#epithelial tissue

Epithelial -- surface epithelium = carcinoma -- gland / duct epithelium = adenocarcinoma

Connective -- dense connective = fibrosarcoma -- cartilage = chondrosarcoma -- bone = osteosarcoma -- smooth muscle = leiomyosarcoma -- skeletal muscle = rhabdomyosarcoma

Nerve -- glial = glioblastoma -- meninges = meningeal sarcoma -- retina = retinoblastoma

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Day 93 of 100

Small habits, small steps and big wonders✨

A group of similar cells that work together to carry out a specific function its known as a tissue. There are four types of body tissue: Epithelial Tissue, Connective Tissue, Muscle Tissue and Nervous Tissue. We will see one by one with greater detail. 

Epithelial Tissue

It is made up of cells closely packed and ranged in one or more layers; this tissue covers the whole surface of the body. It is usually separated from the underlying tissue by a thin sheet of connective tissue known as base membrane (This membrane brings structural support and binds the epithelial tissue to other structures).

There are different types of Epithelial Tissue:

Squamous epithelium is made up with squamous cells that look like thin, flat plates. We can identify the type of epithelium with the cell form. These cells usually have horizontal flattened, elliptical nuclei. And they form the lining of cavities such as the mouth, blood vessels, heart and lungs.

Here are some images to help you visualize how the cell looks like. 

Source of the First Image 

Source of the Second Image

Structure: they appear as stratified cells that seem cuboidal when the organ or tube is not stretched and squamous when the organ or tube is stretched.

Function: They accommodate fluctuations in the volume of fluid in an organ or a tube.

Structure: It consists of several layers of cells. The epithelium can be nonkeratinized or keratinized. Nonkeratinized’s surface cells retain a nucleus and cytoplasm. Keratinized epithelium’s surface cells are replaced by protein and they are considered dead.

Function: It protects against abrasion, forms a barrier against infection, and reduces loss of of water from the body.