| Crus of diaphragm | |
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| The diaphragm. For other types of diaphragm see Diaphragm. In the Anatomy of Mammals the thoracic diaphragm is a sheet of Muscle Under surface. (Left crus and right crus are at bottom center. ) | |
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| Deep and superficial dissection of the lumbar plexus. The lumbar plexus is a Nervous plexus in the Lumbar region of the body (Rt. crus of diaph. labeled vertically at center. ) | |
| Latin | crus sinistrum diaphragmatis, crus dextrum diaphragmatis |
| Gray's | subject #117 405 |
The crura of the diaphragm (singular=crus) are tendinous structures that extend downward from the diaphragm to attach to the vertebral column. Latin ( lingua Latīna, laˈtiːna is an Italic language, historically spoken in Latium and Ancient Rome. A tendon (or sinew) is a tough band of Fibrous connective tissue that usually connects Muscle to Bone and is capable of withstanding tension For other types of diaphragm see Diaphragm. In the Anatomy of Mammals the thoracic diaphragm is a sheet of Muscle In Human anatomy, the vertebral column ( backbone or spine) is a column of 34 Vertebrae the Sacrum, Intervertebral
Structure
At their origins the crura are tendinous in structure, and blend with the anterior longitudinal ligament of the vertebral column. The anterior longitudinal ligament is a Ligament that runs down the anterior surface of the spine. In Human anatomy, the vertebral column ( backbone or spine) is a column of 34 Vertebrae the Sacrum, Intervertebral
- The right crus, larger and longer than the left, arises from the anterior surfaces of the bodies and intervertebral fibrocartilages of the upper three lumbar vertebrae. Intervertebral discs (or intervertebral fibrocartilage) lie between adjacent vertebrae in the spine. The lumbar vertebrae are the largest segments of the movable part of the Vertebral column, and are characterized by the absence of the Foramen transversarium within
- The left crus arises from the corresponding parts of the upper two lumbar vertebrae only.
The medial tendinous margins of the crura pass anteriorly and medialward, and meet in the middle line to form an arch across the front of the aorta known as the median arcuate ligament; this arch is often poorly defined. The median arcuate ligament is a Ligament under the diaphragm that connects the right and left crura of diaphragm. The area behind this arch is known as the aortic hiatus.
From this series of origins the fibers of the diaphragm converge to be inserted into the central tendon.
The fibers arising from the xiphoid process are very short, and occasionally aponeurotic; those from the medial and lateral lumbocostal arches, and more especially those from the ribs and their cartilages, are longer, and describe marked curves as they ascend and converge to their insertion. The xiphoid process, also known as the xiphisternum is a small cartilaginous extension to the lower part of the Sternum which is usually The fibers of the crura diverge as they ascend, the most lateral being directed upward and lateralward to the central tendon.
The medial fibers of the right crus ascend on the left side of the esophageal hiatus, and occasionally a fasciculus of the left crus crosses the aorta and runs obliquely through the fibers of the right crus toward the vena caval foramen. In human anatomy the esophageal hiatus is a hole in the diaphragm through which the Esophagus passes The caval opening is a hiatus in the diaphragm of humans through which passes the Inferior vena cava, the wall of which is adherent to the margins of the opening
Additional images
 The relations of the viscera and large vessels of the abdomen. (Seen from behind, the last thoracic vertebra being well raised. ) |
External links
- SUNY Figs 40:04-16 - "The abdominal surface of the diaphragm. The State University of New York Health Science Center at Brooklyn, better known as SUNY Downstate Medical Center, is an academic medical center and is the only one of its kind "
- c_64/12268381 at Dorland's Medical Dictionary - left crus of diaphragm
- c_64/12268085 at Dorland's Medical Dictionary - right crus of diaphragm
- left+crus+of+diaphragm at eMedicine Dictionary
- right+crus+of+diaphragm at eMedicine Dictionary
This article was originally based on an entry from a public domain edition of Gray's Anatomy. Dorland's is the brand name of a family of medical reference works (including dictionaries, spellers word books and spell-check software) in various media (including Dorland's is the brand name of a family of medical reference works (including dictionaries, spellers word books and spell-check software) in various media (including eMedicine is an online clinical medical knowledge base that was founded in 1996 by Scott Plantz and Richard Lavely two medical doctors eMedicine is an online clinical medical knowledge base that was founded in 1996 by Scott Plantz and Richard Lavely two medical doctors The public domain is a range of abstract materials &ndash commonly referred to as Intellectual property &ndash which are not owned or controlled by anyone Henry Gray's Anatomy of the Human Body (or Gray's Anatomy as it has commonly been shortened is an English-language Human anatomy Textbook As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
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