Unit 4. Renal Physiology
Discussed Below
Functional
Anatomy of Kidney
The kidney
is compound tabular gland,adapted to filtering wastes from the blood .It is
enclosed in a strong capsule of connective tissue that containes a few smooth
fibres.
Ø Cortex :- The cortex is granular in apperaratureched
because the tubules here are much
convoluted and its also contain the malphigian corpuscles. The cortex overlies
the bases of modularly pyramids and tips down between them . These displaced
portion of cortex which invade the
modularly territority are called the renal columns of Bertin.When viewed with a magnifying lens it becomes evident that the cortex is
not uniform in texture. It is subdivided into alternating radial tracts known
as rays and labyrinths.The rays are radialy striate becouse they contain the straight parts of proximal tubules and collecting ducts.
Ø Medulla :- The medulla
looks striated as the tubules run through it in a straight cours radiating towards the pelvis. The
medulla consist of 10 to 15 conical
masses ,the renal pyremids whose base adjacent to the cortex and whose
apices from the papilla. These spaces between calyces are part of the renal
sinus and filled with adipose tissue vessels and nerves.The calyces join to
expanded beginning of the ureter.In the
medulla are also present the medularly rays where the tubules are rumming
in straight course.
Ø Hillum:- The medial concave border of a kidney contain a notch known as the hillum through which the renal artery
enters and the renal veins and are urether leave the kidney.
·
Uriniferouse
Tubule :- A complete uriniferouse tubule consist bof two components parts :-
1.The secreatory tubule or nephrone which is long and unbranched . 2.The encretory portion which is branched
true like system of excretory ducts.
Secretory Tubule :- It
consist of bthe following parts :-
(i)A dilated blind end the glomerularal capsule , Which
invaginated to enclose a fuft of convoluted blood capillaries , the glomerulus.The whole structure
is called a Malphigian Corpuscle.
(ii)The tubule leaves
the capsule by constricted neck.Passing into the greately costorted
proximal convoluted tubules.
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