The capsula glomerularis (known also as “Bowman’s capsule”) is a cup-like structure at the beginning of the tubular part of the nephron in the mammalian kidney that performs the first step in the filtration of blood to form urine.
The English surgeon, histologist and anatomist William Bowman discovered the capsula glomerularis after trying to understand the structure and function of the renal corpuscle as there were multiple differing understandings about it at that time. After learning of a new injection method, he injected potassium chromate and lead acetate (which formed lead chromate, a yellow compound) in the renal artery of a kidney and observed it rupture the glomerulus and present itself in a structure and nearby tubules. That structure was the capsula glomerularis. Here is a labelled photomicrograph of a renal corpuscle with the capsula glomerularis (Bowman’s capsule) clearly visible:
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Here is a portrait of William Bowman:
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- https://archive.org/details/philtrans05168220/mode/2up, pages 57-60.
- https://www.auanet.org/education/auauniversity/education- products-and-resources/pathology-for-urologists/normal-histology-and-important-histo-anatomic-structures/kidney-renal-corpuscle-(glomerulus)
- https://collections.nlm.nih.gov/catalog/nlm:nlmuid- 101410722-img