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Damage to the marginal mandibular branch of the facial nerve may cause paralysis of the depressor anguli oris muscle. [1] This may contribute to an asymmetrical smile. [1] This may be corrected by resecting (cutting and removing) the depressor labii inferioris muscle, which has a more significant impact on smiling. [1]
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]
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.
Lateral pterygoid muscle; lower lip. Depressor labii inferioris muscle; angle of mouth. Depressor anguli oris muscle; nasal septum. Depressor septi nasi muscle; Eyes.
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
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]
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
The hyoglossus is a thin and quadrilateral extrinsic muscle of the tongue. It originates from the hyoid bone ; it inserts onto the side of the tongue. It is innervated by the hypoglossal nerve (cranial nerve XII) .