Lecture7
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This document provides an overview of epithelial tissue, including its definition, classification, characteristics, and locations in the body. It discusses the four primary tissue types - epithelial, connective, muscle, and nerve tissue. It focuses on epithelial tissue, describing the two main types (simple and stratified), their subtypes based on cell shape, and examples of each epithelium's location and function. Key points covered include that epithelial tissue lines surfaces, derives from all germ layers, and lacks blood vessels.
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Epithelial and connective tissues are the two main types of tissues in the body. Epithelial tissue lines the outer surfaces and inner cavities of the body. It is classified as single-layered (simple) or multi-layered (stratified) epithelium. Common types include squamous, cuboidal, columnar, transitional, and pseudostratified columnar epithelium. Connective tissue supports and binds other tissues. It contains ground substance and fibers, along with fibroblasts, adipocytes and immune cells. Major forms are loose connective tissue, dense connective tissue, regular dense connective tissue, elastic connective tissue, and reticular connective tissue.
The Tissue level of organization .pptx
Tissues are a group of similar cells of the same origin that carry out a specific function together. Humans have four different types of basic tissues. Connective tissues such as bone tissue are made up of fibrous cells and give shape and structure to organs. Muscle tissue is made up of cells that can contract together and allow animals to move. Epithelial tissues make up the outer layers of organs, such as the skin or the outer layer of the stomach. Nervous tissue is made of specialized cells that transmit information through electrochemical impulses, such as the tissue of nerves, the spinal cord, and the brain.
Tissues
Tissues are groups of similar cells that work together to perform a specific function. The four main types of tissues are epithelial, connective, muscle, and nervous tissue. Epithelial tissues cover external and internal surfaces of the body, and glandular epithelial tissue produces secretions. Connective tissues bind and support other tissues, and include specialized varieties such as bone, cartilage, and blood. Muscle tissues control movement, with skeletal muscle enabling voluntary movement, and smooth and cardiac muscles involved in involuntary functions such as digestion and heartbeat. Nervous tissue transmits signals around the body through neurons and neuroglia support cells.
EPITHELIA TISSUES.ppt
The document summarizes the key characteristics of epithelial tissue. It describes epithelial tissue as consisting of closely packed cells that cover external and internal surfaces of the body and sometimes form glands. The main points are:
- Epithelial cells are polarized and attached to an underlying basement membrane. They vary in shape but generally have no intercellular material between them.
- Epithelial tissues are not penetrated by blood vessels and receive nutrients through diffusion from underlying connective tissue.
- Epithelial cells form all types of glands and serve functions like absorption, secretion, protection and signaling.
- Epithelial tissues are classified based on cell shape, number of cell layers, and special features - including
Anatomy :O
The document provides an overview of histology topics including the four primary tissue types, characteristics of epithelial and connective tissues, and an introduction to muscle and nervous tissues. It discusses the major characteristics and functions of epithelial tissues like simple squamous, simple cuboidal, stratified squamous, and pseudostratified columnar epithelium. It also summarizes the cells, extracellular matrix, and functions of the main types of connective tissues including loose connective tissue, cartilage, bone, and blood.
3.tissues of body
This document provides an overview of different types of tissues in the human body. It discusses epithelial tissues, which include simple and stratified epithelia. Examples are given such as simple squamous, cuboidal, and columnar epithelia. Glandular epithelia are also described. The document then summarizes connective tissues, including connective tissue proper, cartilage, bone, and blood. It identifies fibroblasts, chondroblasts, and osteoblasts as cells that secrete the extracellular matrix. Finally, it classifies connective tissues and describes examples such as areolar, dense regular, and elastic connective tissues.
Epithelial Tissue Histology
Epithelial tissue, also known as the epithelium, is one of the four tissues found in the human body. It exists in various parts of the body, such as our digestive system, outer surfaces of organs and blood vessels throughout the body, as well as the inner surfaces of cavities in many internal organs.
Histology
Junqueira’s Basic Histology Text and Atlas, 15th Ed
CELL TYPES, FUNCTIONS, AND MODIFICATION.pptx
The document discusses four main types of animal tissues: epithelial tissue, connective tissue, muscle tissue, and nervous tissue. It provides details on the structure and function of each type of tissue. Cell specialization or modification occurs after cell division, structurally modifying newly formed cells so they can perform functions efficiently. The summary discusses types of cell modification including those on the apical, basal, and lateral surfaces of cells.
