[Solved] If Brad masturbates alone, it is considered _______, but if he and Devon manually stimulate each other, it is considered _______. A) tribadism; an autoerotic behavior B) outercourse; tribadism C) an autoerotic behavior; mutual masturbation D) mutual masturbation; tribadism E) outercourse; an autoerotic behavior Popliteal Region: The area behind the knee where the thigh and calf meet, containing nerves, blood vessels, and muscles. Cervical Region: Refers to the neck portion of the spine, comprising seven vertebrae that support the head and allow for its movement. Medullary Cord: Part of the lymph node's internal structure composed primarily of B lymphocytes and plasma cells. Medullary Sinus: The spaces within the lymph node that carry lymphatic fluid and white blood cells through the node.