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HISTOLOGY OF THE TONGUEHISTOLOGY OF THE TONGUE

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UpperSurface

Divided into 2main zone : Anterior 2/3

Posterior 1/3

Separated by V-shaped line(sulus

terminalis! o"#-1$ dome shapeprotrusions

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%he sur"ae epithelium o"anterior 2/3 o" the ton&ue  raised in series o" elevation  papillae

3 types papillae : 'ili"orm papillae 'un&i"orm papillae

irumvallate papillae  lined onV-shaped line

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'ili"orm papillae

%he smallest) mostnumerous in humans

'ound all over theupper sur"ae o" 2/3

anterior part %all) narro*)+eratinized

,o taste buds) serve

only mehanial role

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Circumvallatepapillae 0ar&e) dome-shape

strutures on thesulus terminalis

Surrounded by le"t

ontains numeroustaste buds

,umerous primary .seondary papillae

von bners &landempty their seretioninto the base o" thele"t

%he seretion "lushesthe material "rom thele"t to enable thetaste buds to respondrapidly in han&in&stimuli

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Foliate papillae ,umerous in animals

0ateral ed&e o" theton&ue

n youn&er  "ound onthe post-lateralsur"ae

n elderly  obliterate

%aste uds 44

Primary papillae  lon& . lar&e

Seondary papillaer  very hi&h

Small serous &landempty into the le"t

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Taste

u!s Sensor" receptor for

taste Onion#li$e s%ape Occupies t%e

fullt%ic$ness ofepit%elium

Small opening onto

epit%elial surfacetaste pore & principal cell t"pes

neuroepit%elial 'sensor"(cells) supporting cells)*asal cells

Sensor" cells mostnumerous cells) turnoevertime +, !a"s

Supporting cells lessnumerous) !o not sinapse-it% t%e nerve cells

asal cells *asal

portion) stem cells fort%e . ot%er cells t"pe

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%aste is haraterized as hemial sensation

 substane ontained in "ood interat *ithtaste reeptors

5eat to 6 basi stimuli s*eet) salty)bitter) sour . 7umami8

9mami  taste o" ertain amino aids (e&

&lutamate) aspartate!

S*eet stimuli  tip o" the ton&ue

Salty stimuli  posterolateral to the tip

Sour stimuli  more posterolateral to the tip

itter . umami stimuli  irumvallatepapillae

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S+eletal musle is arran&ed in many diretionslon&itudinallyvertiallytransverselyobli;uely

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Posterior 1/3 o" the ton&ue = 5oot o" the ton&ue

,o papillae

overed by non-+eratinizin&strati"ied s;uamous epithelium

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