Download MBBS Kidney Ureter and Suprarenal Gland Lecture PPT

Download MBBS (Bachelor of Medicine and Bachelor of Surgery) Latest Kidney Ureter and Suprarenal Gland Lecture PPT


OBJECTIVES

-Anatomical features of the kidneys:

position, extent, relations, hilum, peritoneal

coverings.

-Internal structure of the kidneys:

Cortex, medulla and renal sinus.

-The vascular segments of the kidneys.

-The blood supply and lymphatics of the kidneys.


POSITION OF KIDNEY
Kidneys are retroperitoneal paired

organs.
? Each kidney lies , on the posterior

abdominal wall, lateral to the

vertebral column
? In the supine position, the kidneys

extend from approximately T12 toL3.
? The right kidney is slightly lower

than the left kidney because of the

large size of the right lobe of the liver.
? With contraction of the diaphragm

during respiration, both kidneys

move downward in a vertical

direction (high of one vertebra, 1

inch,2.5 cm).


COLOUR, SHAPE & DIMENSIONS

? The kidney is a reddish brown, bean-sh

aped organ with the dimensions 12 x 6 x

3cm.
? Although they are similar in size and

shape, the left kidney is slightly longer

and more slender than the right kidney,

and nearer to the midline.
? Each kidneys has:Convex upper & lower

ends.
Convex lateral border &Convex medial

border at both ends, but its middle shows

a vertical slit called the hilum.Internally

the hilum extends into a large cavity called

the renal sinus.


HILUM & RENAL SINUS

? The hilum transmits, from ant
erior to posterior, the renal vei
n, renal artery & the ureter (VAU).

? Lymph vessels & sympathetic
fibers also pass through the hilum.

? The renal sinus contains the upper

expanded part of the ureter called

the renal pelvis.

? Perinephric fat is continues into the

hilum and the sinus and
surrounds all these structures.


COVERINGS

1. Fibrous capsule:
Is closely adherent to its surface
2. Perirenal fat:
covers the fibrous capsule.
3. Renal fascia:
Condensation of areolar connecti
ve tissue that lies outside the
Perirenal fat and encloses the

kidney and the suprarenal gland.
4. Pararenal fat:
Lies external to the renal fasci
a, is part of the retroperitoneal fat.


ANTERIOR RELATIONS

The anterior surface of

both kidneys are related to

numerous structures, some

with an intervening layer of
peritoneum and others lie

directly against the kidney

without peritoneum.


LEFT KIDNEY

? A small part of the superior

pole,along the medial border , is

covered by left suprarenal gland.

? The rest of the superior pole is

covered by the intraperitoneal

stomach and spleen

.
? The retroperitoneal pancreas

covers the middle part of the kidney.

? Its lower lateral part is directly

related to the left colic flexure and

beginning of descending colon.

? Its lower medial part is covered by

the intraperitoneal jejunum.


RIGHT KIDNEY
? A small part of the upper pole
is covered by right suprarenal gland.

? The rest of the upper part of

anterior surface is related to the

liver and is separated by a layer of

peritoneum.

? The 2nd part of duodenum lies

directly in front of the kidney
close to its hilum.
? The lower lateral part is directly

related to the right colic flexure and,

on its lower medial side, is related to

the intraperitoneal small intestine


POSTERIOR RELATIONS

Posteriorly, the right and left kidneys are almost related to similar structures.

Left kidney:

Diaphragm

Right kidney:

Costodiaphragmatic rec

? Diaphragm

ess of the pleura

? Costodiaphragmatic

11th & 12th ribs; last int

recess, of the pleur

ercostal space

a

Psoas major

? 12th rib, last interco

Quadratus lumborum tr

stal space

ansversus abdomini

? Psoas major

s.

? Quadratus lumboru

Subcostal (T12),

m, transversus abd

iliohypogastric & ilioin

ominis.

guinal nerves.

? Subcostal (T12), ili

ohypogastric & ilioi

nguinal nerves.


Vertebrocostal & Renal Angles

? The angle between

the last rib and the

lateral border of erector

spinae muscle is

occupied by kidney and

is called the `Renal

angle'

? The Vertebrocostal

angle is occupied by the

lower part of the pleural

sac.


INTERNAL STRUCTURE


INTERNAL STRUCTURE
? Each kidney consists of an

outer renal cortex and an

inner renal medulla.
? The renal cortex is a

continuous band of pale tissue

that completely surrounds the

renal medulla.
? Extensions of the renal

cortex,the renal columns

project into the inner aspect of

the kidney,dividing the renal

medulla into discontinuous

aggregations of triangular-

shaped tissue, the renal

pyramids.


The bases of the renal pyramids are

directed outward, toward the cortex,

while the apex of each renal pyramid

projects inward, toward the renal

sinus.

