Embryological Development and Anatomical Structure of the Small Intestine
Diagnosis and Treatment of Gastrointestinal Cancers, NOVA Publications , ss.91-104, 2025
- Yayın Türü: Kitapta Bölüm / Araştırma Kitabı
- Basım Tarihi: 2025
- Yayınevi: NOVA Publications
- Sayfa Sayıları: ss.91-104
- Anahtar Kelimeler: anatomy, embryological development, gastrointestinal system, small intestine
- Sağlık Bilimleri Üniversitesi Adresli: Evet
Özet
The small intestine, consisting of the duodenum, jejunum, and ileum segments, forms the longest part of the gastrointestinal system. It begins its development in the intrauterine period from the foregut (anterior intestine) and midgut (middle intestine) around the 4th week and matures over time. The intestinal wall comprises four layers from the inside out: tunica mucosa, tela submucosa, tunica muscularis, and tunica serosa. Anatomically, it starts from the pylorus and ends at the ileocecal valve. While the length is greater in fresh cadavers, it ranges between 4-6 meters in living individuals. The diameter gradually decreases from proximal to distal. Within the abdomen, it is mostly located in the middle and lower quadrants. Its arterial supply primarily comes from the superior mesenteric artery, though the proximal duodenum also receives branches from the celiac trunk. Venous drainage occurs mainly via the superior mesenteric vein. Lymphatic drainage flows through lymphatic vessels and mesenteric lymph nodes to the cisterna chyli. Neurogenic innervation occurs via the vagus and splanchnic nerves.