Lab#1Microscopy

&Epithelial Tissue

Lama AlAbdiSupervised by: Dr.

Reem AlAjmi

Genera!y, It is an instrument used to examine andmonitor objects we can’t see with the naked eye.It has many applications.

Microscope

There are different classes and types of microscopes dependingon the magnification power, their applications, and how theyare operated:Transmission electron microscope (TEM).Scanning electron microscope (SEM).Inverted microscope.Light (compound) microscope.

Types of microscopes

The compoundmicroscope is made of 3systems:The mounting andmovement System.The magnificationSystem.The i!umination System.

Compound Microscope

The mounting and movement system

The body tube:carries the ocular lensesThe arm:Supports and connects theupper part of the microscope

The coarse focusing knob:for stage movementThe fine focusing knob:for image sharpness

The nose piece:Carries the objective lenses andmove them accordingly above thestageThe stage:Horizontal platform upon whichthe slide of interest restThe base:

Supports the microscope

The ocular lenses:5X, 10X, and 15X

The objective lenses:Scanning lens: 3.5X or 4X or 5XLow power lens: 10XHigh power lens: 40XOil immersion lens: 100X

THE MAGNIFICATION SYSTEM

How to calculate the magnification power?Magnification power = ocular lens xobjective lens.(e.g.) 10X x 40X = 400X hint: Don’t forget the unit

THE ILLUMINATION SYSTEM

The illuminator:light source

The iris diaphragm:controls the amount of lightreaching the slide

The condenser:collects and concentrate the light

THE EPITHELIAL TISSUE

Prepared by : Reem Aldossari

Lab 2ZOO 103

Types of Epithelial Tissue

•Epithelial tissue can be divided into two groups depending on the number of layers of which it is composes.

simple epithelium: which consist of only

one layer

squamous epithelium

cuboidal epitheliu

m

columnar epithelium

StomachIntestineCollecting tubule

Thyroid gland

Lining of MouthTop view

Bowman’s capsuleSide view

stratified epithelium:

which consist of more than

one layer( Squamous,cubo

idal,columnar)Skin of Toad

( Frog )

Covering “surface” epithelium

.

Glandular

epithelium

Neuro_epithium

Types of Epithelial Tissue

•The Simple.•Stratified.

epithelium of cells

specialized to

produce secretion.

(Goblet cell)

•Epithelial tissue can be divided into two groups depending on their function of which it is composes.

Squamous epithelium

Simple Cuboidal Epithelium

Simple Columnar Epithelium

1

2

Glandular Epithelium

Stratified sequamous epithelium in skin keratinized and non keratinized

Stratified cuboidal epithelium in sweat gland

Thank you for your attention