Tänie (anatomy)

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As taenia (of lat. Taenia ) or tape strips which in some refers to mammals reinforcements occurring the longitudinal muscle layer ( stratum longitudinal ) of the wall of the colon . Tänien are either clearly visible as free tänia ( Taenia libera ), or covered by the attachment of serosa duplicates ( Taenia obtecta ). The tänien divide the bulges of the large intestine wall formed by the ring folds (lat. Plicae semilunares caeci or coli , literally: "crescent-shaped folds of the caecum or colon"), the so-called Poschen ( haustra ), into individual rows of Poschen . The number of Poschenreihen corresponds to the number of Tänien.

Tänien occur on the appendix ( Taeniae caeci ) and colon ( Taeniae coli ) in humans, horses , pigs , rabbits and relatives of guinea pigs .

function

The covered areas serve as a starting point for mesenteries . In addition, tänien are stabilizing elements of the intestinal wall and support the intestinal peristalsis .

Tänien in humans

The human large intestine generally has three tänien, the Taenia libera , the Taenia mesocolica ( fused with the mesocolon transversum ) and the Taenia omentalis ( fused with the lower serosal duplication of the large network ).

The Taenia libera has special significance in surgery because of their proximal end of the appendix ( vermiform appendix can be found). Taenia libera guides the surgeon in the search for the appendage during an appendectomy .

Tänien of the horse

The horse's appendix has four tänien. The hip-cecum-fold ( Plica ileocaecalis ), which is important for locating the hip ( ileum ), attaches to the back tänia (Taenia dorsalis) . The lateral tänie ( Taenia lateralis ) is used to insert the cecum-colon ligament ( ligamentum caecocolicum ), the other two are free tänien. Only the back and the inside ( Taenia medialis ) reach to the apex of the appendix.

The horse's colon has regionally different numbers of tänien. The initial section, the abdominal layers of the ascending colon ( ascending colon ), also has four tänia up to the pelvic flexure ( flexura pelvina ), with the dorsolateral and medial sections serving as the base of the colon and therefore called the taenia mesocolica lateralis and medialis . The pelvic flexure and the upper left longitudinal position ( Colon dorsale sinistrum ) of the ascending colon have only one tänie, which serve as an attachment to the intercapital ligament ( ligamentum intercolicum ) to connect with the abdominal left appendix position. The upper right longitudinal position ( colon dorsale dextrum ) of the ascending colon has three tänien. The transverse colon ( transverse colon ) and the descending colon ( descending colon ) have two broad tänien, one of which is used for the insertion of the colon ( descending mesocolon ) and the opposite is free.

Remaining mammals

Tänien of the pig

The pigs' appendix has three strips of tape. The ascending colon ( colon ascendens ) is rolled up in pigs in the form of a cone. Its outer centripetal coils ( gyri centripetales ) running to the cone point have two strips of tape, whereas the thinner inner centrifugal coils of the colon no longer have any.

Tänien the hare-like

The spirally rolled up appendix of the rabbit-like has poses, but no stripes. The ascending colon ( ascending colon ), on the other hand, has two strong tänia, which gradually elapse in the posterior section until the transition into the transverse colon.

literature

  • H. Lippert: Textbook of anatomy . Urban & Fischer-Verlag, 5th edition, 2000, ISBN 3-437-42360-6
  • Salomon, F.-V. ua (Hrsg.): Anatomie für die Tiermedizin . Enke-Verlag, Stuttgart 2004, ISBN 3-8304-1007-7