There may be recognized in the nose a base, which is directed downward, and a root, situated between the two orbits; the rounded anterior surface is directed forward and upward and is termed the dorsum, and it terminates in the tip of the nose, or apex nasi. The margins representing the lower borders of the base pass backward from the tip to form the alee, and they constitute the lateral boundaries of the nostrils (nares), which are separated from each other by the antero-inferior portion of the nasal septum, the membranous septum.
The oral cavity is the first portion of the entire digestive tract. It is an irregularly shaped, elongated cavity, situated in the lower portion of the face, and its boundaries are partly bony and partly musculocutaneous. It is divided by the two rows of teeth into two incompletely separated spaces, the vestibulum oris and the oral cavity proper.
The digestive apparatus includes the actual intestinal tract, taking those words in their widest sense, and according to its development this tract may be divided into four portions: The oral cavity; the foregut; the midgut; the hindgut.
Change is a fundamental characteristic of all living things. The human body during its life cycle accordingly passes through various phases of form and structure. In the earliest embryonic phases of development, the changes are very rapid, decreasing in rapidity during the later fetal stages, but continuing at a diminishing rate throughout infancy, childhood and youth up to the adult. Following the acme of maturity, changes continue which lead gradually to senescence and final death of the body.
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