Facial Anatomy by Layer

[Intro] Nobody cuts through what they can't name Between the skin and the bone there's more than you'd think Wrong layer and you're somewhere you didn't mean to be [Verse 1] Skin sits first, the barrier you can see Subcutaneous fat comes next, in compartments Fascia and the SMAS organize the tissue Muscles of expression insert into skin Nerves and vessels run beneath all that Periosteum and bone hold up the rest [Pre-Chorus] Trigeminal carries sensation, facial carries movement One lets you feel it, one lets you show it Cut the facial nerve and expression stops Don't swap those two, it costs points every time [Chorus] Six layers from the skin down to the bone Skin, then fat, then fascia and SMAS Muscle, then nerves and vessels, then bone Superficial down to deep, in that order Five senses it, seven moves it Six layers building your face [Verse 2] SMAS runs down and becomes the platysma Runs up and becomes the galea aponeurotica Muscles of expression end inside the skin Muscles of mastication end on bone Facial nerve cuts straight through the parotid Facial artery branches off the external carotid [Bridge] Trigeminal splits into three divisions Ophthalmic, maxillary, mandibular Only the mandibular carries motor fibers And those run mastication, never expression [Chorus] Six layers from the skin down to the bone Skin, then fat, then fascia and SMAS Muscle, then nerves and vessels, then bone Superficial down to deep, in that order Five senses it, seven moves it Six layers building your face [Outro] Six floors from the skin to the bone Expression inserts in skin, mastication on bone Cranial seven moves, cranial five feels Wrong layer, wrong plane, every time [End]