HISTOLOGYTHE STUDY OF TISSUES

Four Major TissueTypes

Epithelial Tissue

Muscle Tissue

…..more tissues….

Nervous Tissue

Covers surfaces of body and forms glands

Very little matrix- mostly cells Some types have one free surface and one attached surface (to a basement membrane)

EPITHELIAL TISSUE

ProtectionBarrier Control of movement of substances

Secretingabsorption

FUNCTION:

PROTECT YOUR SKIN SO IT CAN PROTECT YOU!

TYPES OF EPITHELIUM: Simple Squamous(one layer) Functions in diffusion, secretion, protection Found in lungs and blood vessels

EPITHELIUM

Simple cuboidal Functions in active and passive transport and secretion Found in kidney tubules, lungs, ovaries

EPITHELIUM Simple columnar Functions in filtering air in lungs with cilia, secretion, and absorption Location: glands. Lungs, stomach, intestines

EPITHELIUM Pseudostratified columnar Functions in synthesis and secretion of mucus, movement of mucus Location: linings of respiratory system

Stratified Squamous (many layers) Functions: protects against abrasion,

infection, and water loss Found in: skin, mouth, respiratory tract,

eyes

STRATIFIED EPITHELIUM

Stratified Cuboidal epithelium Functions in: secretion, absorption, protection against infection

Found in: sweat gland and salivary gland ducts, ovaries

STRATIFIED EPITHELIUM

Stratified columnar epithelium Functions in: protection and secretion Found in: larynx, mammary gland ducts

STRATIFIED EPITHELIUM

Stratified cells appear cuboidal when tissue is relaxed and squamous when tissue is stretched.

Functions in: accommodate change of fluid volume in organs, protects against caustic urine.

Found in: urinary bladder, urethra, ureters

TRANSITIONAL EPITHELIUM