Tongue
Papillae
| Papilla Type | Shape & Features | Location on Tongue | Taste Buds Presence | Additional Clinical/Histological Notes | High-Yield MCQ Triggers |
| Fungiform Papillae | Dome-shaped (mushroom-like); appears bright red due to highly vascular core. | Scattered across the anterior 2/3, with highest concentration at the tip. | Yes (Located on the superior/top surface) | Covered by thin, non-keratinized epithelium which allows the red color of blood vessels to show through. | * Look like "red spots" clinically. * Known as transitional papillae. * Innervated by the Chorda Tympani (CN VII) for taste. |
| Filiform Papillae | Conical, slender, and spine-like; heavily keratinized giving the tongue a grayish/velvety look. | Covered extensively over the entire anterior 2/3 of the dorsum. | No | Purely mechanical function (provides friction to move food). Hypertrophy leads to "hairy tongue." | * "Purely mechanical" friction to move food). * Only papillae without taste buds. * Responsible for "hairy tongue" condition when keratin overgrows. |
| Circumvallate Papillae | Large, dome-like structures surrounded by a deep circular trench/moat. | 8 to 12 papillae arranged in a V-shaped row just anterior to the sulcus terminalis (posterior 1/3 boundary). | Yes (Located on the lateral walls/trench sides) | Serous von Ebner's glands empty into the trenches to wash away food particles so taste buds can register new flavors. | * Von Ebner's glands flush the trenches to refresh taste receptors (tested constantly!). * Innervated by CN IX (Glossopharyngeal) despite being anterior to the sulcus terminalis. |
| Foliate Papillae | Leaf-like parallel folds or ridges. | Located on the lateral margins of the posterior tongue. | Yes (Located on the lateral walls of the folds) | Well-developed in children, but often degenerate and become rudimentary in adults. | * Often mistaken by patients or novice clinicians for oral malignancies (frequent clinical MCQ trap!). |
| Lingual Papillae | N/A | N/A | N/A | This is simply the collective, general medical term for all epithelial elevations on the tongue; it is not a specific type. |