DIAPHRAGM Meaning and
Definition
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The diaphragm, in human anatomy, refers to a thin, dome-shaped muscle that separates the chest cavity from the abdominal cavity. It plays a crucial role in the process of respiration, working in coordination with the lungs and rib cage to facilitate breathing. When one inhales, the diaphragm contracts and flattens, thereby increasing the volume of the chest cavity and causing the lungs to expand. This allows air to be drawn into the lungs. Conversely, during exhalation, the diaphragm relaxes and returns to its dome shape, reducing the volume of the chest cavity and pushing air out of the lungs.
Apart from its respiration-related function, the diaphragm also serves as a support for other organs in the abdominal cavity. It attaches to the lower ribs, sternum, and lumbar vertebrae, providing stability to the thoracic region. This muscle is innervated by the phrenic nerve, which originates from the spinal cord at the level of the neck.
Diaphragm is also a term used to describe a contraceptive device. In this context, it refers to a shallow, dome-shaped barrier made of silicone or latex that is inserted into the vagina to cover the cervix. It works by blocking sperm from entering the uterus and thus preventing pregnancy. When used correctly and consistently, the diaphragm can be an effective method of contraception.
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1. Midriff, phren, the musculomem-branous partition between the abdominal and thoracic cavities; it is two-dome shaped with concavities toward the abdomen; the upper surface is in relation with the heart and lungs, the under surface with the liver, stomach, and spleen. 2. A thin disc pierced with a hole of definite size, used in a microscope, camera, or other optical instrument in order to shut out the marginal rays of light, thus giving a more direct illumination.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
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The midriff; a muscle or membrane separating the chest or thorax from the abdomen or belly; any substance that intercepts or divides.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
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Etymology of DIAPHRAGM
The word "diaphragm" originates from the late Middle English word "diaphragme", which was derived from the Latin word "diaphragma". The Latin term was derived from the Greek word "diáphragma", which means "partition" or "midriff". This Greek word was formed by combining the prefix "dia-" (meaning "through" or "across") and "phrázō" (meaning "block", "fence", or "hinder"). Therefore, the word "diaphragm" refers to a partition that separates different areas or functions within the body, such as the muscular partition that separates the thoracic and abdominal cavities and assists in breathing.
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