Anatomy Lab: Histology

Epithelial Tissues, Connective Tissues, Membranes

Define a tissue.

Tissues are a group of cells that are similar in structure and function

Name the 4 types of tissues.

1. Epithelial

2. Connective

3. Nervous

4. Muscle

Classify each of the following epithelial cells

How do we classify epithelia?

Classification is based on the number of cell layers

Identify this epithelium.

Simple Cubodial

Epithelium: Simple Columnar

Description: A single layer of tall cells with round to oval nuclei

• many cells have microvilli and some have cilla

• layer main contain mucus-secreting unicellular glands (goblet cells)

Function: Absorption, secretion of mucus, enzymes, etc.

• Ciliated type: propels mucus (or reproductive cells) —> ciliary action; lines small bronchi, uterine tubes, and some regions of the uterus

• Nonciliated type: lines most of the digestive tract (stomach to rectum), gallbladder, and excretory ducts (of some glands)

Identify this epithelium.

Simple Columnar

Epithelium: Stratified Squamous

Description: A thick epithelium composed of several layers

• basal cells are cuboidal or columnar and are metabolically active. Active in mitosis and produce the cells of the more superficial layers

• Surface cells are flattened (squamous): in the keratinized type the surface cells are full of keratin and dead

Function: Protects underlying tissues in areas subjected to abrasion

Location:

Nonkeratinized type: forms the moist linings of the esophagus, mouth, and vagina

Keratiized: forms the epidermis of the skin, a dry epithelium

Identify this epithelium.

Nonkeratinized Stratified Squamous

Identify this epithelium.

Keratinized Stratified Squamous

Identify this epithelium.

Stratified Cuboidal

Identify this epithelium.

Stratified Columnar