Chapter 14 Urinary System (quizlet) Flashcards
Two principal functions of the urinary system
Excrete wastes & regulate composition of blood
What happens if blood composition is allowed to vary beyond tolerable limits?
Conditions needed for cellular life would be lost
Location of the kidneys: _________ cavity near the ________ body wall, just below the __________
Retroperitoneal (retroperitoneum); posterior; diaphragm
Protect both kidneys
Lower ribs
Which kidney is lower than the other? (Why?)
Right (Large right lobe of the liver pushes it inferiorly)
Approximate distance that kidneys move inferiorly when patient is in deep inspiration
1 inch
Dark red, bean-shaped organs
Kidneys
Normal length measurement of kidneys
9-12 cm
Normal width measurement of kidneys
5 cm
Normal depth measurement of kidneys
2.5 cm
numerous collecting tubules that bring the urine from its sites of formation in the cortex to the pyramids; functional units of the kidney
nephrons (renal tubules)
darker part of the kidney because of increased perfusion of blood
outer cortex
lighter-colored part of the kidney
inner medulla
renal pyramids empty into the ________
renal pelvis
vertical indentation on the medial surface of each kidney; where vessels and ureter enter and exit
renal hilum (hilus)
Most posterior and superior structure exiting the renal hilum (hilus)
renal artery
Anterior to the renal artery within the renal hilum (hilus)
renal vein
slightly inferior to the renal artery within the renal hilum (hilus)
ureter
Also found with renal hilum (hilus) besides renal arteries, renal veins and ureter
lymph vessels & sympathetic fibers
fibrous capsule that surrounds the kidney
true capsule
surrounds the fibrous capsule of the kidney
perinephric fat
surrounds the perinephric fat & encloses the kidneys & adrenal glands; is a condensation of areolar tissue that is continuous laterally with the fascia transversalis
perinephric fascia
renal fascia surrounding the true capsule and perinephric fat
Gerota’s fascia
Adrenal gland, liver, Morison’s pouch, second part of the duodenum and colic flexure are located where (in relation to which kidney?)
Anterior to the right kidney
Adrenal gland, spleen, stomach, pancreas, colic flexure and coils of jejunum are located where (in relation to which kidney?)
Anterior to the left kidney
Diaphragm, costodiaphragmatic recess of the pleura, twelfth rib, psoas muscle, quadratus lumborum & transversus abdominis muscles are located where (in relation to which kidney?)
Posterior to the right kidney
Diaphragm, costodiaphragmatic recess of the pleura, eleventh & twelfth ribs, psoas muscle, quadratus lumborum & transversus abdominis muscles are located where (in relation to which kidney?)
Posterior to the left kidney
upper expanded end of the ureter; as is leaves the renal sinus, it rapidly becomes smaller and ultimately merges with the ureter
renal pelvis
the renal pelvis divides into 2 or 3 __________
major calyces
each major calyx divides into 2 or 3 ___________
minor calyces
apex of a medullary pyramid; indents each minor calyx
renal papilla
internal element of the kidney; consists of a series of striated conical masses (renal pyramids)
medullary portion
external element of the kidney;
cortical substance
Number of pyramids
8-18
bases of the pyramids are directed toward the ___________
outer circumference (of kidney)
apices of the pyramids converge toward the _________
renal sinus
prominent _______ of the renal pyramids project into the lumina of the minor calyces
papillae
surround the calyces and may exert a milking action on the minor calyces, aiding in the flow of urine into the renal pelvis
spirally arranged muscles
nephron consists of these two main structures
renal corpuscle & renal tubule
filter the blood and produce urine
nephrons
network of capillaries (glomerulus) surrounded by a cuplike structure (Bowman’s capsule) where blood is filtered within the kidney
renal corpuscle
blood flows into the glomerulus through a small ______
afferent arteriole
blood leaves the glomerulus through an ___________ which conducts blood to a second set of capillaries (peritubular capillaries) which surround the renal tubule
efferent arteriole
filtrate passes through these sections of renal tubules after exiting Bowman’s capsule in this order
(coiled) proximal convoluted tubule (within renal cortex), loop of Henle (dip into medulla), distal convoluted tubule (within renal cortex, comes into contact with afferent/efferent arterioles to form the juxtaglomerular apparatus), collecting duct
structure that helps regulate blood pressure in the kidney
juxtaglomerular apparatus
Average length of ureter
25 cm
located in retroperitoneal cavity, are obscured by bowel gas, emerge from the hilus of the kidney, run vertically downward behind parietal peritoneum along the psoas muscle (separates this from the tips of the transverse processes of the lumbar vertebrae), cross bifurcation of the common iliac arteries anterior to the sacroiliac joint to enter the pelvis, course along lateral wall of pelvis to the region of the ischial spine, turn forward to enter the lateral angle of the bladder
ureter
1-where the ureter leaves the renal pelvis
location of three constrictions along the ureter’s course
large muscular bag; has a posterior and lateral opening for the ureters & anterior opening for urethra
urinary bladder
interior of the bladder is lined with ____________
highly elastic transitional epithelium
membranous tube that passes from the anterior part of the urinary bladder to the outside of the body
urethra
two sphincters of the urethra
internal & external
arterial supply to the kidney
main renal artery
branches of the main renal artery into kidney
two anterior & one posterior to the pelvis of the ureter (size & number may vary - in most cases, two primary branches: a larger anterior & smaller posterior. These break down into smaller segmental arteries, then into interlobar arteries & finally into tiny arcuate arteries)
5-6 veins exit the kidney and join to form this vein that emerges from the renal hilus anterior to the renal artery; drains into the lateral walls of the IVC; returns cleansed blood to the general circulation
main renal vein
follow the renal artery to the lateral aortic lymph nodes near the origin of the renal artery
lymphatic vessels
arterial supply to the ureter
renal artery, gonadal artery & superior vesical artery