Jaw

It is an odd bone that contains the lower dental arch. It consists of a horizontal portion, the body, and two perpendicular portions, the branches, which join the body at an almost right angle.

Body

Outer Face

Mentonian Lump & #8211; triangular eminence

Mentonian Symphysis (Anthropometric Point) & #8211; soft crest on the midline

Mentonian foramen & #8211; depression on either side of the symphysis. Vessel and mentonian nerve passage

External Oblique Line

Inner Face

Mentonian Spine & #8211; pair of pimples near the symphysis

Digastric Fossa & #8211; just below the mental spines

Sublingual Fossa & #8211; above the milohyoid line

Submandibular Fossa & #8211; below the milohyoid line

Myohyoid Line (Internal Oblique) & #8211; next to the symphysis and heads back

Borders

Superior or Alveolar & #8211; receives the sixteen teeth of the lower dental arch

Bottom

Branches

They have two faces, four edges and two processes:

Side Face & #8211; features oblique ridges for masseter muscle insertion

Medial Face & #8211; presents the following structures:

Mandibular foramen & #8211; passage of inferior alveolar vessels and nerve

Myohyoid Groove

Jaw Tongue & #8211; prominent ridge above the milohyoid groove

Lower Edge & #8211; lies the angle of the jaw

Back Edge & #8211; is covered by the parotid gland

Anterior Edge & #8211; continues with the oblique line

Top Edge & #8211; has two very important processes: Process Coronoid and Condylar process (articulates with the articular disc of the temporomandibular joint & #8211; TMJ). Between these two processes we find the jaw notch.

THE Jaw hinges with two bones: Temporal (2).

JAW & #8211; PREVIOUS VIEW