Tongue Flashcards
(37 cards)
how is the tongue divided?
anterior 2/3 and posterior 1/3 by sulcus terminalis
how is the sulcus terminalis shaped?
V-shaped depression - posteriorly pointing apex ends in a shallow pit
what is the shallow pit at the apex of the sulcus terminalis called
foramen cecum
the dorsal surface of the tongue is covered by what type of epithelium
stratified squamous parakeratinized to keratinized epithelium
ventral surface of tongue is covered with what epithelium
stratified squamous nonkeratinized epithelium
both ventral and dorsal surfaces of tongue have what in common
both have lamina propia and submucosa of dense irregular CT
what consistutes the bulk of lingual tissue
muscular core
where are lingual papillae located
located on dorsal surface of anterior 2/3 of tongue
what are the four types of lingual papillae
filiform papillae
fungiform
foliate
circumvallate
characteristics of filiform papillae
short, narrow, highly keratinized, pointed structures - project above the tongue surface
characteristics of fungiform papillae
mushroom-shaped, project above tongue surface. interspersed among filiform papilae. occasionally have taste buds
characteristics of foliate papillae
shallow, longitudinal furrows located on the tongue’s lateral aspect
characteristics of circumvallate papillae
large, circular - each one surrounded by a moat-like furrow. 10-15 in number distributed in a V pattern just anterior to sulcus terminalis
about how many spindle-shaped cells do taste buds have
60-80 cells
4 different cell types of taste buds
dark (type I) cell
light (type II) cell
intermediate (type III) cell
basal (type IV) cell
average life span of taste buds
10 days
how are the four different cell types of taste buds related?
basal cell > dark cells > light cells > intermediate cells > die
(key: > = gives rise to/becomes
taste buds specialize in how many tastes
each taste bud specializes in 2 of 4 tastes
how are salty & sour tastes identified?
due to specific ion channels in cells
how are bitter and sweet tastes identified?
specific membrane receptors ;
receptors called TAS2R - detects bitter substances
what is umami? how is it detected
a savory flavor, detects carboxylase ion on glutamic acid - monosodium glutamate
can you detect fat?
still being researched whether you can identify fat through taste buds
loss of taste is called
ageusia
partial loss of taste is called
dsgeusia
