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This slide shows 4 teeth along with their periodontium (which is the group of tissuessurrounding and anchoring the tooth)
1
Hyalinelayer of dentine
Acellularcementum
locatedcervically
PDL Alveolarbone
2
1
Rootdentine
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Osteocytelying inlacuna
OsteoblastFibroblast
Epithelialrest of
malassez
Cementoblast
2
3 1
2
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Cementum is the thinnest cervically
Acellular cementum is located cervically
Cementum is the thickest apically
Cellular cementum is located apically
Cellular cementum is located at furcation area
1
2
3
Cementocyteslying inlacunae
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1
Cellularcementum
located apically
Cementocytes
lying inlacunae
Cementoclastsresorbing
primary toothroot
2
1
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Hyalinelayer of dentine
Acellularcementum
locatedcervically
DentineEpithelialrest of
malassez
Cementoblast
Fibroblast
Deciduous toothundergoing root
formation
Permanent
successor toothlocated lingual to itspredecessor within
the same bony crypt
1
2
2
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Dentine Matureenamel
Reduced enamel epithelium covering andprotecting the tooth during eruption
Oralmucosa
1
2
Predentine
Dentine
CementumEpithelial
diaphragm
(It is the internalangle of the ERSand it is the onlysite where ERS
can be viewed asa continuous
sheath
Epithelial rests of malassez (epithelialroot sheath after fragmentation)
3
Dental Pul
Dentalfollicle
Apical
foramen
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3
Internal proliferation zone(odontoblasts dentine)
External proliferation zone(cementoblasts cementum)
(fibroblasts PDL)(osteoblasts alveolar bone)
Epithelialdiaphragm
sandwichedbetween twoproliferation
zones
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This slide shows a keratinized epithelium and its layers (upside down)
These non- keratinocytes are found within stratum basale and thats whythey might be either Melanocytes or Markel cells but not Langerhans cells
which are found in supra basal layers
If this epithelium is non-keratinized then these non-keratinocytes areMelanocytes but not Markel cells which only exist in keratinized
epithelium
Stratumcorneum
(Ortho-keratinlayer)
Stratumgranulosum
(Keratinocytesare flat and
containkeratohyalin
granules))
Stratumspinosum
(Thickest layer)
Stratum basale
(Mitotic layer)
2
1
Non-keratinocytes(clear cytoplasm
without keratohyalingranules or
Tonofilaments)
3
2
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These non- keratinocytes are found in the supra basal layer and thats whythey are probably Langerhans cells
1
Rete ridges of
stratum basale of the epithelium
Papillaryprojections o
papillary layerlamina propr
Non-keratinocy(clear cytopla
withoutkeratohyalingranules or
Tonofilament
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This slide shows a non-keratinized epithelium and its layers
This non-keratinocyte is found in the supra basal layer and thats whyit is probably Langerhans cell (antigen-presenting cell)
Stratum superficiale
Stratum intermedium
Stratum basale
2
1
2
Non-keratinocytes(clear cytoplasm
without keratohyalingranules or
Tonofilaments)
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This is a coronal section through the tongue which is covered with masticatory and specializedmucosa that contains numerous taste buds and papillae
This section was taken from the anterior two thirds of the tongue to view Fungiform papillae
1
3 1
2
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They are mushroom-shaped papillae
They are interspersed between Filiform papillae in the anterior 2/3s of the dorsum of the tongue
They are few in number, but they get more numerous near the tip of the tongue
They aren't surrounded with trench-like feature or cleft as in other papillae
This section was taken from the anterior two thirds of the tongue to view Filiform papillae
They are found in the anterior 2/3s of the dorsum of the tongue
They are thread-like papillae that contain NO taste buds and the most numerous in number
Their main function is to give the rough masticatory surface of the tongue
Taste buds located onthe top (keratinized)surface of the a illa
3
Highly vascularizedcore
2
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This section was taken at the level between the posterior one third and anterior two
thirds of the tongue to view circumvallate papillae
This slide shows the circumvallate papilla which is located in the most posterior region of the anterior 2/3rds of the tongue just anterior to sulcus terminalis
Its top surface is keratinized while its lateral surfaces are non-keratinized and its core is highly vascularized
It is surrounded by a trench-like feature where taste sensation takes place
1
1
