Serous membranes are covered by a thin layer of serous fluid that is secreted by the epithelium. Serous fluid lubricates the membrane and reduces friction and abrasion when organs in the thoracic or abdominopelvic cavity move against each other or the cavity wall. Serous membranes have special names given according to their location. For example, the serous membrane that lines the thoracic cavity and covers the lungs is called pleura.
Connective tissue membranes contain only connective tissue. The zygote is described as totipotent because it ultimately gives rise to all the cells in your body including the highly specialized cells of your nervous system. Describe this transition, discussing the steps and processes that lead to these specialized cells. The zygote divides into many cells. As these cells become specialized, they lose their ability to differentiate into all tissues.
At first they form the three primary germ layers. Following the cells of the ectodermal germ layer, they too become more restricted in what they can form. Ultimately, some of these ectodermal cells become further restricted and differentiate in to nerve cells. Synovial membranes are a type of connective tissue membrane that supports mobility in joints. The membrane lines the joint cavity and contains fibroblasts that produce hyaluronan, which leads to the production of synovial fluid, a natural lubricant that enables the bones of a joint to move freely against one another.
Skip to content The Tissue Level of Organization. Learning Objectives By the end of this section, you will be able to: Identify the four main tissue types Discuss the functions of each tissue type Relate the structure of each tissue type to their function Discuss the embryonic origin of tissue Identify the three major germ layers Identify the main types of tissue membranes.
The Four Types of Tissues Epithelial tissue , also referred to as epithelium, refers to the sheets of cells that cover exterior surfaces of the body, lines internal cavities and passageways, and forms certain glands. Four Types of Tissue: Body. The four types of tissues are exemplified in nervous tissue, stratified squamous epithelial tissue, cardiac muscle tissue, and connective tissue in small intestine. Embryonic Origin of Tissues and Major Organs. Tissue Membranes A tissue membrane is a thin layer or sheet of cells that covers the outside of the body for example, skin , the organs for example, pericardium , internal passageways that lead to the exterior of the body for example, abdominal mesenteries , and the lining of the moveable joint cavities.
Tissue Membranes. The two broad categories of tissue membranes in the body are 1 connective tissue membranes, which include synovial membranes, and 2 epithelial membranes, which include mucous membranes, serous membranes, and the cutaneous membrane, in other words, the skin.
Epithelial Membranes The epithelial membrane is composed of epithelium attached to a layer of connective tissue, for example, your skin. Chapter Review The human body contains more than types of cells that can all be classified into four types of tissues: epithelial, connective, muscle, and nervous. Interactive Link Questions View this slideshow to learn more about stem cells. Most somatic stem cells give rise to only a few cell types. Like the latter, their role is to protect the body against external elements.
Most of them secrete a thick, viscous substance called mucous, hence their name. Location of the mucous membranes The mucous membranes are thin and soft tissue that lines the cavities of the body which are contiguous with the skin and exposed to the external environment.
The shape and arrangement of the epithelial cells vary depending on their location. Common oral manifestations of systemic disease. Otolaryngol Clin North Am. A pilot clinical evaluation of oral mucosal dryness in dehydrated patients using a moisture-checking device.
Clin Exp Dent Res. Lim DJ. Functional morphology of the mucosa of the middle ear and eustachian tube. Ann Otol Rhinol Laryngol. National Cancer Institute. SEER training modules: membranes. Biology of oral mucosa and esophagus. J Natl Cancer Inst Monogr. Sulyanto R. Biology of the mouth. Updated August Your Privacy Rights.
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I Accept Show Purposes. Table of Contents View All. Table of Contents. Aging and Mucous Membranes. Oral Mucous Membranes.
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