The Mandible

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Questions and Answers

What is the primary shape of the mandible?

  • Oval
  • Straight
  • Circular
  • Horseshoe (correct)

Which part of the mandible is responsible for the attachment of muscles of mastication?

  • Ramus (correct)
  • Alveolar process
  • Coronoid process
  • Body

What type of joint does the mandible articulate with the temporal bone?

  • Immovable joint
  • Movable synovial joint (correct)
  • Cartilaginous joint
  • Fibrous joint

What is the largest and strongest bone of the face?

<p>Mandible (C)</p> Signup and view all the answers

How is the body of the mandible characterized in terms of its structure?

<p>It is horizontal and U-shaped (D)</p> Signup and view all the answers

Which process of the mandible is sharp and beak-like in appearance?

<p>Coronoid process (A)</p> Signup and view all the answers

What structure does the head of the condyle articulate with?

<p>Mandibular fossa of the temporal bone (D)</p> Signup and view all the answers

What connects the mandibular teeth to the maxillary teeth?

<p>Alveolar process (A)</p> Signup and view all the answers

Which of the following statements about the ramus of the mandible is true?

<p>The ramus connects the body of the mandible to the skull. (B)</p> Signup and view all the answers

What type of bone structure is the mandible classified as?

<p>Single bone (C)</p> Signup and view all the answers

What is housed by the alveolar process of the mandible?

<p>8 teeth on each side (D)</p> Signup and view all the answers

Which plate forms part of the alveolar process of the mandible?

<p>Lingual plate (B)</p> Signup and view all the answers

Where is the mental foramen located?

<p>Inferior border at the region of the second premolar (C)</p> Signup and view all the answers

What feature originates at the mental tubercle?

<p>External oblique ridge (A)</p> Signup and view all the answers

Which part of the condyle supports the head?

<p>Neck (D)</p> Signup and view all the answers

What does the external oblique ridge become?

<p>Anterior border of the vertical ramus (A)</p> Signup and view all the answers

What is the mental protuberance also known as?

<p>Chin (D)</p> Signup and view all the answers

What muscle originates from the upper aspect of the mental spine?

<p>Genioglossus (A)</p> Signup and view all the answers

What feature of the mandible is referred to as the site of the submandibular salivary gland?

<p>Submandibular fossa (D)</p> Signup and view all the answers

Which of the following features reflects the bony origin of the anterior belly of the digastric muscle?

<p>Digastric fossae (A)</p> Signup and view all the answers

How many separate spines can the mental spine have?

<p>Up to 4 (C)</p> Signup and view all the answers

Which muscle attaches to the mylohyoid ridge?

<p>Mylohyoid (C)</p> Signup and view all the answers

What does the sublingual fossa house?

<p>Sublingual salivary gland (C)</p> Signup and view all the answers

What are mental tubercles?

<p>Small elevations beside the mental protuberance (C)</p> Signup and view all the answers

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Study Notes

The Mandible

  • The mandible is the lower jaw, a single bone
  • It is the largest and strongest bone of the face
  • The mandible is horseshoe-shaped, composed of a body with two rami (one on each side) - it articulates with the skull at the temporomandibular joint
  • This joint allows for the movement of the jaw and helps with chewing
  • The mandible offers attachment points for muscles like those involved in chewing.

Anatomy of the Mandible

  • Body: The horizontal portion, forming the U-shaped bone.
  • Ramus: The vertical portion extending upwards from the body.
  • Alveolar Process: Houses the teeth, composed of two plates (facial and lingual) connected by bony septa.
  • Condyle: The roller-shaped head that articulates with the temporal bone's mandibular fossa.
  • Neck: The bar of bone below the condyle.
  • Coronoid Process: Sharp, beak-like process anterior to the condyle, serving as the insertion point for the temporalis muscle.

External Features of the Mandible

  • External Oblique Ridge: Runs from the mental tubercle upwards and backwards, forms the anterior border of the vertical ramus (a ridge of bone).
  • Mental Foramen: Located near the second premolar, midpoint of the inferior border and the alveolar crest, allows passage for the mental nerve and artery.
  • Mental Protuberance (Chin): Triangular elevation of bone.
  • Mental Tubercles: Small elevations on either side of the mental protuberance..

Internal Features of the Mandible

  • Digastric Fossa: Small depressions on either side of the midline, reflecting the origins of the digastric muscle.
  • Mental Spine/Genial Tubercles: Up to 4 separate spines or a single fused spine, the upper aspect is the origin of the genioglossus muscle and the lower aspect is the origin of the geniohyoid muscle.
  • Mylohyoid Ridge: The origin of the mylohyoid muscle, which forms the floor of the mouth's anterior part.
  • Submandibular Fossa: Located at the internal surface, houses the submandibular salivary gland.
  • Sublingual Fossa: Located at the internal surface, houses the sublingual salivary gland.

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