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In jawed vertebrates, the mandible (from the Latin mandibula, 'for chewing'), lower jaw, or jawbone is a bone that makes up the lower – and typically more mobile – component of the mouth (the upper jaw being known as the maxilla). The jawbone is the skull's only movable, posable bone, sharing joints with the cranium's temporal bones.
In the ape, there is a reinforcement to the lower jaw bone called the simian shelf. In the evolution of the mammalian jaw, two of the bones of the jaw structure (the articular bone of the lower jaw, and quadrate) were reduced in size and incorporated into the ear, while many others have been fused together. [3]
The enamel of teeth is formed from ectoderm (the precursor germ layer to skin and mucosa), and so remnants of epithelium can be left in the bone during odontogenesis (tooth development). The bones of the jaws develop from embryologic processes which fuse, and ectodermal tissue may be trapped along the lines of this fusion. [ 1 ]
A jaw abnormality is a disorder in the formation, shape and/or size of the jaw. In general abnormalities arise within the jaw when there is a disturbance or fault in the fusion of the mandibular processes. The mandible in particular has the most differential typical growth anomalies than any other bone in the human skeleton.
Six students were taking an intensive workshop at the center last summer, and together they came up with a lead that the bone belonged to Yager. One of the people assisting, Ethan Schwartz, was an ...
The facial skeleton comprises the facial bones that may attach to build a portion of the skull. [1] The remainder of the skull is the neurocranium.. In human anatomy and development, the facial skeleton is sometimes called the membranous viscerocranium, which comprises the mandible and dermatocranial elements that are not part of the braincase.
After all, a strong jawline and lifted brown bone is flattering at every angle. What Is An Ultherapy Procedure Like? The procedure can range anywhere from my 20-minute flash treatment to more than ...
In the case of mandibular prognathism (never maxillary prognathism) this is often also referred to as Habsburg chin, Habsburg's chin, Habsburg jaw or Habsburg's jaw [2] [3] especially when referenced with context of its prevalence amongst historical members of the House of Habsburg.