Histology Epithelia Part 1

1. Simple Squamous Epithelium:

Features:

- Height is much smaller than width.

- Disc shaped central nuclei.

- Single layer of flat cells.

- Reduces friction by providing smooth surface and helps in rapid transportation.

- Helps in passage of material by diffusion or filtration.

Examples:

-Endothelium: Heart, Blood Vessels and Lymphatics

-Mesothelium: Pericardium and Pleura Peritoneum

-Others: Alveoli of Lungs and Glomeruli in Kidney etc.

2. Simple Cuboidal Epithelium:

Features:

- Height and width are equal in length.

- Single layer cube like cells.

- Helps in secretion, absorption and excretion.

Locations:

-Secretory portions of glands like thyroid or mammary or salivary.

-Proximal Convulated Tubules of the Kidney.

3. Simple Columnar Epithelium:

Features:

- Heights are much smaller than width.

- Oval nucleus elongated towards base (not touching the base though).

- Helps in absorption or mucus secretion in all digestive tracts (stomach or intestine)

Location:

-Uterus

-Gall Bladder

Simple Columnar Epithelium is of two types:

a)Simple Ciliated Columnar Epithelium:

-On free surface - thread like cilia for motility.

Examples:

-Olfactory mucosa,

-Ventricles of Brain,

-Central of Spinal Cord,

-Inner lining of Uterus Cavity.

b)Simple Columnar Epithelium Microvilli:

-Thin elongations of cell membrane along with cytoplasm.

-Brush Boarder is present which increases surface area.

Examples:

-In Small Intestine,

-In Gall Bladder.

4. Pseudostratified Columnar Epithelium:

Features:

- Cells of different heights.

- Nuclei at different levels.

- Helps in secretion and propulation of mucous

Locations:

-Trachea and most of the upper respiratory system.

-Vas deferens and ducts of large glands.

FOR FURTHER UPDATES FOLLOW US ON:-

FACEBOOK: https://www.facebook.com/profile.php?id=100093011762038&mibextid=ZbWKwL

YOUTUBE: https://youtube.com/@HimzyWorld?si=oKqVrWe1h9zmBJgw