forms in the roof of the mouth. It may affect only the soft palate or extend through the hard palate, so that the nasal cavity opens into the mouth. The septum (dividing wall) between the nostrils is often absent. Cleft lip, a fissure in the lip beneath the nostril, or other abnormalities may accompany it. Cleft palate limits the ability of an infant to suck, which may lead to malnutrition, and causes speech problems in childhood. Surgical repair, usually at about 18 months of age, forms an airtight separation between nose and mouth. Speech training is still needed, and patients may have a high risk of nose, ear, and sinus infections.

Learn more about cleft palate with a free trial on Britannica.com.

The palate is the roof of the mouth in humans and vertebrate animals. It separates the oral cavity from the nasal cavity. The palate is divided into two parts, the anterior bony hard palate, and the posterior fleshy soft palate or velum. The maxillary nerve branch of the trigeminal nerve (V) supplies sensory innervation to the palate.

Etymology

The name is Middle English and is probably derived from the Latin palatum or the Old French palat.

Function

When functioning in conjunction with other parts of the mouth the palate produces certain sounds, particularly velar, palatal, palatalized, postalveolar, alveolo-palatal, and uvular consonants.

Search another word or see Palateon Dictionary | Thesaurus |Spanish
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature