The posterior division of the suboccipital, and the medial branches of the posterior division of the second and third cervical nerves are sometimes joined by communicating loops to form the posterior cervical plexus.
12.
Near the sternum, they cross in front of the internal mammary artery and Transversus thoracis muscle, pierce the Intercostales interni, the anterior intercostal membranes, and Pectoralis major, and supply the integument of the front of the thorax and over the mamma, forming the anterior cutaneous branches of the thorax; the branch from the second nerve unites with the anterior supraclavicular nerves of the cervical plexus.
13.
This removes lymph tissue contained in regions I-III . The posterior limit of the dissection is marked by the cutaneous branches of the cervical plexus and the posterior border of the SCM . The inferior limit is the superior belly of the omohyoid muscle where it crosses the IJV . The second subtype, posterolateral neck dissection, refers to the removal of the suboccipital lymph nodes, retroauricular lymph nodes, levels II-IV, and level V . This procedure is used most often to remove nodal disease from cutaneous melanoma of the posterior scalp and neck . 4 Originally described by Rochlin in 1962, the SAN, SCM, and IJV were preserved.
