Victor Forge
The kidneys are a pair of organs located in the back of the abdomen, behind the peritoneum, and are considered retroperitoneal organs. They are found along the posterior muscular wall of the abdominal cavity, with the left kidney typically positioned slightly higher than the right. The diaphragm covers the superior half of each kidney, with the psoas major muscle, quadratus lumborum, and transversus abdominis muscle also in proximity to the kidneys.
| Characteristics | Values |
|---|---|
| Muscles behind the kidneys | Psoas major muscle, quadratus lumborum, transversus abdominis muscle |
| Location of kidneys | Retroperitoneally, behind the peritoneum, in the abdomen |
| Kidney shape | Bean-shaped |
| Kidney function | Filter blood, remove waste, balance body fluids |
| Kidney protection | Ribs and muscles of the back |
| Kidney covering | Renal capsule, a fibrous connective tissue |
| Kidney surface | Divided into three vertical stripes |
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What You'll Learn
- The diaphragm covers the superior half of each kidney
- The psoas major muscle is associated with the medial stripe
- The quadratus lumborum is associated with the central stripe
- The transversus abdominis muscle is associated with the lateral stripe
- The kidneys are protected by the ribs and muscles of the back
The diaphragm covers the superior half of each kidney
The kidneys are two bean-shaped organs that sit in the back of the abdomen, below the ribcage, and on either side of the spine. They are located between the intestines and the diaphragm, with the left kidney typically positioned slightly more superiorly than the right. The diaphragm is a muscle that separates the chest cavity from the abdominal cavity. It is the main muscle involved in breathing, and it contracts and relaxes to allow for the intake and output of air.
The diaphragm is also involved in maintaining core stability and posture. It is a crucial muscle for athletes, particularly those involved in sports that require a lot of core stability, such as gymnastics and diving. The diaphragm also plays a role in coughing, sneezing, and vomiting. During these actions, the diaphragm contracts to assist in expelling air, fluid, or particles from the body.
The inferior half of the kidneys is related to muscles that can be remembered by dividing the kidney surface into three vertical stripes. The medial stripe represents the impression of the psoas major muscle, the central stripe the quadratus lumborum, and the lateral stripe the transversus abdominis muscle. These muscles provide support and stability to the kidneys and also play a role in respiration and core stability.
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The psoas major muscle is associated with the medial stripe
The kidneys are two bean-shaped organs that sit in the back of the abdomen, below the ribcage, and on either side of the spine. They are retroperitoneal, meaning they are not wrapped in peritoneal layers like most abdominal organs, but rather are placed behind them.
The psoas major muscle is located in the lumbar region of the trunk, lateral to the lumbar vertebrae and medial to the quadratus lumborum muscle. It is a long, thick, fusiform muscle, and it belongs to the inner muscles of the hip group. The name 'psoas' is of Greek origin, meaning 'muscle of the loin'.
The psoas major muscle is closely related to a number of retroperitoneal structures. The inferior vena cava is located medial to the right psoas major muscle, and the abdominal aorta is located medial to the left psoas major muscle. The psoas major muscle is also related to the sympathetic trunk and aortic lymph nodes, which are located medially.
The psoas major muscle is important for back health and plays a role in maintaining correct lumbar posture. It is involved in the lateral flexion of the lumbar spine and assists with flexion and external rotation of the hip. The muscle fibres converge as they descend on the posterior abdominal wall, crossing the pelvic inlet to form a long tendon.
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The quadratus lumborum is associated with the central stripe
The kidneys are located in the back of the abdomen, behind the peritoneum, with one kidney on each side of the spine. The posterior surface of the kidneys is related to certain neurovascular structures and muscles.
The muscle originates from the iliolumbar ligament and the iliac crest and attaches to the transverse processes of the lumbar vertebrae L1-L4 and the 12th rib. The quadratus lumborum has a complex structure, with three muscle fibre layers that have different vectors. Its shape is generally quadriangular, which is why it is described as "quadratus" in Latin.
The quadratus lumborum is important for the stabilisation and movement of the spine and pelvis. It is also an accessory muscle of expiration, fixing the 12th rib during movements of the thoracic cage. Overuse and strain of the quadratus lumborum can lead to chronic lower back pain.
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The transversus abdominis muscle is associated with the lateral stripe
The kidneys are positioned in the back of the abdomen, behind the peritoneum. The posterior surfaces of the kidneys are related to certain neurovascular structures and muscles. The superior half of each kidney is covered by the diaphragm, and the kidneys move up and down during respiration.
The muscular relations of the inferior half of the kidney are easy to remember by dividing the kidney surface into three vertical stripes. The medial stripe represents the impression of the psoas major muscle, the central stripe represents the quadratus lumborum, and the lateral stripe represents the transversus abdominis muscle.
The transversus abdominis muscle is a flat muscle that forms the anterior abdominal wall. It is the deepest of the lateral abdominal muscles, with the internal and external oblique muscles also forming the lateral abdominal wall. The transversus abdominis muscle contributes to maintaining abdominal tone and can increase intra-abdominal pressure when it contracts.
The transversus abdominis muscle has several origin points, including the lateral one-third of the superior surface of the inguinal ligament and the anterior two-thirds of the inner lip of the iliac crest. The muscle fibres course horizontally over the lateral abdominal wall towards the midline, perpendicular to the linea alba. The lower fibres curve medially and posteriorly to form the roof of the inguinal canal with the internal oblique muscle.
The transversus abdominis muscle plays an important role in maintaining normal abdominal wall tension, holding the abdominal organs in place. Weakness in this muscle can increase the risk of abdominal hernias. The lateral abdominal muscles, including the transversus abdominis, cause compression of the intra-abdominal viscera, increasing intra-abdominal pressure.
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The kidneys are protected by the ribs and muscles of the back
The kidneys are a pair of organs found in the back of the abdomen, along the posterior muscular wall of the abdominal cavity. They are located just below the rib cage, on either side of the spine, and behind the belly. The left kidney is typically positioned slightly higher than the right kidney due to the larger size of the liver on the right side of the body. The kidneys are encased in complex layers of fascia and fat, which provide protection. The outermost layer is a layer of fat tissue called the pararenal or paranephric fat body, which separates the kidneys from the muscles of the abdominal wall.
The inferior half of each kidney is related to three muscles: the psoas major muscle, the quadratus lumborum, and the transversus abdominis muscle. These muscles can be visualised as three vertical stripes on the kidney surface, with the psoas major muscle represented by the medial stripe, the quadratus lumborum by the central stripe, and the transversus abdominis muscle by the lateral stripe.
In addition to the diaphragm and the three muscles of the inferior half, other muscles and structures also contribute to the protection of the kidneys. The kidneys are surrounded by a thin layer of fibrous connective tissue called the renal capsule, which provides stability and protection from injury. The renal fascia, a layer of connective tissue, encloses the kidneys and the suprarenal glands, offering further protection.
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Frequently asked questions
The kidneys are located in the back of the abdomen, just below the ribcage, and typically one kidney sits on either side of the spine.
The diaphragm covers the superior half of each kidney, with the psoas major muscle, quadratus lumborum, and transversus abdominis muscle also in close proximity.
The kidneys' primary function is to filter blood and remove waste products, such as toxins, maintaining the body's fluid balance.
You can use the mnemonic "1-2-3-4 All Boys Need Muscle", with the numbers representing the four muscles in the following order: diaphragm, psoas major, quadratus lumborum, and transversus abdominis.
