Epithelial tissue consists of tightly packed cells arranged in two fashions: membranous or glandular. Membranous epithelium lines both external surfaces like the epidermis and internal cavities like the pericardial, pleural, and peritoneal cavities. It also lines the cardiovascular system. Glandular epithelium forms glands that produce secretions and is found in parts of the respiratory, gastrointestinal, and urinogenital systems.

1. Epithelium
-Ladi Anudeep
ISM-IUK

2. • Human body consists of mainly four basic tissues
• They are: 1) Epithelial tissue
• 2) Muscles
• 3) Connective tissue
• 4) Nervous tissue

3. • Definition of epithelium
• These are special type of tissues which are made of
tightly packed cells that are opposing each other .
• These cells are present on basement membrane.
• They show polarity.
• They have no vascular tissue present in between
them,so they are called as Avascular tissues
• They are mitotically active and they dont have any blood
vessels

5. • Epithelial cells are arranged in two fashions
• 1) Membranous epithelium
• 2) Glandular epithelium
• Membranous epithelium
• In this the cells are arranged in sheath
• In human body, it lines the external surfaces(ex:
epidermis)
• It also lines some internal closed cavities

6. • Examples of internal closed cavities are
• 1) Pericardial cavity
• 2) Pleural cavity
• 3) Peritonial cavity
• It also lines the cardio vascular system which comprises
all the blood vessels.
• The epithelium which lines the blood vessels is called
endothelium

7. • Membranous epithelium lines body tubes that
communicate with exterior
• Ex: 1) Respiratory system
• 2) Gastro-intestinal system
• 3) Urino-genital system

8. • GLANDULAR TISSUE
• in some parts of the
body epithelial tissue
makes glandular tissue
• in glands, cells are
tightly packed with each
other and there is no
vascular tissue and they
can act as glandsand
produce different kinds of
secrections