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Full-body hemihypertrophy. Hemihypertrophy, now more commonly referred to as hemihyperplasia in the medical literature, is a condition in which one side of the body or a part of one side of the body is larger than the other to an extent considered greater than the normal variation.
The outer layer of each kidney is made up of a fibrous sheath called a renal capsule. The peripheral layer of the kidney is called the cortex, and the inner layer is called the medulla. The medulla consists of pyramids (also called malpighian pyramids), ascending with their base to the cortex and forming together with it the renal lobe. [59]
The asymmetry within the abdominal cavity, caused by the position of the liver, typically results in the right kidney being slightly lower and smaller than the left, and being placed slightly more to the middle than the left kidney. [10] [11] [12] The left kidney is approximately at the vertebral level T12 to L3, [13] and the right is slightly ...
The renal crest usually appears in animals larger than rabbits. [68] The kidneys of bovines are multilobar with external lobation. [72] Marine mammals, bears and otters have reniculate kidneys which are made of large amount of lobes called reniculi. [73] Each renculus can be compared to a simple unipapillary kidney as a whole. [74]
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For instance, if one kidney is surgically removed, the cells of the other kidney divide at an increased rate. [1] Eventually, the remaining kidney can grow until its mass approaches the combined mass of two kidneys. [1] Along with the kidneys, compensatory growth has also been characterized in a number of other tissues and organs including:
In other words, a juxtamedullary nephron is a nephron whose renal corpuscle is near the medulla, and whose proximal convoluted tubule and its associated loop of Henle occur deeper in the medulla than the other type of nephron, the cortical nephron. The juxtamedullary nephrons comprise only about 15% of the nephrons in the human kidney.
The kidney is directed to excrete or retain sodium via the action of aldosterone, antidiuretic hormone (ADH, or vasopressin), atrial natriuretic peptide (ANP), and other hormones. Abnormal ranges of the fractional excretion of sodium can imply acute tubular necrosis or glomerular dysfunction.