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  2. Facial muscles - Wikipedia

    en.wikipedia.org/wiki/Facial_muscles

    An inability to form facial expressions on one side of the face may be the first sign of damage to the nerve of these muscles. Damage to the facial nerve results in facial paralysis of the muscles of facial expression on the involved side. Paralysis is the loss of voluntary muscle action; the facial nerve has become damaged permanently or ...

  3. Facial expression - Wikipedia

    en.wikipedia.org/wiki/Facial_expression

    Facial expression is the motion and positioning of the muscles beneath the skin of the face. These movements convey the emotional state of an individual to observers and are a form of nonverbal communication.

  4. Facial Action Coding System - Wikipedia

    en.wikipedia.org/wiki/Facial_Action_Coding_System

    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]

  5. Buccal branches of the facial nerve - Wikipedia

    en.wikipedia.org/wiki/Buccal_branches_of_the...

    The superficial branches run beneath the skin and above the superficial muscles of the face, which they supply: some are distributed to the procerus, joining at the medial angle of the orbit with the infratrochlear and nasociliary branches of the ophthalmic.

  6. Frown - Wikipedia

    en.wikipedia.org/wiki/Frown

    Illustration of facial muscles and other tissue of the lateral human head and neck. It is a long-held belief that it takes more muscles to frown than it does to smile. [16] It is difficult to determine exactly how many muscles are involved in smiling or frowning as there is a wide range of facial expressions that might be considered a frown or ...

  7. Mécanisme de la physionomie humaine - Wikipedia

    en.wikipedia.org/wiki/Mécanisme_de_la...

    He also isolates the precise contractions that result in each expression and separates them into two categories: partial and combined. To stimulate the facial muscles and capture these "idealized" expressions of his patients, Duchenne applied faradic shock through electrified metal probes pressed upon the surface of the various muscles of the face.

  8. Modiolus (face) - Wikipedia

    en.wikipedia.org/wiki/Modiolus_(face)

    It is contributed to by at least nine muscles: orbicularis oris, buccinator, levator anguli oris, depressor anguli oris, zygomaticus major, zygomaticus minor, risorius, quadratus labii superioris, quadratus labii inferioris. [1] [2] Its position and movements are important in moving the mouth, facial expression and in prosthetic dentistry. It ...

  9. Superficial muscular aponeurotic system - Wikipedia

    en.wikipedia.org/wiki/Superficial_muscular_apo...

    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]