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{{Infobox anatomy | Name = Mandible | Latin = Mandibula | Image = | Caption = Lateral view of the mandible highlighting the ramus, body, and alveolar process. | System = [[Skeletal system]] | Articulation = [[Temporal bone]] (at the TMJ) | Nerve = [[Inferior alveolar nerve]], [[Mental nerve]], [[Lingual nerve]] }} ==Definition== The '''mandible''' is the horseshoe-shaped bone that forms the lower jaw and holds the lower [[teeth]]. It consists of a horizontal portion, the '''body''', and two vertical portions, the '''rami''' (singular: ramus), which articulate with the [[temporal bone]] to form the [[temporomandibular joint]] (TMJ). Unlike the [[maxilla]], which is fused to the skull, the mandible is a movable structure essential for [[mastication]], [[speech]], and facial expression. ==Anatomical Features== ===1. The Body of the Mandible=== The horizontal part of the bone that supports the lower dentition. * '''[[Alveolar process]]''': The superior margin containing the sockets for the mandibular teeth. * '''Mental Foramen''': An opening typically located below the second [[premolar]] that transmits the [[mental nerve]] and vessels. * '''Mental Protuberance''': The bony prominence forming the chin. * '''Mylohyoid Line''': A ridge on the internal surface where the [[mylohyoid muscle]] attaches, forming the floor of the mouth. ===2. The Ramus=== The vertical part of the mandible that extends upward. * '''[[Condylar process]]''': The posterior projection that articulates with the glenoid fossa of the temporal bone. * '''[[Coronoid process]]''': The anterior projection that serves as the attachment point for the [[temporalis muscle]]. * '''Mandibular Notch''': The depression between the condylar and coronoid processes. * '''Mandibular Foramen''': Located on the internal (medial) surface of the ramus; it is the entry point for the [[inferior alveolar nerve]]. ===3. The Angle of the Mandible=== The junction where the inferior border of the body meets the posterior border of the ramus. It is a major attachment site for the [[masseter muscle]] and [[medial pterygoid muscle]]. ==Clinical Significance== ===Local Anesthesia=== The '''[[Inferior Alveolar Nerve Block]] (IANB)''' is the most common anesthetic
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