Small Intestine Anatomy (Parts, Topography, Structures, Layers)
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- Опубликовано: 2 июл 2024
- Content:
Introduction 0:00
Small Intestine Overview: 00:40
Duodenum: 01:14
Jejunum and Ileum: 03:39
Anatomical Structures of the Duodenum: 6:48
Anatomical Structures of Jejunum and Ileum: 9:35
Layers of the Small Intestinal Wall: 10:25
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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
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thank u sooooooooooooooo much🥰🥰🥰🥰 I cannot be more grateful .Besides, literally you made me skip all the lectures and classes of Anatomy with there boring DRs LOL😂😂😂😂🤭🤭🤭🤭
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I appreciate the research and information you provided in this video. It's enlightening and thought-provoking. Thanks for sharing!
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Thanks! Really good and informative video
Superb illustration! Can you please include vasculatures and applied anatomy of the organs in subsequent videos. Thank you 😊
Very nice video, I always do find your videos super easy to understand, but it would me nice if you add the arterial blood supply and venous drainage, thanks
Glad to hear! I've had to separate them to not make the video too long! But I might make a summary video of each organ in the future =)
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Thanks for great and easy explanation
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You're welcome! Glad you found it helpful =)
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It will be much clearer if these are not posters and drawings, but the processing of a CT examination of a specific person. Moreover, such opportunities have already existed for a long time.
The picture of the tunica muscularis at 17:15 is a bit misleading - it shows the longitudinal muscle layer as being the inner one and not the circular :) The circles represent the longitudinal as they run along the lenght of the intestine. ps:Amazing video!
Nice
I Thank you 😊
Glad you found it helpful! 😄
Good
thanks sir this is helpful
Wanderfull
cool
Hi, which 3D program do you use?
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Sir Jis tarah Brain neurons cell Se Milkar bana hai, Usi tarah Yeh Jo Alimantry Canal hai wo kis Cell se milkar bana hai, Pure Alimantry canal ka Functional Unit kya hai??
if you been diagnosed with smas and had it repaired, will you assume you will be normal again?
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Tbe info is. Very interest8ng .... but speed and language used is not ok for non-medicine students
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One year ago, on May 7, 2024, I was vomiting and when I went to the clinic, I was told that I had extra bowel Ye threat does he have
Hello my dear friends! Do you know where I can find the text of this video!?
I've written a summary text in the description :)
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Please cover the overview first without going into too much detailed that are not v useful . I appreciate
But we need the details
Thanks
Thanks