Histology
This document provides an overview of tissues and histology. It discusses the four main types of tissues - epithelial, connective, muscle and nervous. It describes the characteristics and functions of epithelial tissues, including the different classifications of epithelium based on cell shape and layering. It also discusses the structural components of connective tissues, including ground substance, fibers and cells.
anatomy
The structure of epithelium is adapted to its functions. Epithelial tissue forms the outer layer of skin and lines body cavities and organs. It has several key characteristics, including cellularity, specialized cell junctions, and polarity between apical and basal surfaces. Epithelial cells regenerate quickly and have specialized structures like microvilli and cilia that increase surface area for functions like absorption, secretion, and transport. Different epithelial types have distinct structures tailored to their roles, such as stratified squamous epithelium resisting abrasion in the skin and transitional epithelium enabling organ distension in the urinary bladder. In summary, epithelial structure supports its diverse functions in various tissues and organs throughout the body.
STPM: Specialization of animal cells
This document summarizes the key types of epithelial tissues, nervous tissues, muscle tissues, connective tissues, and blood. It describes the structure and function of simple squamous, cuboidal, and columnar epithelia. It also discusses the three main types of neurons and the roles of neuroglia. The three types of muscle tissue - smooth, cardiac, and striated muscle - are outlined. Finally, it provides details on bones, cartilage, blood components like erythrocytes and leukocytes, and their functions in the body.
study of epithelium.pptx
This document summarizes different types of epithelium. It describes epithelium as sheets of cells that line body surfaces and cavities. Epithelia have principal functions of covering, lining, protecting, absorbing, and secreting. The document then classifies epithelium based on cell layers and morphology into simple, stratified, and glandular epithelium. It provides examples and descriptions of each type of epithelium and their functions.
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Lecture7
- 3. Epithelial tissue is composed of cells that are in close apposition with one another; among cells there is present only a small amount of intercellular substance e pithelial cells are usually of regular form without extensive cytoplasmic processes a dhesion between the cells is very strong e pithelia derive from the all germ layers Connective and supporting tissues unlike epithelia, contain cells that are separated from one another by intervening spaces , these contain intercellular material or substance produced by cells t he intercellular substance consists of two components: fibers and amorphous ground substance c onnective and supporting tissues are always of mesenchymal origin Muscle tissue is composed of elongated cells that are able to contract f or this function cells are well adapted as they contain contractile proteins: actin and myosin cells or muscle fibers tend to be aggregated in bundles that are conspicuously different from the surroundings tissues t wo types of muscle tissue are distinguished: smooth , skeletal and cardiac s mooth muscle tissue derives from the mesenchyme, striated muscle tissue from the mesoderm Nerve tissue consists of nerve cells - neurons , and associated supporting cells of various type called neuroglia n eurons are highly specialized cells that show ability to receive, generate and transmit nerve impulses e xcept the microglia, the nervous tissue derives from the neuroectoderm
- 8. Simple epithelia: - simple squamous epithelium - simple cuboidal epithelium - simple columnar epithelium - pseudostratified columnar epithelium Stratified epithelia: - stratified squamous epithelium - stratified columnar/ cuboidal epithelium - transitional epithelium
- 12. a simple cuboidal epithelium
- 13. simple columnar epithelium with striated border (microvilli)
- 14. a simple columnar ciliated epithelium (with kinocilia)
- 17. stratified squamous epithelium stratified squamous epithelium (cornified) = epidermis
- 25. holocrine secretion the discharge of product is a ssociated with a destruction of the whole glandular cells cells of sebaceous glands
- 35. acinar / alveoli /
- 37. tubuloacinar / tubules with serous demilunes /
- 38. tubule with serous demilune = demilune of Gianuzzi
- 43. cone cell rod cell
- 44. taste bud with taste cells hair cells (utricle)
Editor's Notes
- covering or protective - cells cover external and internal surfaces of human body and protect underlying tissues against loss moisture and mechanical damage,
- Goblet cells are glandular simple columnar epithelial cells whose sole function is to secrete mucin , which dissolves in water to form mucus .