![]() The sensory component of the lower lip connects to the trigeminal’s mandibular branch and travels through the mental foramen to the brainstem.( 6) The motor nerves serving the lips come from “cranial nerve VII,” the “facial nerve.” They arise from the mandibular branch of the nerve. The “buccinator,” “levator anguli oris,” and “mentalis”-deeper musculature elements-are served by cranial nerve V, the “trigeminal.” ( 5) The nerves innervate muscles and verify what is happening via afferent feedback. The nervous system consists of efferent nerves from the brain and afferent nerves to the brain. ![]() The nervous system’s “subdermal plexus” receives its blood supply from both the facial and labial arteries.( 4) The upper and lower lips receive blood supply via the “external carotid’s” “ facial artery.” It proceeds from the neck, supplying the “inferior and superior labial artery” lying beneath the orbicularis oris. “Salivary glands,” “sebaceous glands,” and various hair cells reside within these lip tissues.( 3) The vermilion is nurtured via capillaries. The “ orbicularis oris” is the muscle of both the upper and lower lips, nurtured by the “superior and inferior labial arteries.” ![]() These surface structures cover the musculature of the lips. The lower lip is recognized by its vermilion edge as well, but the only definition to the lower lip is the “ mentolabial sulcus,” a slight depression of chin skin below the vermilion.( 2) The vermilion is the connecting tissue linking our exterior skin to the interior mucosa and the moisture of the mouth. These structures connect to our “lips,” the “vermilion” where lipstick or lip balm is applied. The upper lip has flesh (the “pillars”) that rises above the other lip tissue (the “philtrum”). Our discussion here focuses on the significance of lower lip myoclonus.Ī casual look at the face reveals several surface structures that comprise our lips. This condition is called “ myoclonus,” not a disease per se, but a possible disease indicator.( 1) Although discomfort may be present, it may be invisible to others.
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