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Muscles of head and neck. The Facial Action Coding System (FACS) is a system to taxonomize human facial movements by their appearance on the face, based on a system originally developed by a Swedish anatomist named Carl-Herman Hjortsjö. [1]
The facial muscles are just under the skin (subcutaneous) muscles that control facial expression. They generally originate from the surface of the skull bone (rarely the fascia), and insert on the skin of the face. When they contract, the skin moves. These muscles also cause wrinkles at right angles to the muscles’ action line. [2]
Print/export Download as PDF; Printable version; In other projects ... Help. Pages in category "Facial muscles" The following 13 pages are in this category, out of 13 ...
There are no precise histological boundaries because the modiolus is an irregular zone where dense, compact, interlacing tissue grades into the stems of individually recognizable muscles. It is contributed to by at least nine muscles: orbicularis oris , buccinator , levator anguli oris , depressor anguli oris , zygomaticus major , zygomaticus ...
It inserts in the fascia of the facial muscles and in the skin above the eyes and nose. [2] Some sources consider the occipital and frontal bellies to be two distinct muscles. However, Terminologia Anatomica currently classifies it as a single muscle, and also includes the temporoparietalis muscle as part of the epicranius.
The transversus menti, or transverse muscle of the chin, is a facial muscle that is often considered to be the superficial fibers of the depressor anguli oris muscle which cross to the other side of the face. [1]
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Anteromedially, it blends with the epimysium of some facial muscles; [3] a link between facial muscles and the skin of the face is thereby established, enabling facial expression. [2]: 429 Over the parotid gland, the SMAS is firmly united with the superficial layer of parotid fascia. [4]