Platysma M. Cutaneous Nn . Supplies the skin of scalp behind and above ear. Vv ends in subclavian Suprascapular V. Travels superior to superior transverse scapular ligament with suprascap. A Transverse cervical V. . Starts near the hyoid by the fusion of small Vv from submental and submandibular regions.
Superior belly is located in the anterior triangle.
Motor fibers derived from C1-C5. N. Together the CN XI passes through the jugular foramen. The spinal portion supplies the motor innervation to the sternoscleidomastoid and trapezius Mm. Formed by ventral rami of C5-T1. Each trunk then splits into an anterior and posterior division, there are thus 3 anterior and 3 posterior divisions.