Oral Cavity (Cavum Oris)

29Jun07

Walls of oral cavity

1. Lower wall (diaphragm cavi ores) : m.mylohyoideus
2. Upper wall : Hard & Soft Palate
3. Side wall : Cheeks
4. Front wall : Lips

Sections

1. Front section (vestibulum oris) : between cheek & lips, and teeth.
2. Proper oral cavity (cavitas oris propria)

Gingivae (gums)

• Formed by
  • Alveolar process of maxilla
  • Alveolar part of mandibula
• Covered by mucosa

Vestibulum oris & cavitas oris propria is communicated by a narrow fissure (oral fissure) between upper & lower teeth.

Oral fissure (inlet into vestibule) is between upper & lower lips, and connected by commisura labiorum.

Lips – formed by m.orbicularis oris.

Cheeks (buccae) – formed by m.buccinalis.

Between muscle & skin, lies the accumulation/lumps of adipose tissue known as Bishe’s Lump. It is best developed in infant – the lump thickens the wall of oral cavity, lowering influence of atmosphere thus easing the act of sucking.

Palate

• Hard Palate
  • Formed by – processus palatini maxillae and lamina horizontalis ossis palatini.
• Soft Palate
  • Attached to posterior edge of hard palate.
  • Formed by – connective tissue lamina, covered by mucosa.
  • Anterior end lies horizontally.
  • Posterior end hangs down, forming palatine velum.
  • Middle part – hangs a small rounded process called uvula (anak tekak)
  • Beginning of lateral edge, there are 2 mucosal arch:
    • Palatopharyngeal – forms the lateral wall of pharynx.
    • Palatoglossa – forms the lateral edge of the root of tongue.
    • Within these, there are tonsillar fossa where lies palatine tonsil – responsible for immunology.

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