Tongue
Why this matters
The tongue is the structure a dentist looks at, works around and injures most often. In Western registry series the oral tongue is the commonest oral cavity subsite and its lateral border is the commonest part of it; in South and Southeast Asian betel-quid populations buccal mucosa predominates instead, so site ranking is a statement about a named population, never a universal fact. Its lingual nerve is the nerve most often damaged by third molar surgery and by an inferior alveolar block; the floor of mouth beneath it can bleed into the airway after anterior mandibular surgery.
The big picture
One organ, built from two different embryological territories wrapped around muscle that migrated in from somites. That mismatch is why FIVE cranial nerves supply one tongue, why the boundary between the two territories is a visible groove, and why the same region divides two different cancers.
One groove, five nerves, four papillae, three of which taste.
The 15 cards in this lesson
- 01Two ways to divide one tongue
- 02The dorsum: one plate, the whole surface story
- 03The foramen cecum and the journey it records
- 04The four papillae and which of them taste
- 05Two things everyone gets wrong about papillae and taste
- 06Four intrinsic fibre directions, one interwoven lattice
- 07The four extrinsic muscles
- 08Five nerves, one tongue — and why
- 09Clinical alert — in the lesson
- 10The lingual nerve: no canal, no safe zone
- 11Blood supply, and the vein you can see
- 12Clinical alert — in the lesson
- 13Clinical alert — in the lesson
- 14The frenulum: a fold in a sheet, not a cord
- 15Clinical alert — in the lesson
You have got it when
You can place the sulcus terminalis and say what changes across it — mucosa, nerve, arch of origin, and cancer staging system; name the four papilla types and which three carry taste buds; name the five cranial nerves that supply one tongue; explain why a lower motor neuron hypoglossal lesion deviates the tongue toward the lesion; and say which tongue findings go on a suspected-cancer pathway and which are same-day…
36 references, graded by tier: 4 tier-1 · 2 tier-2 · 1 tier-3 · 29 tier-4 · sources last checked 2026-08-06
The full lesson entry includes
- All 15 teaching cards, each opening at Quick and expanding into Learn and Deep
- 5 final-challenge questions with worked rationales, and a micro-check on every card
- The 10-prompt recall deck, scheduled today, +1, +3, +7 and +21 days
- The misconceptions students actually hold, each with its correction
- All 36 references, tiered and annotated
More preclinical curriculum
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