(biochemistry) a long linear polymer of nucleotides found in the nucleus but mainly in the cytoplasm of a cell where it is associated with microsomes; it transmits genetic information from DNA to the cytoplasm and controls certain chemical processes in the cell. see more on Definitions.net Â».
It forms a partition between the nasal passages and the mouth. On the anterior portion of the roof of the hard palate are the rugae, 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.he hard palate is a thin horizontal bony plate of the skull, located in the roof of the mouth.
The tongue is a highly manipulative, muscular structure used to aid ingestion, with an attachment deep in the throat. Palates. The hard palate makes up the anterior part of the roof of the mouth. Made of bone and covered with folds of mucus membrane, the hard palate separates the oral cavity from the nasal cavities. The surface of the soft palate is a posterior continuation of the mucous membrane, but it contains no bone. Unerupted teeth. Visible here are the beginning of the pig's tusks and the unerupted teeth. Pharynx. The pharynx is the region encompassing the base of the tongue and the junction of the passageways for food (esophagus) and air (trachea). Note the epiglottis (small flap of tissue at rear of pharynx) visible in this picture.