The oral vestibule is the slit-like space between the lips and cheeks on the outside and the teeth and gums on the inside. With the teeth together it still connects with the main mouth cavity behind the last molars.
| Location | Between the lips and cheeks externally and the teeth and gingivae internally |
|---|---|
| Parts |
|
| Nerve Supply | Infraorbital, mental and buccal nerves (sensation); Facial nerve (lip and cheek muscles) |
| Blood Supply | Superior and inferior labial arteries; Buccal artery; Superior alveolar arteries |
| Venous drainage | |
| Lymphatic drainage |
|
Holds food against the teeth during chewing with help from the buccinator and receives saliva from the parotid duct.
Dental local anaesthetic is often injected into the vestibule mucosa. Mouth ulcers, cheek biting and oral cancers of the buccal mucosa occur here, and dental abscesses can point into the vestibule as a gum boil.
Painful shallow ulcers of the lining of the lips and cheeks.
Pus from an infected tooth draining through the bone into the sulcus beside the tooth.
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