Anatomy of the abdominal viscera: Esophagus and stomach

00:00 / 00:00

Notes

Anatomy of the abdominal viscera: Esophagus and stomach

Figure 1: Muscular layers of esophagus. A. Circular and longitudinal layers. B. Type of muscle found throughout the esophagus.
Figure 2: A. Abdominal portion of the esophagus B. Natural constrictions of the esophagus. 
Figure 3: Arterial supply of the esophagus. 
Figure 4: Venous drainage of the esophagus. 
Figure 5: Lymphatic drainage of the esophagus. 
Figure 6: Sympathetic and parasympathetic innervation of the esophagus. 
Figure 7: A. Parts of the stomach B. Muscular layers of stomach. C. Longitudinal section of stomach (anterior wall removed) revealing gastric mucosa. 
Figure 8: Arterial supply of stomach. 
Figure 9: Venous drainage of the stomach. 
Figure 10: Lymphatic drainage of the stomach. 
Figure 11: Schematic illustration of the sympathetic and parasympathetic innervation of the stomach. 
UNLABELLED

Transcript

Watch video only

Osmosis knows that anatomy can be overwhelming, but hopefully this video on the esophagus and stomach can make it a bit easier, so let's begin “digesting” this content together! The esophagus and the stomach are part of the upper digestive tract and are involved in the first phases of digestion. We are going to use the pizza we ate for dinner last night as an example to help us explore the pathway of the esophagus and stomach.

Now, let’s start with the esophagus, which is a muscular tube that carries food from the pharynx to the stomach. We can think about the esophagus as a subway that our food travels in between these two structures. After the pizza we ate has been chewed and swallowed, the muscles of the esophagus help propel the bolus towards the stomach in a wave-like motion called peristalsis.

The esophagus is made up of two muscular layers: an internal circular layer and an external longitudinal layer. In its proximal or superior third, the external layer consists of striated skeletal muscle, which is under voluntary control, while its distal or inferior third is made up of smooth muscle, which is under involuntary control.

And as you’d expect, the middle third is a transitional segment that consists of a mix of both types of muscle. The esophagus follows the curve of the vertebral column as it descends through the neck and into the mediastinum.

Once it reaches the diaphragm, it passes through the esophageal hiatus, just to the left of the median plane at the level of the T10 vertebra, where it becomes the abdominal esophagus. The abdominal esophagus finishes its journey by becoming continuous with the stomach through the cardial orifice, which is surrounded by the cardiac sphincter.

It sits left of the midline at the level of the T11 vertebra and designates the esophagogastric junction, which is an important landmark where the mucosa abruptly changes from the stratified squamous epithelium of the esophagus to the simple columnar epithelium of the stomach.

The right border of the abdominal esophagus continues with the lesser curvature of the stomach, while its left border will eventually continue with the fundus of the stomach.

Sources

  1. "Clinically Oriented Anatomy, 7e" Wolters Kluwer (2017)
  2. "Stomach" Radiopaedia (2021)
Elsevier

Copyright © 2024 Elsevier, its licensors, and contributors. All rights are reserved, including those for text and data mining, AI training, and similar technologies.

Cookies are used by this site.

USMLE® is a joint program of the Federation of State Medical Boards (FSMB) and the National Board of Medical Examiners (NBME). COMLEX-USA® is a registered trademark of The National Board of Osteopathic Medical Examiners, Inc. NCLEX-RN® is a registered trademark of the National Council of State Boards of Nursing, Inc. Test names and other trademarks are the property of the respective trademark holders. None of the trademark holders are endorsed by nor affiliated with Osmosis or this website.

RELX