The document summarizes the anatomy of the neck. It describes six layers of the deep cervical fascia: 1) investing layer, 2) pretracheal fascia, 3) prevertebral fascia, 4) carotid sheath, 5) buccopharyngeal fascia, and 6) pharyngobasilar fascia. It then provides more detail on the investing layer, pretracheal fascia, and carotid sheath, including their attachments, contents, and surrounding structures.