Kidney Lobes and Lobules

The number of lobes in a kidney equals the number of medullary pyramids

Each medullary pyramid and the associated cortical tissue at its base and sides (one half of each adjacent renal column) constitutes a lobe of the kidney. The lobar organ ization of the kidney is conspicuous in the developing fetal kidney (Fig. 19.5). Each lobe is reflected as a convexity on the outer surface of the organ, but they usually disappear after birth. The surface convexities typical of the fetal kidney may persist, however, until the teenage years and, in some cases, into adulthood. Each human kidney contains 8 to 18 lobes. Kidneys of some animals possess only one pyramid; these kidneys are classified as unilobar, in contrast to the multilobar kidney of the human.

A lobule consists of a collecting duct and all the nephrons that it drains

The lobes of the kidney are further subdivided into lobules consisting of a central medullary ray and surrounding cortical material (Fig. 19.6). Although the center or axis of a lobule is readily identified, the boundaries between adjacent lobules are not obviously demarcated from one another by connective tissue septa. The concept of the lobule has an important physiologic basis; the medullary ray containing the collecting duct for a group of nephrons that drain into that duct constitutes the renal secretory

Lobe The Kidney

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Responses

  • fnan brhane
    What is lobe and lobule of kidney?
    2 years ago
  • beverly
    Which fetal lobe of kidney persists?
    2 years ago
  • Vincent
    How many lobes does human kidney have?
    2 years ago
  • IOLANDA TREVISAN
    How many lobes present in kidney?
    2 years ago
  • Barbara
    How many lobes are found in each kidney?
    2 years ago
  • Poppy
    How many lobules is in the kidney?
    1 year ago
  • sarah
    What are renal lobes and lobules?
    1 year ago
  • tanja
    How many lobes of kidney does a porcine have?
    7 months ago
  • else
    Why kidneys have lobules?
    7 months ago
  • james
    How many lobes doesa kidney have?
    7 months ago
  • j thalberg
    How many lobes does a normal kidney hve?
    2 months ago

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