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The muscular layer is a region of muscle in many organs in the vertebrate body, including the heart and the gut. The heart walls consist of three layers: the internal or endocardium, the middle or myocardium and the external or pericardium. The myocardium is the thickest of the three tunics and is composed of cardiac muscle tissue. The muscularis propria is the thickest part of the gut wall and is composed of bundles of smooth muscle cells with a spiral orientation forming two distinct layers: the inner layer with a more circular orientation and the outer layer with a more longitudinal orientation.
| Characteristics | Values |
|---|---|
| Name | Muscular layer, muscular coat, muscular fibres, muscularis propria, muscularis externa, tunica muscularis |
| Location | Many organs in the vertebrate body, adjacent to the submucosa |
| Function | Responsible for gut movement such as peristalsis |
| Composition | Bundles of smooth muscle cells with a spiral orientation forming two distinct layers: the inner layer with a more circular orientation and the outer layer with a more longitudinal orientation |
| Vascularisation | Richly vascularised |
| Innervation | Richly innervated |
| Nerve branches | Arise from the two plexus in the gut wall: the myenteric (also called Auerbach) plexus situated between the two muscle layers and the submucosal (also called Meissner) plexus |
| Exceptions | In the stomach, there are three layers to the muscular layer, with an additional oblique muscle layer just interior to the circular muscle layer. In the upper oesophagus, part of the externa is skeletal muscle, rather than smooth muscle. In the vas deferens of the spermatic cord, there are three layers: inner longitudinal, middle circular, and outer longitudinal |
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What You'll Learn
- The thickest part of the gut wall is the muscularis propria, which is composed of bundles of smooth muscle cells with a spiral orientation
- The myocardium is the thickest of the three tunics of the heart
- The muscularis layer is composed of a helically oriented outer longitudinal layer, a medial thick circular layer and an inner longitudinal layer
- The muscularis mucosae is a thin layer of smooth muscle that separates the mucosa from the submucosa
- The muscularis externa is a region of muscle in many organs in the vertebrate body
The thickest part of the gut wall is the muscularis propria, which is composed of bundles of smooth muscle cells with a spiral orientation
The muscular layer is a region of muscle in many organs in the vertebrate body, adjacent to the submucosa. The muscularis propria is the thickest part of the gut wall and is composed of bundles of smooth muscle cells with a spiral orientation, forming two distinct layers: the inner layer with a more circular orientation and the outer layer with a more longitudinal orientation. The muscularis is richly vascularised and innervated. The nerve branches arise from the two plexus in the gut wall: the myenteric (also called Auerbach) plexus situated between the two muscle layers and the submucosal (also called Meissner) plexus. The major functions of the muscularis propria are to propel food through the gut by contractile peristaltic waves initiated and regulated by various neural and hormonal events. Flow is regulated by peristaltic mechanisms and by sphincters located in the upper oesophagus, in the distal portions of the oesophagus, stomach, and ileum and in the anus.
The muscularis of the stomach is thicker than that elsewhere, with the muscle fibres layered in more orientations. In the stomach, there are three layers to the muscular layer. The stomach contains an additional oblique muscle layer just interior to the circular muscle layer. In the upper oesophagus, part of the externa is skeletal muscle, rather than smooth muscle. In the vas deferens of the spermatic cord, there are three layers: inner longitudinal, middle circular, and outer longitudinal.
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The myocardium is the thickest of the three tunics of the heart
The myocardium is the thickest of the three tunics or layers of the heart. The other two layers are the internal or endocardium and the external or pericardium. The endocardium is a single layer of squamous endothelial cells resting on a thin layer of loose connective tissue. The pericardium is a serous membrane in which the heart lies.
The myocardium is the middle layer of the heart and is composed of cardiac muscle tissue. It is the thickest layer of the heart and lies between the single-cell endocardium layer and the outer epicardium. The myocardium is functionally the main constituent of the heart and enables heart contractions. It is composed of specialised muscle cells called cardiomyocytes, which have unique cellular features that correlate to their contractile function. Cardiomyocytes have a single nucleus in the centre of the cell, which helps to distinguish them from skeletal muscle cells that have multiple nuclei dispersed in the periphery of the cell. Cardiomyocytes are also very rich in glycogen deposits and mitochondria, which is significant as the myocardium is constantly contracting and needs a great amount of energy at all times.
The muscular layer is a region of muscle in many organs in the vertebrate body, adjacent to the submucosa. In the stomach, there are three layers to the muscular layer. The muscularis propria is the thickest part of the gut wall and is composed of bundles of smooth muscle cells with a spiral orientation forming two distinct layers: the inner layer with a more circular orientation and the outer layer with a more longitudinal orientation.
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The muscularis layer is composed of a helically oriented outer longitudinal layer, a medial thick circular layer and an inner longitudinal layer
The muscularis layer is composed of three layers: an outer longitudinal layer, a thick circular layer and an inner longitudinal layer. The outer longitudinal layer is helically oriented, while the inner longitudinal layer is more circular. The thickest muscularis layer is found in the stomach, where it has three layers.
The muscularis layer is also known as the muscularis externa and is responsible for gut movement, such as peristalsis. The coordinated contractions of the inner and outer layers propel food through the gastrointestinal tract. The inner layer also forms a sphincter at two locations in the gastrointestinal tract: the pylorus of the stomach and the anal canal.
The muscularis layer is the thickest part of the gut wall and is composed of bundles of smooth muscle cells with a spiral orientation. The nerve branches that control peristalsis arise from the two plexus in the gut wall: the myenteric (or Auerbach) plexus, which is situated between the two muscle layers, and the submucosal (or Meissner) plexus.
In the heart, the thickest layer of muscle is called the myocardium. It is one of three tunics or layers that make up the heart walls: the internal or endocardium, the middle or myocardium and the external or pericardium.
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The muscularis mucosae is a thin layer of smooth muscle that separates the mucosa from the submucosa
The muscularis mucosae is not the only muscular layer in the body. The myocardium, for example, is the thickest of the three tunics that make up the heart walls. It consists of cardiac muscle tissue. The visceral layer of the pericardium corresponds to the epicardium, which covers the heart externally.
In the stomach, there are three layers to the muscular layer. There is an additional oblique muscle layer just interior to the circular muscle layer. In the upper oesophagus, part of the externa is skeletal muscle, rather than smooth muscle. In the vas deferens of the spermatic cord, there are three layers: inner longitudinal, middle circular, and outer longitudinal.
The muscularis layer is composed of a helically oriented outer longitudinal layer, a medial thick circular layer, and an inner longitudinal layer.
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The muscularis externa is a region of muscle in many organs in the vertebrate body
The muscularis layer is also known as the muscular coat, muscular fibres, muscularis propria and muscularis externa. The Latin, tunica muscularis, may also be used.
The muscularis propria is the thickest part of the gut wall and is composed of bundles of smooth muscle cells with a spiral orientation forming two distinct layers: the inner layer with a more circular orientation and the outer layer with a more longitudinal orientation.
The myocardium is the thickest of the three tunics of the heart walls. It consists of cardiac muscle tissue.
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Frequently asked questions
The thickest muscularis layer is found in the stomach.
The myocardium is the thickest layer of the heart.
The tunica media is the thickest layer of an artery.
