人体の組織

Tissues are a group of cells that share a common embryonic origin. Microscopic observation reveals that the cells in a tissue share morphological features …

Epithelial tissues are large sheets of cells covering all of the surfaces of the body. These surfaces can be internal or external, for example, skin, …

Cell adhesion molecules (CAMs) are pivotal to multicellularity and the coordinated functioning of tissues and organ systems. They enable physical …

The complex three-dimensional arrangement of cells in any multicellular organism is defined and maintained by interactions of cells with each other and …

Epithelial tissues are classified according to the shape of the cells and the number of cell layers formed. Cell shapes can be squamous (flattened and …

Simple epithelium consists of a single layer of cells that lines body cavities and blood vessels. The shape of the cells in the epithelium reflects the …

Stratified epithelium consists of several stacked layers of cells. They provide the durability to withstand constant physical and chemical attacks. …

The glandular epithelium is made of one or more epithelial cells modified to synthesize and secrete chemical substances. Glandular epithelia can be …

Exocrine glands are classified as unicellular and multicellular. The unicellular glands are scattered single cells, such as goblet cells, found in the …

Exocrine glands are those that release their secretions through ducts. Based on their mode of secretion, they can be classified into merocrine, apocrine, …

Exocrine glands produce and release a variety of glandular products. Exocrine glands can be classified into serous, mucous, or mixed types based on their …

Connective tissues are one of the four main tissue types in humans that are extensively present in the body. They are characterized by cells embedded in …

Connective tissues perform a broad range of functions in the body. Their primary function is to connect and link different tissues in the body and act as …

Unlike epithelial tissue, which is composed of cells closely packed with little or no extracellular space in between, connective tissue cells are …

The connective tissues have different properties and functions in the human body. They are broadly categorized into proper, supporting, or fluid …

Connective tissue proper is a class of connective tissue that encompasses all mature connective tissues except bone, cartilage, blood, and lymph. This …

During early development, the embryo forms two types of connective tissues— the mesenchyme and mucoid connective tissue. The mesenchyme is the first …

One of the significant functions of connective tissue is connecting tissues and organs. Unlike epithelial tissue that is composed of cells closely packed …

Loose connective tissue is found between many organs. Its main function is to absorb shock and bind tissues together. It also allows water, salts, and …

Dense connective tissue contains more collagen fibers than loose connective tissue. As a consequence, it displays greater resistance to stretching. There …

Fascia, a thin layer of fibrous connective tissue, is distributed throughout the body. It demarcates and forms a supportive covering over skeletal …

Bone tissue forms the internal skeleton of vertebrate animals, providing structure to the body. Bone Matrix Bone, or osseous tissue, is a connective …

A tissue membrane is a thin layer of cells that covers the outside of the body, the organs, internal passageways that lead to the exterior of the body, …

Blood and lymph are fluid connective tissues. They contain cells, also known as formed elements, circulating in a liquid extracellular matrix, the plasma. …

Following injury, the integrity of the injured tissues must be reestablished. For example, in skin tissue, wound repair involves coordination among …

Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and …