Information AboutMouth |
| CATEGORIES ABOUT MOUTH | |
| mouth | |
| animal anatomymouth | |
| animal anatomy | |
| head and neck | |
| phonetics | |
| digestive system | |
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The mouth, also known as the '''buccal cavity''' or the '''oral cavity''', is the opening through which an Animal takes in Food and Water . It is usually located in the Head . The mouth of a Planarium is in the middle of its belly. Most animals have a complete Digestive System , with a mouth at one end and an Anus at the other. Which end forms first in Ontogeny is a criterion used to classify animals into Protostome and Deuterostome . Some animals, such as the Cnidarian s, the Brachiopod s, and the planaria, have no anus, and thus expel waste through the mouth. In many animals, the mouth has Mouthparts to chew food, hold food, or inject poison. In Arthropod s, they are external modified legs; in Gnathostome Vertebrates they are internal. The human mouth is covered by an upper and lower Lip . They play an important role in Speech (it is part of the Vocal Apparatus ), Facial Expression , Kiss ing, Drink ing (especially with a straw), and Smoking . Infant s are born with a Sucking reflex, by which they Instinct ively know to suck for nourishment using their lips and Jaw . Lips are often adorned with Lipstick or Lip Gloss . The ''' Philtrum ''' is the vertical groove in the upper lip, formed where the Nasomedial and Maxillary processes meet during Embryo Development . When these processes fail to fuse fully, a Hare Lip and/or Cleft Palate can result. The nasolabial folds are the deep creases of tissue that extend from the nose to the sides of the mouth. One of the first signs of age on the human face is the increase in prominence of the nasolabial folds. According to western Etiquette , the mouth is kept closed, especially when chewing. |
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