Assistant Professor Anatomy KEMU Tongue is a muscular organ projecting into the oral cavity from its inferior side Organ of speech Organ of taste It helps in swallowing a nd plays a role in digestion ID: 914511
Download Presentation The PPT/PDF document "HISTOLOGY OF TONGUE By Dr. Sobia Ibrahim" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
HISTOLOGY OF TONGUE
By Dr. Sobia Ibrahim
Assistant Professor Anatomy,
KEMU
Slide2Tongue is a muscular organ projecting into the oral cavity from its inferior side
Organ of speech
Organ of tasteIt helps in swallowingand plays a role in digestion
Slide3Three subdivisions
Root/base
BodyTip
Slide4Tongue is basically a mass of striated
muscle
covered by mucous membraneLingual muscles are arranged in bundles that run in three
planes; longitudinal, transverse, vertical
Muscles fibers firmly adherent to
mucous membrane.
Between muscle fibers are gland
Mucous- at base
Serous- in body
Mixed- near tip
Slide5It has two surfaces
Dorsal (superior)
Ventral (inferior)Dorsal is roughened bcz of papillaeVentral is smooth Grossly dorsal surface is divided into anterior 2/3 and posterior 1/3 by sulcus terminalis
Slide6PAPILLAE
Mucosal irregularities and elevations in different forms and functions
Present anterior to sulcus terminalis on dorsum of tongueThese papillae and associated taste buds constitute the specialized mucosa of oral cavityFilliform Fungiform
Circumvallate
Foliate
Slide7Papillae of tongue
Slide8FILLIFORM PAPILLAE
Smallest and most numerous in humans
Conical
Heavily keratinized
Lacks taste buds
Distributed over entire anterior dorsal surface
Provides rough surface
Slide9FUNGIFORM PAPILLAE
Less numerous
Mushroom shaped
Lightly keratinized
Covering epithelium thin
CT core with blood vessels
Taste buds on upper surface
Rich blood supply give its red color
Slide10Vallate
(
circumvallate) papillae
Least numerous
Largest in size
Abundance of taste buds
Size = 1-3 mm & number is 8-12
Lie anterior to sulcus terminalis
Surrounded by groove
Ducts of deeply located serous glands (von
Ebner’s
) open into groove
Slide11FOLIATE PAPILLAE
Poorly developed in humans
Forms furrows on posterolateral aspect of tongue
Contain taste buds
Slide12Slide13Slide14TASTE BUDS
Receptors for taste sensation
Oval, pale staining bodiesExtends through thickness of epith
A small opening on epithelial surface at the apex of taste bud is Taste pore
Sensations
Sweet & salt- tip
Sour- sides
Bitter - back
Slide15Consists of 50-75
cells
Three principal cellsNeuroepithelial/ Gustatory
cells
having
microvilli
Supportive cells
Stem cells
Rest on basal lamina
Gustatory cells supplied by sensory axon
Slide16POSTERIOR 1/3
Irregular, nodular surface
Lingual tonsil (
Waldeyer’s
ring)
Crypts
Slide17Slide18