Sheath
Sheath (pronunciation: /ʃiːθ/) is a term used in various fields of medicine.
Etymology
The word "sheath" originates from the Old English word "sceath", which means a case or covering.
Definition
In medicine, a sheath is a protective casing or cover. It is often used to refer to natural or synthetic coverings of certain body parts or medical devices.
Medical Usage
In the field of Anatomy, a sheath often refers to a structure that encloses another. For example, the fascial sheath is a layer of connective tissue that surrounds muscles, groups of muscles, blood vessels, and nerves, binding some structures together, while permitting others to slide smoothly over each other.
In Surgery, a sheath can refer to a protective covering used to encase a sharp surgical instrument, such as a scalpel or needle, to prevent accidental injury.
In Interventional Radiology, a sheath is a tube through which catheters, wires, or other instruments are inserted into the body. For example, an introducer sheath is used in procedures such as angioplasty and stenting.
Related Terms
- Fascia: A band or sheet of connective tissue beneath the skin that attaches, stabilizes, encloses, and separates muscles and other internal organs.
- Introducer Sheath: A medical device used in interventional procedures to allow the insertion of catheters, wires, or other instruments into the body.
- Scalpel Sheath: A protective cover for a scalpel to prevent accidental injury.
See Also
External links
- Medical encyclopedia article on Sheath
- Wikipedia's article - Sheath
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