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Excretion

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... are the major calyces and the smaller extensions ... CALYX. COLUMN. Review. MEDULLA (Specifically, a pyramid.) CORTEX. PELVIS. CAPSULE. Segmental Arteries ... – PowerPoint PPT presentation

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Title: Excretion


1
Excretion
  • Sheep Kidney Dissection

2
Urinary System two kidneys, two ureters, one
urinary bladder, one urethra
  • This system has two basic functions, both of
    which occur in the kidneys. The first function is
    to remove nitrogenous wastes (such as creatine,
    urea, and uric acid) from the body. The second
    function is to maintain the electrolyte,
    acid-base, and fluid balances of the blood.
  • One product of these processes is urine, which --
    generally -- is a pale yellow fluid containing
    water, urea, sodium, potassium, phosphate,
    sulfate ions, creatine, uric acid, calcium,
    magnesium, and bicarbonate ions.
  • Urine moves from the kidneys to the urinary
    bladder in the ureters, which, for the purposes
    of this lab, are extensions of the renal pelvis.
    Urine is stored in the urinary bladder until it
    leaves the body via the urethra.

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4
Renal Capsule A smooth semitransparent membrane
that adheres tightly to the outer surface of the
kidney.
5
Remove renal capsule
6
Renal Cortex The region of the kidney just
below the capsule. When your kidney is dissected,
then you should be able to see blue and red
specks scattered through the cortex. These are
specks of injected latex that illustrate the rich
vascular supply of the cortex.
7
Medullary Region (renal medulla)
  • The region just deep to the cortex that is
    segregated into triangular and columnar regions.
  • The triangular regions are the renal pyramids,
    which should be striated (or striped) in
    appearance due to the collecting ducts running
    through them.
  • The columnar regions between the pyramids are the
    renal columns. These renal columns are where the
    interlobar arteries are located.

8
Renal Medulla
9
Make a frontal (coronal) section through the
kidney
10
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12
Renal Pelvis
  • A cavity within the kidney that is continuous
    with the ureter, which exits from the hilus. The
    pelvis has portions that extend towards the
    apexes of the renal pyramids. The primary (large)
    extensions are the major calyces and the smaller
    extensions are the minor calyces.

13
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14
Ureter
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20
Review
  • MEDULLA (Specifically, a pyramid.)
  • CORTEX
  • PELVIS
  • CAPSULE

21
  • Segmental Arteries
  • 2) Kidney
  • 3) Ureter
  • 4) Abdominal Aorta
  • 5) Renal Artery

22
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