Characteristic connective tissue cell types include both resident cells and immigrant or wandering cells. Fibroblasts which secrete the fibers and ground substance of the extracellular matrix. Adipocytes which store fat.
PAS diastase showing the fungus Histoplasma. Animal tissues are grouped into four basic types: Collections of tissues joined in structural units to serve a common function compose organs.
While all eumetazoan animals i. For example, the origin of the cells comprising a particular tissue type may differ developmentally for different classifications of animals. The epithelium in all birds and animals is derived from the ectoderm Describe connective tissue endoderm with a small contribution from the mesodermforming the endotheliuma specialized type of epithelium that composes the vasculature.
By contrast, a true epithelial tissue is present only in a single layer of cells held together via occluding junctions called tight junctionsto create a selectively permeable barrier.
This tissue covers all organismal surfaces that come in contact with the external environment such as the skinthe airways, and the digestive tract.
It serves functions of protection, secretionand absorption, and is separated from other tissues below by a basal lamina. Connective tissue Connective tissues are fibreous tissues. They are made up of cells separated by non-living material, which is called an extracellular matrix. This matrix can be liquid or rigid.
Connective tissue gives shape to organs and holds them in place. Blood, bone, tendon, ligament, adipose and areolar tissues are examples of connective tissues. One method of classifying connective tissues is to divide them into three types: Muscle tissue Muscle cells form the active contractile tissue of the body known as muscle tissue or muscular tissue.
Muscle tissue functions to produce force and cause motioneither locomotion or movement within internal organs. Muscle tissue is separated into three distinct categories: Nervous tissue Cells comprising the central nervous system and peripheral nervous system are classified as nervous or neural tissue.
In the central nervous system, neural tissues form the brain and spinal cord. In the peripheral nervous system, neural tissues form the cranial nerves and spinal nervesinclusive of the motor neurons.
Epithelium The epithelial tissues are formed by cells that cover the organ surfaces such as the surface of skinthe airwaysthe reproductive tractand the inner lining of the digestive tract.
The cells comprising an epithelial layer are linked via semi-permeable, tight junctions ; hence, this tissue provides a barrier between the external environment and the organ it covers.
In addition to this protective function, epithelial tissue may also be specialized to function in secretionexcretion and absorption. Epithelial tissue helps to protect organs from microorganisms, injury, and fluid loss. Functions of epithelial tissue: Inside the body, epithelial cells form the lining of the mouth and alimentary canal and protect these organs.
Epithelial tissues help in absorption of water and nutrients. Epithelial tissues help in elimination of waste. Some epithelial tissue perform secretory functions. There are many kinds of epithelium, and nomenclature is somewhat variable.
Most classification schemes combine a description of the cell-shape in the upper layer of the epithelium with a word denoting the number of layers: However, other cellular features, such as cilia may also be described in the classification system.
Some common kinds of epithelium are listed below:fatty tissue; type of loose connective tissue that stores energy, insulates and cushions the body fibrous Tissue composed of bundles of collagenous white fibers between which are rows of connective tissue cells.
The endomysium is the connective tissue that surrounds each muscle fiber (cell).; The perimysium encircles a group of muscle fibers, forming a fascicle.; The epimysium encircles all the fascicles to form a complete muscle.; A tendon is a cordlike extension of the preceding three barnweddingvt.com extends beyond the muscle tissue to connect the muscle to a bone or to other muscles.
Connective tissue (CT) is a one of the four main classes of tissues. Although it is the most abundant and widely distributed of the primary tissues, the amount of connective tissue in a particular organ varies.
Connective tissue disease refers to a group of disorders involving the protein-rich tissue that supports organs and other parts of the body. Examples of connective tissue are fat, bone, and cartilage.
Connective tissue (CT) is one of the four basic types of animal tissue, along with epithelial tissue, muscle tissue, and nervous tissue. It develops from the mesoderm. Connective tissue is found in between other tissues everywhere in . Connective tissue is a mesenchyme that fastens together other more highly organized tissues.
The solidity of various connective tissues varies according to the consistency of their extracellular matrix, which in turn depends on the water content of the gels, the amount and type of polysaccharides.