The oral cavity forms in the embryo from an in-pocketing of the skin, stomodeum; it is, thus, lined by ectoderm. Functionally, the mouth forms the first [...]
The anatomical structures that play a central role in the res piratory system are located in the head and neck as well as the thorax.
Nasal cavities are [...]
The respiratory system permits the exchange of oxygen and carbon dioxide between air and blood by providing a thin cellular membrane deep in the lung [...]