COMPOUND EPITHELIUMLAB EXERCISE 2.

BY PROF. DR.ANSARIApril 22, 2023

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OBJECTIVES

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DEFINITION CLASSIFICATION TYPES EXAMPLES FUNCTIONS IDENTIFICATION

DEFINITION OF COMPOUND EPITHELIUM

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A multilayered arrangement of cells, Only basal cells resting on the basement

membrane. Apical cells vary in shape and size. A group of cells arranged in many layers, with

out having intercellular spaces and material like fibers and ground substance.

It is also called as stratified epithelium.

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CLASSIFICATION OF COMPOUND EPITHELIUM

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Stratified Squamous non keratinized, Stratified Squamous Keratinized, Stratified Columnar, Stratified Cuboidal, Transitional/ Urothelium & Pseudo stratified ciliated columnar. Specialized epithelium,

STRATIFIED SQUAMOUS NON KERATINIZED EPITHELIUM

FOUND IN ESOPHAGUS, VAGINA,CORNEA,CONJUNCTIVA , PALATINE TONSIL & TONGUE

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Vagina histology shows stratified squamous non keratinized epithelium

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Cornea shows stratified squamous nonkeratinized epithelium

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Tongue surface epithelium is stratified squamous non keratinized

STRATIFIED SQUAMOUS KERATINIZED EPITHELIUM

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THE SUPERFICIAL LAYERS OF CELLS DIES AND FORMS THE KERATIN LAYER,KERATIN IS A PROTECTIVE LAYER THAT HELPS IN ‘WEAR’ N ‘TEAR’

Skin, scalp, palm & sole showed stratified squamous keratinized epithelium

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STRATIFIED COLUMNAR EPITHELIUM

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1. Stratified columnar epithelium

is very rare2.It is found in the largest duct of salivary glands (Parotid, Submandibular)

STRATIFIED CUBOIDAL EPITHELIUMFOUND IN THE DUCT OF SWEAT GLANDS

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THE FOLLICULAR CELLS OF OOCYTE ARE STRATIFIED CUBOIDAL EPITHELIUM

THE FOLLICULAR CELLS OF OOCYTE ARE STRATIFIED CUBOIDAL EPITHELIUM

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The transitional Epithelium/UROTHELIUM

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1.The transitional epithelium is a special type of stratified epithelium.

2. It is found in urinary passages.

3.When the bladder is full, the apical cells stretches and become squamous.

4.In the relaxed bladder, the apical cells are balloon like/ umbrella like/dome like.

1.The transitional epithelium is a special type of stratified epithelium.

2. It is found in urinary passages.

3.When the bladder is full, the apical cells stretches and become squamous.

4.In the relaxed bladder, the apical cells are balloon like/ umbrella like/dome like.

PSEUDOSTRATIFIED CILIATED COLUMNAR EPITHELIUM

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Pseudo stratified columnar epithelium with stereo cilia - epidydimis

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SPECIALISED EPITHELIUM

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1. Olfactory epithelium is specialized

2. The olfactory cells are modified bipolar neuronal cells.

There is no regeneration in these cells, no mitosis

They carry yellow pigment.

Found in the roof and on nasal turbinate.3. Taste buds also have specialized

epithelium.4. The hair cells of inner ear are also modified epithelium SC= SUSTENTACULAR CELL,OC=OLFACTORY CELL,BC=BASAL CELL.

1. Olfactory epithelium is specialized

2. The olfactory cells are modified bipolar neuronal cells.

There is no regeneration in these cells, no mitosis

They carry yellow pigment.

Found in the roof and on nasal turbinate.3. Taste buds also have specialized

epithelium.4. The hair cells of inner ear are also modified epithelium SC= SUSTENTACULAR CELL,OC=OLFACTORY CELL,BC=BASAL CELL.

Applied anatomy

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1.All glands arise from epithelium.

2.The tumor arising from epithelium is called as cancer.

3.Kartagener’s syndrome is due to non action of cilia resulting in Bronchectesis, dextrocarida and situs in versus.