Posterior triangle of the neck which divides the space into two triangles: A) Nerves and plexuses: B) Vessels: C) Lymph nodes: D) Muscles: The accessory nerve (CN XI) is particularly vulnerable to damage during lymph node biopsy. Damage results in an inability to shrug the shoulders or raise the arm above the head, particularly due to compromised trapezius muscle innervation. The Internal jugular vein's superficial location within the posterior triangle also makes it vulnerable to injury. Posterior triangle of the neck The posterior triangle (or lateral cervical region) is a region of the neck. It has the following boundaries: Apex: Union of the sternocleidomastoid and
Head and Neck Cancer Alliance and other related functions. The Head and Neck Cancer Alliance has also developed a free app on iTunes to assist people with screening themselves for head and neck cancer; the app is available at https://itunes.apple.com/us/app/head-and-neck-check/id784226942?mt=8. It was found that awareness about oral cancer among patients in Jordan is low. These patients, especially those in high-risk groups for mouth cancer and those of lower socio-economic status, are less well informed about the signs and risk factors of oral cancer. Interventions to improve public knowledge about oral cancer and attitudes towards early diagnosis and treatment are urgently indicated. Head and Neck Cancer