3
2
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This slide show von Ebner minor salivary glands which are associated with circumvallatepapillae and empty their water secretions at the flour of the trench
They are made of ONLY serous Acini (which are dark in color)
They are the only serous minor salivary glands
3
2
Taste buds located atthe lateral (non-
keratinized) surface of the papilla
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This section was taken at the level between the posterior one third and anterior two thirds of thetongue to view circumvallate papillae
1
Taste budslocated at thelateral (non-keratinized)
surface of thepapilla
Trench-like
feature
(Where tastesensation
takes place)
Von Ebnerserous minor
salivaryglands
Intrinsicmuscles of the tongue
The top (keratinized) surface of the papilla which doesn't projectbeyond the surface of the tongue and doesn't contain any papilla
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This is a longitudinal section of the tongue
1
1
Fungiformpapillae with
their tastebuds on the
top(keratinized)surface of the
papilla
Filiformpapillae
2
3
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2
Von Ebnerserous minor
salivary glandsassociated withCircumvallatepapillae andfound in the
posterior regionof the anterior2/3rds of the
dorsum of thetongue
Lingual mucousminor salivary
glands found inthe posterior
1/3 rd of thetongue andrelated to
lingual tonsils
3
Lingual tonsils(lymphoid
tissues"collection of lymphocytes"found in thebase of the
tongue in theposterior 1/3
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They are located at the side of the posterior 1/3 of the tongue
They have one or two longitudinal clefts or grooves laterally
The top surface of these papillae is keratinized but the lateral surface is non-keratinized
Their tastes buds are found within the lateral non-keratinized surface (encircled structures)
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This slide shows the submandibular major salivary gland
It is covered by a fibrous capsule and divided into a number of lobes which are farther divided into a number of lobules
It is a mixed gland (serous and mucous secretions together) but serous secretions are much more dominant
The majority of Acini are serous Acini (dark in color)
Intra-lobular ducts include: acinus lumen, intercalated ducts and striated ducts
Inter-lobular ducts include: collecting duct
1
1Serousacinus
(demiluncapping th
mucusacinus)
Mucousacinus
Intercalated
ducts
(Drain fromseveral
Acini andlined with
simplecuboidal
epithelium)
Striated duct (drain from several intercalated ducts and lined with simple columnar epithelium)
2
Acinus
lumen
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As ducts get bigger and bigger, they get surrounded by thick connective tissue adventitia. Collecting ducts are inter-lobular ducts and they drain several striated ducts into the main excretory duct
The duct in here is very big and surrounded with a thick connective tissue adventitia and that's why it is probablythe main duct
Beside the duct we have a big blood vessel with many extravasated erythrocytes (RBCs)
This slide shows the sublingual major salivary gland
It is a mixed gland (serous and mucous secretions together) but mucous secretions are much more dominant
2
1
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The majority of Acini are mucous Acini (pale in color)
Intra-lobular ducts include: acinus lumen and intercalated ducts only (no striated ducts)
Inter-lobular ducts include: collecting duct
This slide shows the parotid major salivary gland
It is a serous gland ONLY
1
Serousacinus
(demiluncapping th
mucusacinus)
Mucousacinus
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All of the Acini are serous Acini (dark in color)
Intra-lobular ducts include: acinus lumen and intercalated ducts only (no striated ducts)
Inter-lobular ducts include: collecting duct
This section is taken from an infant's parotid gland because of the huge amount of connectivetissue (stroma) and fat cells present and the little amount of the secretory tissue (parenchyma)
1
1
Adiposetissue
SerousAcini
Intercalatedduct
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Notice that chondrocytes don't occur in parallel rows, but they are scattered and they all go towardone side (one-sided growth)
Notice that we have little amount of extracellular matrix and most of the volume is for the cells
Bone is pink in color while cartilage is blue in color
Endochondral ossification in the condylar process provides growth for the ramus of the mandible upto the age of 21
2
Resting zone
Proliferation zone
Hypertrophy zone
Calcification zone
Ossification zone
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This section sows an adult TMJ
This section shows a child TMJ
Not active and thinfibrocartilage
Very active and thickfibrocartilage