Covers the boundaries of the oral region, then the oral vestibule: the lips with their muscle, nerves, vessels and glands, and the cheeks with their layers and buccinator muscle. It also lists the internal borders and the structures found within the vestibule, such as the parotid duct opening, the labial frenula, the maxillary tuberosity and the fornix, with accompanying pictures.
Topic 215 of 264 in the MU Sofia syllabus for Anatomy (Dental Medicine, Year 2). The free AceMed note covers it in 2 sections, about 133 words (1 min of reading), with 10 flashcards.
In this note
ORAL REGION
Boundaries :
Boundaries :
Sup. : horizontal line passing through the lowest point of the nasal septum
Inf.: Mentolabial sulcus.
lat. : Nasolabial sulcus.
2. Oral cavity Proper
Parts :
1. The oral vestibule :
External borders :
lips : 2 fleshy folds surrounding the oral orifice; they accommodate orbicularis oris muscle; they contain nerves, vessels & glands.
Sensory inner: by branches of infraorbital n. & mental n.
cheeks : they are continuous with lips at nasolabial grooves.
Their muscle is buccinator
Internally they are lined by mucos membrane.
Externally they are covered by skin, buccal pad of fat, and buccopharyngeal fascia
Internal borders :
Teeth
Gums
The vestibule contains the following:
1. Opening of the parotid duct.
2. Superior labia frenulum
connect sup. lip to the gum
3. Inferior labia frenulum.
4. Maxillary tuberosity
5. Fornix
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