Caecum and Vermiform Appendix | Western Sydney University - Edubirdie

University:
Western Sydney University
Course:
MEDI 2003 | Clinical Sciences 2
Academic year:

2024
Views:

239

Pages:

2
Author:

Mariam A. A.

Caecum and vermiform appendix • Position and other important information - Caecum First part of the colon Intraperitoneal Begins caudally from the ileocecal valve and ending the right iliac fossa It lies in the iliac fossa of the right lower quadrant of the abdomen, inferior to the junction of the terminal ileum and cecum Vermiform appendix ✓ Attached dorsomedial to the end of the caecum ✓ In contrast to the cecum and the rest of the colon, the appendix lacks taeniae, haustra, semilunar folds and appendices epiploic. ✓ Position is usually variable but retrocecal. ✓ ✓ ✓ ✓ - • Variations - • taenia coli - • Caecum: ileocolic artery Appendix: ileocolic artery -> appendicular artery Venous drainage - • Mesoappendix ✓ Short triangular mesentery ✓ Derives from the posterior side of the appendix Blood supply - • Between ileum and cecum Prevents reflux of large bowel contents into the ileum during peristalsis Peritoneal attachment - • Longitudinal bands of smooth muscle on the outer surface of the colon Mesocolic Teniae: present on surface caecum, ascending, descending and sigmoid colon, but is placed posteriorly on transverse colon at the site of attachment of transverse mesocolon Omental Teniae: the anterior and the largest, corresponds along the arch of the colon to the attachment of the greater omentum Free Teniae: not attached to anything Ileocecal valve - • mobile, free, fixed cecum Caecum: ileocolic vein Appendix: appendicular vein -> ileocolic vein Lymphatic drainage • lymph nodes in the meso-appendix -> ileocolic lymph nodes that lie along the ileocolic artery -> efferent lymphatic vessels -> superior mesenteric lymph nodes Innervation - Sympathetic: superior mesenteric plexus originating from the lower thoracic part Parasympathetic: vagus nerve

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