RT Book, Section A1 Sonne, James W.H. SR Print(0) ID 1174512232 T1 Head and Neck T2 Photographic Dissector for Students of Physical Therapy: A Step-by-Step Approach YR 2020 FD 2020 PB McGraw-Hill Education PP New York, NY SN 9781260457933 LK accessphysiotherapy.mhmedical.com/content.aspx?aid=1174512232 RD 2024/04/18 AB The posterior triangle of the neck contains many important landmarks and nervous structures, some of which were already identified in past dissections but which we will now locate as they travel within the neck. But first, there are superficial structures that will need to be identified. The platysma is a thin sheet of skeletal muscle that is invested with the superficial fascia across the anterior and lateral neck. Be cautious when using a scalpel not to miss this muscle of facial expression. Posterior to the sternocleidomastoid, emerging collectively at a landmark called Erb's Point, are a collection of sensory nerves for the neck that are part of the cervical plexus. After locating these structures move deeper to find the scalenes and the trunks of the brachial plexus.