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| Name | Small Intestine Anatomy (Parts, Topography, Structures, Layers) |
| Video Uploader | Video From Taim Talks Med |
| Upload Date | This Video Uploaded At 31-10-2021 06:00:12 |
| Video Discription | Content: 0:00 Introduction 0:40 Small Intestine Overview 1:14 Duodenum 3:39 Jejunum and Ileum 6:48 Anatomical Structures of the Duodenum 9:35 Anatomical Structures of Jejunum and Ileum 10:25 Layers of the Small Intestinal Wall ------------------------------- 🫀 Join: https://www.youtube.com/channel/UCEr7pkSXVsHcBLLBcJAGV-Q/join 📷 Follow my IG: https://www.instagram.com/taimtalksmed/ 💝 Donation link: https://www.buymeacoffee.com/taimtalksmed ------------------------------- Small Intestine Overview: - Small Intestine goes from the Pylorus to the Caecum - Approx 7 meters long in adults - Parts of the small intestine: Duodenum, Jejunum, Ileum Duodenum: - 20-30cm - Responsible for Iron Absorbtion, Chemical Digestion, Chemical Neutralization - Processes Chyme from the stomach Topography of the Duodenum: - Skeletopy: From L1 to L3 - Syntopy: ○ Behind Duodenum: Inferior Vena Cava, Aorta, Right Kidney ○ Above Duodenum: Liver, Pancreas ○ Anteriorly: Transverse Colon - Holotopy: Epigastric Region and Umbilical Region Jejunum and Ileum: - No strict demarcation between jejunum and ileum - Jejunum (2-3 meters long) ○ Primary Function: Absorbtion - Ileum (2-4 meters long) ○ Absorbs remaining nutrients and vitamins (vitamin b12) Topography of the Jejunum and Ileum: - Skeletopy: L2 to Right Iliac Fossa - Syntopy: ○ Surrounded by Caecum, Ascending colon, transverse colon, descending colon and sigmoid colon ○ Posteriorly: Fixated to posterior abdominal wall through the root of the mesentery (Radix Mesenterii) ○ Anteriorly: Greater Omentum - Holotopy: ○ Ileum: Umbilical and left lateral region ○ Jejunum: Left Lateral Region, Right Inguinal Region, Pubic Region Anatomical Structures: - Duodenum: ○ Superior Part § from Pyloric Orifice (Ostium Pyloricum) § To Superior Duodenal Flexure (Flexura Duodeni Superior) ○ Descending Part § From Superior Duodenal Flexure (Flexura Duodeni Superior) § To Inferior Duodenal Flexure (Flexura Duodeni Inferior) ○ Inferior Horizontal Part § From Inferior Duodenal Flexure (Flexura Duodeni Inferior) ○ Ascending Part § Until Duodenojejunal Flexure (Flexura Duodenojejunalis) / Ligament of Treitz - Jejunum: ○ Wider, Thicker than Ileum ○ More vascular ○ Darker in colour - Ileum: ○ Thinner ○ Less Vascular ○ Lighter in Colour Layers of the Small Intestinal Wall: - Tunica Mucosa ○ Made up of Simple Columnar Epithelium ○ Circular Folds (Plicae Circulare) absent in the duodenal bulb (bulbus duodeni) ○ Intestinal Villi (Villi Intestinales) ○ Microvilli ○ Intestinal Glands (Glandula Intestinales) ○ Solitary Lymphoid Nodules (Noduli Lymphoidei Solitarii) ○ Aggregated lymph nodules (Noduli Lymphoidei Aggregati) ○ AT the duodenum: § Major Duodenal Papilla (Papilla Duodeni Major) § Minor Duodenal Papilla (Papilla Duodeni Minor) - Tela Submucosa ○ Duodenum: Brunners Glands ○ Jejunum: Longer Villi ○ Ileum: More goblet cells in mucosa and has Peyers Patches (GALT) - Tunica Muscularis ○ Provides Peristaltic movement (peristalsis) ○ Inner Layer: Circular Muscle Layer § Hepatopancreatic Sphincter (Sphincter of Oddi) (M. Sphincter Ampullae Hepatopancreatica) ○ Outer Layer: Longitudinal Muscle Layer - Tunica Serosa ○ Intraperitoneal Organs (Peritoneum) ○ Retroperitoneal Organs (Duodenum) has tunica adventitia at some parts Sources used in this video: - Memorix Anatomy 2nd Edition by Hudák Radovan (Author), Kachlík David (Author), Volný Ondřej (Author) - Biorender - University notes and lectures |
| Category | Education |
| Tags | meditay | Funtion of small intestine | small intestine | small intestine function | gut | gastrointestinal | abdomen | duodenum | jejunum | ileum anatomy | jejunum anatomy | duodenum anatomy | chyme | small intestine histology | small intestine layers | peristalsis small intestine | peristalsis | sphincter of oddi | pancreatic duct | anatomy of the duodenum | structure of small intestine | small intestine anatomy | duodenal anatomy | function of small intestine | gastrointestinal system | GI tract anatomy |
