• Peyer's
  • While the length of the entire intestinal tract contains lymphoid tissue, only the ileum has abundant Peyer's patches, which are unencapsulated lymphoid nodules that contain large numbers of lymphocytes and immune cells, like microfold cells. (wikipedia.org)
  • An underlying lamina propria composed of loose connective tissue and containing germinal centers and large aggregates of lymphoid tissue called Peyer's patches, which are a distinctive feature of the ileum. (wikipedia.org)
  • Cross section of ileum with a Peyer's patch circled. (wikipedia.org)
  • arches
  • In the short, upper part of the mesentery only one set of arches exists, but as the depth of the mesentery increases, second, third, fourth, or even fifth groups are developed. (wikipedia.org)
  • Lesser
  • The lesser omentum is also technically a mesentery, and any consideration of tumors of these structures is generally inclusive of lesions of the greater omentum as well. (medscape.com)