Unit 4 - Tongue

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Dorsum

surface of the tongue
Major regions of the tongue
- tip
- blade
- front
- back
Median sulcus
- divides the dorsum in half
- running from front to back and ends at foramen cecum
Sulci terminalis (2)
- Running diagnoally from foramen cecum
- Antero-lateral direction
- Separate tongue into anterior 2/3 and posterior 1/3
Papillae
- Taste buds
- Located in the posterior third
Lingual frenum

anchors the tongue to the floor of the mouth
Superior longitudinal muscle
- Unpaired, near the surface
- Runs back to front
- Shorten the tongue and slightly raise the tongue tip
Inferior longitudinal
- unpaired, under surface of the tongue from back to front
- can shorten the tongue and slightly lower the tongue tip
Transverse
- From medial sulcus to lateral edges if the tongue
- Narrows and elongates the tongue
Vertical
- Originate on surface and course downward toward under surface
- Contraction results in flattening of the tongue