Platysma

Description

Across the anterior and lateral cervical region, the platysma is presented as a thin, broad sheet in the superficial fascia, draping inferiorly from the lower border of the mandible toward the clavicles and upper thoracic wall. Deep to it, the paired sternocleidomastoid muscles stand out as oblique columns running inferomedially from the mastoid process to the manubrium and medial clavicle, defining the lateral contour of the neck. Superiorly, the skull base, mandible, dentition, and nasal cavity provide bony context, while the midline laryngeal cartilages sit anterior to the cervical vertebrae. Superficial anatomy, clearly organized. Platysma matters because it is the first named muscle encountered in anterior neck dissection and in many surgical planes, and its fibers often complicate skin-flap elevation and closure in submandibular and anterior cervical approaches. Its relationship to the mandible and to the anterior border of sternocleidomastoid helps orient the clinician when planning incisions for procedures such as tracheostomy, thyroidectomy exposure, or submental and facelift dissections, where preservation of the cervical branch of the facial nerve and management of platysmal bands are practical concerns. In neck trauma, understanding this superficial layer also ties directly to evaluation of penetrating injuries that violate the platysma. Use this artwork in gross anatomy and head and neck modules to teach superficial cervical layers, surface landmarks, and the transition from the submandibular region to the anterior neck. It also fits operative anatomy chapters, ENT and plastic surgery teaching files, and patient-facing surgical consent materials where clear depiction of the platysma and sternocleidomastoid improves communication about incision placement and postoperative contour changes. Anatomical accuracy verified by SciePro's Medical Advisory Board.