Mastoid: There tend to be 2 mastoid lymph nodes, which are also called the submit-auricular lymph nodes. They can be found posterior into the ear and lie around the insertion on the sternocleidomastoid muscle in to the mastoid process. Lymphatic vessels acquire from lymph sacs that arise from establishing veins, https://knoxdoyhn.blogdun.com/30993992/not-known-details-about-lymph-drainage