Platysma muscle
Imaging of
the sublingual and submandibular spaces. Anatomy of the submandibular and sublingual spaces in the coronal plane: picture illustration and T2-weighted MR image
Platysma muscle is a broad superficial fascial sheet of thin muscle covering the superior anterior chest, anterior and anterolateral neck and anterolateral mandibular region.
Gross anatomy
The muscle consists of three parts: pars mandibularis, pars labialis and pars modiolaris.
- origin: the fascia of pectoralis major and deltoid muscles
- insertion: lower border of the mandible, the lower lip, and subcutaneous tissue of the lower face
Actions
- tenses the skin between the jaw and lateral neck
- assists in lowering the mandible
Arterial supply
- submental branch of the facial artery: commonest
- suprascapular artery
Venous drainage
- anteriorly: small venous tributaries, often via the submental vein, drain into the superior thyroid vein, anterior jugular vein, or facial vein of the internal jugular vein system
- posteriorly: external jugular vein
Innervation
- cervical branch of the facial nerve
