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  2. Depressor anguli oris muscle - Wikipedia

    en.wikipedia.org/wiki/Depressor_anguli_oris_muscle

    The depressor anguli oris arises from the lateral surface of the mandible. [1] Its fibers then converge. It is inserted by a narrow fasciculus into the angle of the mouth. [1] At its origin, it is continuous with the platysma muscle, and at its insertion with the orbicularis oris muscle and risorius muscle.

  3. Marginal mandibular branch of the facial nerve - Wikipedia

    en.wikipedia.org/wiki/Marginal_mandibular_branch...

    It passes anterior-ward deep to the platysma and depressor anguli oris muscles. It provides motor innervation to muscles of the lower lip and chin: the depressor labii inferioris muscle, depressor anguli oris muscle, and mentalis muscle. [1] It communicates with the mental branch of the inferior alveolar nerve. [citation needed]

  4. Muscles of mastication - Wikipedia

    en.wikipedia.org/wiki/Muscles_of_mastication

    The four classical muscles of mastication elevate the mandible (closing the jaw) and move it forward/backward and laterally, facilitating biting and chewing. Other muscles are responsible for opening the jaw, namely the geniohyoid , mylohyoid , and digastric muscles (the lateral pterygoid may play a role).

  5. Depressor labii inferioris muscle - Wikipedia

    en.wikipedia.org/wiki/Depressor_labii_inferioris...

    The depressor labii inferioris muscle helps to depress and everts the lower lip. [1] It is the most important of the muscles of the lower lip for this function. [1] It is an antagonist of the orbicularis oris muscle. [1] It is needed to expose the mandibular (lower) teeth during smiling. [1]

  6. Facial muscles - Wikipedia

    en.wikipedia.org/wiki/Facial_muscles

    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]

  7. List of skeletal muscles of the human body - Wikipedia

    en.wikipedia.org/wiki/List_of_skeletal_muscles...

    continuation of depressor anguli oris muscles other side of depressor anguli oris muscles facial artery: facial nerve [CNVII], mandibular branch or buccal branch depresses angle of mouth (frown) levator anguli oris: 0.6 [3] 1 levator labii superioris: head, mouth (left/right) medial part of infra-orbital margin of maxilla

  8. Buccal branches of the facial nerve - Wikipedia

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

    Muscle Action Risorius: Smirk Buccinator: Aids chewing by holding cheeks flat Levator labii superioris: Elevates upper lip Levator labii superioris alaeque nasi muscle: Snarl Levator anguli oris: Soft smile Nasalis: Flare nostrils Orbicularis oris muscle: Purse Lips Depressor septi nasi: Depresses nasal septum Procerus: Moves skin of forehead

  9. Mental nerve - Wikipedia

    en.wikipedia.org/wiki/Mental_nerve

    This is a branch of the mandibular nerve (CN V 3), itself a branch of the trigeminal nerve (CN V). [1] It emerges from the mental foramen in the mandible. [2] It divides into three branches beneath the depressor anguli oris muscle. One branch descends to the skin of the chin. Two branches ascend to the skin and mucous membrane of the lower lip.