? The apical projection (renal
papilla) is surrounded by a minor

calyx

? In the renal sinus, several
minor calices unite to form a major

calyx, and two or three major calices

unite to form the renal pelvis, which
is the funnel-shaped superior end of

the ureters


ARTERIAL SUPPLY

The renal artery arises from the aorta

at the level of the second lumbar

vertebra.
? Each renal artery divides into 5

segmental arteries that enter the hilum

of the kidney, 4 in front of the renal

pelvis and one behind it.
? They are distributed to the different

segments of the kidney.
? Each segmental artery gives rise to

number of lobar arteries, each supplies

a renal pyramid.
? Before entering the renal substance,

each lobar artery gives off two or three

interlobar arteries.


? The interlobar arteries run

toward the cortex on each side

of the renal pyramid.
? At the junction of the cortex

and the medulla, the Interlobar

arteries give off the arcuate

arteries, which arch over the

bases of the pyramids.

? The arcuate arteries give off

several interlobular arteries

that ascend inthe cortex and

give off the afferent glomerular

arterioles


Segmental branches &

vascular segments of

kidneys(e.g. Left)

Each kidney has 5

segmental branches and is

divided into 5 vascular

segments:

1. Apical.
2. Caudal/Lower
3. Anterior

Superior/Upper
4. Anterior Inferior/Middle
5. Posterior.


BLOOD SUPPLY

Abdominal

aorta

? Inferior

? Renal artery

vena cava

? Segmental

? Renal vein

arteries

? Interlobar

? lobar arteries

veins

? Interlobar

? Arcuate

arteries

? Arcuate

veins

arteries

?Interlobular

? Interlobular

veins

arteries

? Afferent

glomerular

arterioles


Venous Drainage

Both renal veins drain to the inferi

or vena cava.

? The right renal vein is behind the 2nd p

art of the duodenum and sometimes

behind the lateral part of the head of t

he pancreas

? The left renal vein is three times longer t

han the right (7.5 cm and 2.5 cm).

? So, for this reason the left kidney is the pr

eferred side for live donor nephrectomy.

? It runs from its origin in the renal hilum,

posterior to the splenic vein and the bod

y of pancreas, and then across the anteri

or aspect of the aorta, just below the ori

gin of the superior mesenteric artery.

? The left gonadal vein enters it from belo

w and the left suprarenal vein, usually re

? The right renal vein is behind the 2nd p

ceiving one of the left inferior phrenic vei

art of the duodenum and sometimes

ns, enters it above but nearer the midline

behind the lateral part of the head of the

? The left renal vein enters the inferior vena pancreas.

cava a little above the right vein.


Lymphatic

Drainage:

? The lymph

vessels follow the arteries.

? Lymph drains to the

lateral aortic lymph nodes

around the origin of the

renal artery.

Nerve Supply:

The nerve supply is the

renal sympathetic plexus.

The afferent fibers that

travel through the renal

plexus enter the spinal

cord in the

10th, 11th, and 12th

thoracic nerves.
URETER


INTRODUCTION

? The ureter is a narrow, thick

walled, expansile muscular

tube.

? Conveys urine from the kidney

to the urinary bladder.

? The urine is propelled from the

kidney to the urinary bladder

by the peristaltic contractions

of the smooth muscle of the

wall of the ureter.
Measurements

? Length: 25 cm (10 inches).

? Diameter: 3 mm.


COURSE IN ABDOMINAL PART

? The ureter begins as a

downward continuation of a

funnel shaped renal pelvis at

the medial margin of the

lower end of the kidney.

? The ureter passes

downward and slight medially

on the psoas major, which

separates it from the

transverse processes of the

lumbar vertebrae.

? Enters the pelvic cavity by

crossing in front of the

bifurcation of the common

iliac artery at the pelvic brim

in front of the sacroiliac joint.


COURSE IN PELVIS

? In the pelvis, the ureter first runs

downward, backward, and laterally

along the anterior margin of the

greater sciatic notch.

? Opposite to the ischial spine, it

turns forward and medially to reach

the base of the urinary bladder.

? Where it enters the bladder wall

obliquely.

? Within the bladder wall, it narrows

down,takes a sinuous course, and

opens into the cavity of the bladder

at the lateral angle of its trigone as

ureteric orifice.
PARTS AND RELATIONS

? The ureter is generally divided into two parts: abdominal

and pelvic.

? Each part is about the same length, i.e., 12.5 cm (5 inches).

? The abdominal part of ureter extends from the renal pelvis

to the bifurcation of the common iliac artery.

? The pelvic part of the ureter extends from the pelvic brim

(at the level of bifurcation of the common iliac artery) to the

base of the urinary bladder.


RELATIONS OF ABDOMINAL PART

Medially the right ureter is related to inferior vena

cava and left ureter is related to left gonadal vein

and inferior mesenteric vein.

