Upload
hendri
View
231
Download
1
Embed Size (px)
Citation preview
8/17/2019 Histology of the Tongue
1/13
HISTOLOGY OF THE TONGUEHISTOLOGY OF THE TONGUE
8/17/2019 Histology of the Tongue
2/13
8/17/2019 Histology of the Tongue
3/13
UpperSurface
Divided into 2main zone : Anterior 2/3
Posterior 1/3
Separated by V-shaped line(sulus
terminalis! o"#-1$ dome shapeprotrusions
8/17/2019 Histology of the Tongue
4/13
%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
8/17/2019 Histology of the Tongue
5/13
'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
8/17/2019 Histology of the Tongue
6/13
8/17/2019 Histology of the Tongue
7/13
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
8/17/2019 Histology of the Tongue
8/13
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
8/17/2019 Histology of the Tongue
9/13
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
8/17/2019 Histology of the Tongue
10/13
%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
8/17/2019 Histology of the Tongue
11/13
S+eletal musle is arran&ed in many diretionslon&itudinallyvertiallytransverselyobli;uely
8/17/2019 Histology of the Tongue
12/13
Posterior 1/3 o" the ton&ue = 5oot o" the ton&ue
,o papillae
overed by non-+eratinizin&strati"ied s;uamous epithelium
8/17/2019 Histology of the Tongue
13/13