The correct spelling of the bone located in the upper part of the skull, commonly referred to as the "upper jawbone," is maxilla. The word is pronounced /mæk'sɪlə/ (mak-suh-luh), with the stress on the second syllable. The "x" in "maxilla" is pronounced as a "ks" cluster, and the final "a" is pronounced like the "a" in "comma." Proper spelling is important in biomedical fields as incorrect spelling can lead to errors in communication and can affect diagnosis and treatment.
The upper jawbone, also known as the maxilla, is a significant part of the facial skeleton and plays a crucial role in dental function, facial expression, and overall facial aesthetics. It is located in the upper region of the face, forming the framework of the upper mouth and supporting the teeth of the upper dental arch.
Anatomically, the upper jawbone consists of two maxillary bones that are fused together in the middle at the center of the face. It is a robust, horseshoe-shaped bone that articulates with various other cranial and facial bones, such as the nasal bones, lacrimal bones, palatine bones, and zygomatic bones. Together, these connections form the complex facial structure.
The primary function of the upper jawbone is to provide support and stability to the upper teeth, allowing efficient chewing and mastication. It also contributes to the formation of the nasal cavity and serves as a point of attachment for various facial muscles involved in facial movements, such as smiling and chewing.
In addition to its functional role, the upper jawbone greatly influences facial aesthetics, as it contributes to the appearance of the mid-face. Its shape and structure impact the projection of the nose, the contour of the cheeks, and even the overall harmony of the face.
Diseases or injuries to the upper jawbone can lead to a range of issues, including malocclusion (misalignment of the teeth), facial deformities, difficulty in chewing and speaking, and aesthetic concerns.
The word "upper" is derived from the Old English word "upp", which means higher or above. "Jawbone" comes from the combination of two Old English words: "jafn", meaning equal or even, and "ban", which translates to bone. Hence, the term "upper jawbone" refers to the bone structure located above the lower jawbone.