RELATIONS OF PELVIC PART

? The pelvic part of the ureter crosses in front of

all the nerves and vessels on the lateral pelvic wall

except vas deferens, which crosses in front of it.

? Near the uterine cervix, the uterine artery lies

above and in front of it, a highly important surgical

relationship.
SITES OF ANATOMICAL

NARROWINGS/CONSTRICTIONS

The lumen of the ureter is not uniform throughout and presents three

constrictions at the following sites.

1. At the pelviureteric junction where the renal pelvis joins

the upper end of ureter. It is the upper most constriction,

found approximately 5 cm away from the hilum of kidney.

2. At the pelvic brim where it crosses the common iliac artery.

3. At the uretero-vesical junction (i.e., where ureter enters

into thebladder).


? In addition to above

three sites of

constrictions, two more

sites of constrictions

are described by the

surgeons.

1. At juxtaposition of

the vas

deferens/broad

ligament.

2. At the ureteric orifice.


ARTERIAL SUPPLY

? The ureter derives its arterial

supply from the branches of all the

arteries related to it. The

important arteries supplying

ureter from above downward are:

1. Renal.

2. Testicular or ovarian.

3. Direct branches from aorta.

4. Internal iliac.

5. Vesical (superior and inferior).

6. Middle rectal.

7. Uterine.
? VENOUS DRAINAGE

The venous blood from the ureter is drained into

the veins corresponding to the arteries.

? LYMPHATIC DRAINAGE

The lymph from the ureter is drained into lateral

aortic and iliac nodes.

? NERVE SUPPLY

1. The sympathetic supply of the ureter is derived

from T12?L1 spinal segments through renal, aortic,

and hypogastric plexuses.

2. The parasympathetic supply of ureter is derived

from S2?S4 spinalsegments through pelvic

splanchnic nerves.
Clinical correlation

? Mobilization of ureter: Branches of the arteries supplying

the ureter form an anastomosis in the fat and fascia around the ureter.

Therefore, surgeons should bear in their mind that stripping off this

fascia, while mobilizing the ureter for transplantation, will hamper the

blood supply of the ureter and may cause its necrosis.

? Identification of ureter: Ureter is a muscular structure, and

in life waves of muscular contractions produce a worm-like rhythmic

movement (peristalsis) thus milking urine toward the bladder. The

ureter is readily identified in life by its thick muscular wall which is

seen to undergo worm-like writhing movements, especially when it is

gently stroked or Squeezed.
Clinical correlation

? Ureteric calculus is likely to lodge at one of the sites of anatomical

narrowings of the ureter particularly:

(a) At the pelvic ureteric junction.

(b) Where it crosses the pelvic brim.

(c) In the intramural part--the narrowest part.

? Injury to ureters: According to Kenson and Hinman, the ureter may

be injured at one of the following four dangerous sites:

(a) Point where the ureter crosses the iliac vessels.

(b) In the ovarian fossa.

(c) Where the ureter is crossed by the uterine artery (most dangerous

site) as damage is likely at this site during hysterectomy.

(d) At the base of the bladder.
THE ADRENAL

GLAND(SUPRARENAL GLAND)
Position and location

- The adrenal glands located on the upper poles of

each kidney on the right and left sides.

-They are covered by peritoneum on the posterior

abdominal wall they are embeddedinto pre renal

fat.

- The left one is larger and higher than the right


Location:

Rest superiorly to

kidneys

Hormones Produced:

~30 steroid hormones!
The right adrenal gland

-It is triangular in shape located on the upper pole

of the right kidney behind the inferior vena

cava.

-It is related anterior to the inferior vena cava and

the right lobe of the liver.

-Posterior it is related to the right crus of diaphragm


The right adrenal gland
The left adrenal gland

-It is crescent in shape located on the upper pole of

the left kidney behind the stomach

-Anterior it is related to the stomach, the tail of

pancreas and the lesser sac

- Posterior it is related to the left crus of diaphragm


Relation of the left gland


The blood supply

Each adrenal gland supply by three arteries superior ,middle and inferior

supra renal arteries.

The superior supra renal artery branch from inferior phrenic artery

which is branch from the aorta, the middle supra renal artery branch

from the aorta and the inferior supra renal artery branch from the renal

artery

The venous drainage by the supra renal vein on the

right side at the inferior vena cava and on the left side

at the left renal vein
Structure of adrenal gland

--The adrenal gland formed of outer cortex which is yellow

forming the main mass of the gland

and inner medulla completely enclosed by the cortex except

at the hilum the gland enclosed by capsule of connective

tissue.

-The cortex has mesoderm development while the medulla

developed from the neural crest


The cortex and capsule

This post was last modified on 30 November 2021