Oral Cavity (Cavum Oris)
Walls of oral cavity
- Lower wall (diaphragm cavi ores) : m.mylohyoideus
- Upper wall : Hard & Soft Palate
- Side wall : Cheeks
- Front wall : Lips
- Front section (vestibulum oris) : between cheek & lips, and teeth.
- Proper oral cavity (cavitas oris propria)
- 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.
- 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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