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Since the mandible can go through a vast number of different movement paths, Posselt decided to start by studying the "border movements", a term he uses to denote the mandible's capacity for movement. Then he compared these with the habitual movements of the mandible. From the investigation, he concluded that:
For example, the sella (S) and the nasion (N) are points that together form the sella-nasion line (SN or S-N), which can be projected into the SN plane. A prime symbol ( ′ ) usually indicates the point on the skin's surface that corresponds to a given bony landmark (for example, nasion (N) versus skin nasion (N ′ ).
The term submaxillary may be confusing to modern students and clinicians since these spaces are located below the mandible, but historically the maxilla and mandible together were termed "maxillae", and sometimes the mandible was termed the "inferior maxilla". Sometimes the term submaxillary space is used synonymously with submandibular space. [4]
Odontogenic infections which erode through the buccal cortical plate of the mandible or maxilla will either spread into the buccal vestibule (sulcus) and drain intra-orally, or into the buccal space, depending upon the level of the perforation in relation to the attachment of buccinator to the maxilla above and the mandible below (see diagrams).
In human anatomy, the facial skeleton of the skull the external surface of the mandible is marked in the median line by a faint ridge, indicating the mandibular symphysis (Latin: symphysis menti) or line of junction where the two lateral halves of the mandible typically fuse in the first year of life (6–9 months after birth). [1]
The mylohyoid line is a bony ridge on the internal surface of the body of the mandible. The mylohyoid line extends posterosuperiorly. The mylohyoid line continues as the mylohyoid groove on the internal surface of the ramus. The mylohyoid muscle originates from the anterior (front) part of the mylohyoid line. [1]
The dorsal end of each cartilage is connected with the ear-capsule and is ossified to form the malleus; the ventral ends meet each other in the region of the mandibular symphysis, and are usually regarded as undergoing ossification to form that portion of the mandible which contains the incisor teeth.
In head and neck cancer, Ohngren's line is a line that connects the medial canthus of the eye to the angle of the mandible. [1]The line defines a plane orthogonal to a sagittal plane that divides the maxillary sinus into (1) an anterior-inferior part, and (2) a superior-posterior part.