The aim of these lab classes is to provide students with educational resources to acquire basic practical skills of each subject, recognize, locate and describe cell types and basic tissues. Each of these practical sessions are structured around three main elements: Also, epithelial tissue form secretory glands epithelial glands. However, we can find a cover epithelial tissue with scattered secretory cells.
Pre-Lab Reading Introduction Connective tissue is a term used to describe the tissue of mesodermal origin that that forms a Histology tissues and epithelial tissue beneath the epithelial layer and is a connecting or supporting framework for most of the organs of the body.
This lab will focus on the so-called connective tissue proper and cartilage; the next lab will focus on bone. Overview of Connective Tissue In contrast to epithelia, connective tissue is sparsely populated by cells and contains an extensive extracellular matrix consisting of protein fibers, glycoproteins, and proteoglycans.
The function of this type of tissue is to provide structural and mechanical support for other tissues, and to mediate the exchange of nutrients and waste between the circulation and other tissues.
These tissues have two principal components, an extracellular matrix and a variety of support cells. These two components will be the focus of this lab. Most frequently, the different types of connective tissues are specified by their content of three distinguishing types of extracellular fibers: Ground Substance The ground substance is an aqueous gel of glycoproteins and proteoglycans that occupies the space between cellular and fibrillar elements of the connective tissue.
It is characterized by a gel-like viscous consistency and is polyanionic. The characteristics of the ground substance determine the permeability of the connective tissue layer to solutes and proteins. Collagenous connective tissue is divided into two types, based upon the ratio of collagen fibers to ground substance: Loose areolar connective tissue is the most abundant form of collagenous connective tissue.
It occurs in small, elongated bundles separated by regions that contain ground substance. Dense connective tissue is enriched in collagen fibers with little ground substance. If the closely packed bundles of fibers are located in one direction, it is called regular; if oriented in multiple directions, it is referred to as irregular.
An example of regular dense connective tissue is that of tendons; an example of irregular dense connective tissue is that of the dermis.
Unlike the thick and coarse collagenous fibers, reticular fibers form a thin reticular network. Such networks are widespread among different tissues and form supporting frameworks in the liver, lymphoid organs, capillary endothelia, and muscle fibers.
Elastic Fibers Elastic fibers contain the protein elastin, which co-polymerizes with the protein fibrillin. These fibers are often organized into lamellar sheets, as in the walls of arteries.
Dense, regular, elastic tissue characterizes ligaments. Elastic fibers are stretchable because they are normally disorganized — stretching these fibers makes them take on an organized structure. Cells of the Connective Tissue Proper Although the connective tissue has a lower density of cells than the other tissues you will study this year, the cells of these tissues are extremely important.
Fibroblasts are by far the most common native cell type of connective tissue. The fibroblast synthesizes the collagen and ground substance of the extracellular matrix.
These cells make a large amount of protein that they secrete to build the connective tissue layer. Some fibroblasts have a contractile function; these are called myofibroblasts. Chondrocytes and osteocytes form the extracellular matrix of cartilage and bone.Histology, also microanatomy, is the study of the anatomy of cells and tissues of plants and animals using webkandii.com is commonly studied using a light microscope or electron microscope, the specimen having been sectioned, stained, and mounted on a microscope webkandii.comogical studies may be conducted using tissue culture, where live animal .
major tissue types: epithelial, connective, muscle and nervous tissues. In the Histology Modules of this course, you will learn to identify each of these tissue types as well as their.
The female reproductive system is composed of two gonads known as ovaries, two oviducts, the uterus, the vagina and external genitalia, and two mammary glands. Epithelium (/ ˌ ɛ p ɪ ˈ θ iː l i ə m /) is one of the four basic types of animal tissue, along with connective tissue, muscle tissue and nervous webkandii.comlial tissues line the outer surfaces of organs and blood vessels throughout the body, as well as the inner surfaces of cavities in many internal organs.
An example is the epidermis, the . Epithelium Study Guide. Epithelial tissue comprises one of the four basic tissue webkandii.com others are connective tissue (support cells, immune cells, blood cells), muscle tissue (contractile cells), and nervous webkandii.com represent various combinations of these four basic tissue types, which thus comprise the entire body.
This note covers the following topics: Basic Histological Techniques, Epithelial Components, Stratified Epithelia, Connective Tissue, Muscle Tissue, Nerve Tissue, Stains and Staining, Lymphoid Organs, Digestive System - Oral Cavity, Tract and Glands, Respiratory System, Endocrine System, Male Reproductive System and Female .