Medical Definition of TISSUE. : an aggregate of cells usually of a particular kind together with their intercellular substance that form one of the structural materials of a plant or an animal and that in animals include connective tissue, epithelium, muscle tissue, and nerve tissue.edical Definition of TISSUE. : an aggregate of cells usually of a particular kind together with their intercellular substance that form one of the structural materials of a plant or an animal and that in animals include connective tissue, epithelium, muscle tissue, and nerve tissue.
Lacerations are the blunt force injuries in which the skin and the underlying tissues are torn apart due to application of force. Characteristics. Types of Lacerations. Crushing of the skin and subcutaneous tissues between two hard objects, splits them, producing split lacerations (perpendicular impact).
These severe tears are called third-or fourth-degree lacerations. A third-degree laceration is a tear in the vaginal tissue, perineal skin, and perineal muscles that extends into the anal sphincter (the muscle that surrounds your anus). A fourth-degree tear goes through the anal sphincter and the tissue underneath it. It's also possible to tear in other places.