Alqusour Academy Oral Histo Final Lab

7/31/2019 Alqusour Academy Oral Histo Final Lab

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ALQUSOUR ACADEMY

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This slide shows 4 teeth along with their periodontium (which is the group of tissuessurrounding and anchoring the tooth)

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Hyalinelayer of dentine

Acellularcementum

locatedcervically

PDL Alveolarbone

2

1

Rootdentine


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Osteocytelying inlacuna

OsteoblastFibroblast

Epithelialrest of

malassez

Cementoblast

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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

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2

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Cementocyteslying inlacunae


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Cellularcementum

located apically

Cementocytes

lying inlacunae

Cementoclastsresorbing

primary toothroot

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1


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ALQUSOUR ACADEMY

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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

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2

2


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ALQUSOUR ACADEMY

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Dentine Matureenamel

Reduced enamel epithelium covering andprotecting the tooth during eruption

Oralmucosa

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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)

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Dental Pul

Dentalfollicle

Apical

foramen


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Internal proliferation zone(odontoblasts dentine)

External proliferation zone(cementoblasts cementum)

(fibroblasts PDL)(osteoblasts alveolar bone)

Epithelialdiaphragm

sandwichedbetween twoproliferation

zones

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ALQUSOUR ACADEMY

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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)

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1

Non-keratinocytes(clear cytoplasm

without keratohyalingranules or

Tonofilaments)

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2


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These non- keratinocytes are found in the supra basal layer and thats whythey are probably Langerhans cells

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Rete ridges of

stratum basale of the epithelium

Papillaryprojections o

papillary layerlamina propr

Non-keratinocy(clear cytopla

withoutkeratohyalingranules or

Tonofilament


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ALQUSOUR ACADEMY

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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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ALQUSOUR ACADEMY

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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

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3 1

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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

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Highly vascularizedcore

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ALQUSOUR ACADEMY

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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

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3

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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

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Taste buds located atthe lateral (non-

keratinized) surface of the papilla


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ALQUSOUR ACADEMY

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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

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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

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Fungiformpapillae with

their tastebuds on the

top(keratinized)surface of the

papilla

Filiformpapillae

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3


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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

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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

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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)

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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)


This slide shows the parotid major salivary gland

It is a serous gland ONLY

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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)


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)

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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

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Resting zone

Proliferation zone

Hypertrophy zone

Calcification zone

Ossification zone


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ALQUSOUR ACADEMY

This section sows an adult TMJ

This section shows a child TMJ

Not active and thinfibrocartilage

Very active and thickfibrocartilage

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Alqusour Academy Oral Histo Final Lab