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
Off-the-Neck Historic District Off-the-Neck Historic District The Off-the-Neck Historic District encompasses a well-preserved set of early 19th-century rural properties on Maine State Route 166 (SR 166) in Castine, Maine, as well as canal dug in 1779 by British forces during the American Revolutionary War across the neck separating the Bagaduce Peninsula (where the main village of Castine is located) from the mainland. The district takes its name from the fact that the included properties are just north of this neck on the mainland. The district was listed on the National Register of Historic Places in 1986. Maine State Route 166 (SR 166) is