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Histology(MLHS-201)

Lecture 3

Tissue types

Dr. Afaf Mousaad• Department of Medical Laboratory Technology• Faculty of Allied Medical Sciences

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Learning objectives:

• Be able to classify epithelial tissues.

• Be able to correlate different types of epithelia

to their functions.

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The four tissue types are:– Epithelial tissue– Connective tissue– Muscular tissue– Nervous tissue

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•Epithelial tissue is made up of cells closely packed .

•The epithelial cells lie on the basement membrane .

•Avascular tissue .

•Replaces lost cells by cell division.

Epithelial Tissue:

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Functions of Epithelial Tissue

1.Protection: Epithelial tissue protects the

underlying tissues .

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2.Absorption: e.g. epithelial cells in the

small intestine .

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3.Secretion:

Epithelial cells of glands are

secretory cells.

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e.g. Olfactory mucosa.

A modified epithelium

containing specialized

sensory receptor cells .

4. Sensory:

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Classification of epithelia

• Number of cell layers– Simple– Stratified

• Shape of apical surface cells– Squamous– Cuboidal– Columnar

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1-Simple epithelium

a.Simple squamous epithelium

Example1. Bowman,s capsule

Classification of epithelial tissues:

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Example 3. The lung alveoli

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2. Simple cuboidal epithelium

kidney tubules

thyroid follicles

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1-Simple epithelium

3. Simple columnar epithelium:

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4.Pseudostratified ciliatedColumnar Epithelium

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Questions1.list the main types of tissues? • Epithelial tissue • Connective tissue • Muscle tissue • Nervous tissue 2.Which type of epithelia lining the abdominal cavity?Mesotheium3. Which type of epithelia is the stomach lining?Columnar epithelium4. Which type of epithelia consists of fried egg shaped

cells?Squamous epithelium

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5.Where do you find epithelial tissues in human body?

• skin • the lining of the mouth • the lining of blood vessels • lung alveoli • kidney tubules ,…

04/21/23

AssignmentsAssignment tittles األسم I.D م

Cell membrane

احمد حسن علي

ابراهيم حميدة51012009 1

احمد حسين احمد رسالن 51012010 2

احمد سعيد فرغلي أحمد 51012011 3

احمد شيخون محفوظ

محمد51012012 4

احمد محمد احمد عبد

العال 51012014 5

احمد محمد فوزي عبد

العظيم51012015 6

اخالص حمدي محمد

خليل51012016 7

اسراء علي محمود علي

فرحات51012017 8

Hypervitaminosis

عبد محمود صبحى فاطمه

الرحيم 51012101 1

السالم عبد محمد فاطمة

خليل محمد51012102 2

السعيد ابراهيم كريم

زيدان احمد51012103 3

عبد خليفه احمد كريم

المطلب51012104 4

عبد السالم عبد خالد كريم

المجيد51012105 5

هاشم احمد محمد كريم 51012106 6

قدوس ميالد ماريان

شنودة51012107 7

ابراهيم ابراهيم محمد

الهادي عبد51012108 8