- May 6, 2026The labial part constitutes the main body of the orbicularis oris, responsible for lip closure and compression. It receives contributions…
- May 6, 2026Levator labii superioris is a thin muscle that inserts into both skin and the upper lip proper. It is the…
- May 6, 2026The depressor labii inferioris is innervated by the marginal mandibular branch of the facial nerve, making it one of the…
- May 6, 2026The frontalis is the only muscle that elevates the brow. Unlike most facial muscles, it inserts into skin rather than…
- May 6, 2026The orbital part forms the outer elliptical band responsible for forced eye closure. Unlike the palpebral part (gentle closure), it…
- May 6, 2026The lacrimal part (Horner's muscle) wraps around the lacrimal canaliculi and sac, creating a pumping action during blinking that propels…
- May 6, 2026Zygomaticus major is the primary smile muscle. Its oblique direction from the zygomatic arch to the modiolus creates the nasolabial…
- May 6, 2026The buccinator forms the muscular cheek wall. The parotid duct pierces the buccinator to enter the oral cavity opposite the…
- May 6, 2026Spinalis capitis is the cranial extension of the spinalis column, often blending with semispinalis capitis. It is inconstant in its…
- May 2, 2026The posterior auricular vein drains the posterior auricle and the retroauricular scalp, descending posterior to the ear to join the…