In human anatomy, the orbicularis oris muscle is the sphincter muscle around the mouth. the source or beginning of anything, especially the more fixed end or attachment of a muscle (as distinguished from its insertion), or the site of emergence of a … The pelvis is inferior to the abdomen. Notice that the term “brachium” or “arm” is reserved for the “upper arm” and “antebrachium” or “forearm” is used rather than “lower arm.” Similarly, “femur” or “thigh” is correct, and “leg” or “crus” is reserved for the portion of the lower limb between the knee and the ankle. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! What made you want to look up orbicularis? By the end of this section, you will be able to: Anatomists and health care providers use terminology that can be bewildering to the uninitiated; however, the purpose of this language is not to confuse, but rather to increase precision and reduce medical errors. If the body were supine or prone, the MRI scanner would move from top to bottom to produce frontal sections, which would divide the body into anterior and posterior portions, as in “cutting” a deck of cards. A standard reference position for mapping the body’s structures is the normal anatomical position. Lateral describes the side or direction toward the side of the body. BabyCenter is committed to providing the most helpful and trustworthy pregnancy and parenting information in the world. Again, if the body were supine or prone, to produce sagittal sections, the scanner would move from left to right or from right to left to divide the body lengthwise into left and right portions. In this lesson, learn the definition, innervation, and function of the orbicularis oris muscle. Inferior (or caudal) describes a position below or lower than another part of the body proper; near or toward the tail (in humans, the coccyx, or lowest part of the spinal column). risorius: [TA] facial muscle of mouth; origin , from platysma and fascia of masseter; insertion , orbicularis oris and skin at corner of mouth; action , draws angle of mouth laterally, lenghthening rima oris; nerve supply , facial. In which direction would an MRI scanner move to produce sequential images of the body in the frontal plane, and in which direction would an MRI scanner move to produce sequential images of the body in the sagittal plane? Delivered to your inbox! For example, you might say a scar “on the anterior antebrachium 3 inches proximal to the carpus”. To further increase precision, anatomists standardize the way in which they view the body. For questions regarding business inquiries. 'All Intensive Purposes' or 'All Intents and Purposes'? The orbicularis oris is the muscle that surrounds the mouth and forms the lips. For instance, an anatomist might describe one band of tissue as “inferior to” another or a physician might describe a tumor as “superficial to” a deeper body structure. Although no membrane physically divides the abdominopelvic cavity, it can be useful to distinguish between the abdominal cavity, (the division that houses the digestive organs), and the pelvic cavity, (the division that houses the organs of reproduction). There are nine resulting regions. 'Nip it in the butt' or 'Nip it in the bud'? You will be able to describe the body’s regions using the terms from the figure. In human anatomy, the orbicularis oris muscle is a complex of muscles in the lips that encircles the mouth.It is a sphincter, or circular muscle, but it is actually composed of four independent quadrants that interlace and give only an appearance of circularity.. Medical definition of orbicularis: a muscle encircling an orifice. The circular fibers composing the labial part of the orbicularis oris run between the angles of the mouth, having the origin and insertion site within the skin of the corners of the mouth. The Tissue Level of Organization, 4.3 Connective Tissue Supports and Protects, 5.3 Functions of the Integumentary System, 5.4 Diseases, Disorders, and Injuries of the Integumentary System, Chapter 6. There are three planes commonly referred to in anatomy and medicine, as illustrated in Figure 1.4.3. Regions of the body are identified using terms such as “occipital” that are more precise than common words and phrases such as “the back of the head.” Directional terms such as anterior and posterior are essential for accurately describing the relative locations of body structures. Body sections and scans can be correctly interpreted, only if the viewer understands the plane along which the section was made. Post the Definition of orbicularis to Facebook, Share the Definition of orbicularis on Twitter, On ‘Corps’ and ‘Core’ and ‘Corp’ (and ‘Corpse’). Build a city of skyscrapers—one synonym at a time. For example, a scar in the “anterior (front) carpal (wrist) region” would be present on the palm side of the wrist. Images of the body’s interior commonly align along one of three planes: the sagittal, frontal, or transverse.
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