Chapter 2 Epithelium, Slides of Histology

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Chapter 2

Epithelial tissue

Li Shu-Lei

instructor

Dept. Histology and Embryology, School of Basic

Medical Sciences , Jilin University

I General Biology of Epithelium

1.1 General structural features

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The cells are polarizable with free top surface andbasal surface that rests on a basal lamina.

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Adhesion between these cells is strong because oftight juncion.

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The space between adjacent epithelial cells is verynarrow and occupied by very little intercellularsubstance.

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There is innervation (nerve), but avascularity (noblood vessel), in epithelium.

Classification of epithelia

‹

Covering epithelium: which cover body surface or line the inner surface of body cavities, tubes and sac.

Glandular epithelium:

which main function is secretion.

II

Covering epithelium:

According to the number of cells layers

and morphology of cells

Simple epi

.: one layer of cells

Stratified epi

.: more than one layer

one layer flattened cells with flattened ellipicnucleus

cell borders are interdigitate. (wave-shaped).

The middle part of the cell is slightly thicker

---Distribution: ‹

endothelium:

lining the inner surface of cardiovascular

and lymphatic system.

mesothelium:

lining the inner surface of body cavities. thoracic, pericardiac and abdominal cavity

Other place: alveolus of lung, parietal layerof renal capsule

Simple squamous epi. (mesothelium) in surperficalview

sliver stain

nucleus

cytoplasma

Function:

a) transport materials b) facilitate movement of viscera

---

Distribution: the renal tubule

thyroid

ducts of many glands

---Function: covering and secretion

Simple cuboidal epithelium (arrow) from follicle ofthyroid.

HE stain.

one layer cells with hexagonal outline insurface view.

long columnar cell with elliptical nucleus inlateral view

---distribution: gastrointestinal tract

bladder uterus

---function: secretion and absorption

columnar cell: ciliated; basal cell:pyramid-shaped goblet cell: secreting mucinogen fusiform cell

basal cell

fusiform cell /columnar cell

---Distribution:inner surface of large duct of respiratory

tracheabronchinasal cavity