The adrenal glands are located on top of the kidneys and each consists of an inner medulla and outer cortex. The medulla produces epinephrine and norepinephrine, while the cortex is divided into three layers that produce different hormones: the zona glomerulosa produces mineralocorticoids like aldosterone; the zona fasciculata produces glucocorticoids like cortisol; and the zona reticularis produces weak androgens. These hormones work together to regulate fluid balance, metabolism, and other critical bodily functions.
anatomy and physiology of adrenal cortex . detail of artery and venous supply along with histological differences of adrenal cortex . detail of biosynthesis of adrenocorticosteroids. reaction of biosynthesis of cortisol , androgen and aldosterone in different region ie. zona fasciculata, zona reticularis and zona glomerulosa respectively. biochemical function of cortisol and aldosterone along with structures. congenital adrenal hyperplasia.
anatomy and physiology of adrenal cortex . detail of artery and venous supply along with histological differences of adrenal cortex . detail of biosynthesis of adrenocorticosteroids. reaction of biosynthesis of cortisol , androgen and aldosterone in different region ie. zona fasciculata, zona reticularis and zona glomerulosa respectively. biochemical function of cortisol and aldosterone along with structures. congenital adrenal hyperplasia.
Juxtaglomerular apparatus (The Guyton and Hall physiology)Maryam Fida
JUXTAGLOMERULAR APPARATUS
Juxtaglomerular apparatus is a specialized organ situated near the glomerulus of each nephron (juxta = near).
1..MACULA DENSA
Macula densa is the end portion of thick ascending segment. It is situated between afferent and efferent arterioles of the same nephron. It is very close to afferent arteriole.
Macula densa is formed by tightly packed cuboidal epithelial cells.
2..EXTRAGLOMERULAR MESANGIAL CELLS
Extraglomerular mesangial cells are situated in the triangular region bound by afferent arteriole, efferent arteriole and macula densa. These cells are also called agranular cells, lacis cells or Goormaghtigh cells.
3. Glomerular Mesangial Cell
Structure and function of adrenal glandsMoses Kayungi
Structure and function of adrenal glands
• Anatomically, the adrenal glands (suprarenal) are located in the thoracic abdomen situated 'on' top of the kidneys one on each side, specifically on their anterosuperior aspect.
• They are surrounded by the adipose capsule and the renal fascia
• They consist of two parts,
The outer cortex
The inner medulla.
Adrenal Cortex
• The adrenal cortex is devoted to the synthesis of corticosteroid hormones from cholesterol.
It completes the hypothalamic-pituitary-adrenal axis
The source of cortisol and corticosterone hormones
• The cortex is divided into three zones, or layers.
• This division is sometimes referred to as ‘functional zonation”
Zona glomerulosa
Zona fasciculata
Zona reticularis
Adrenal Medulla
• The adrenal medulla is the core of the adrenal gland, and is surrounded by the adrenal cortex.
• The chromaffin cells of the medulla are the body's main source of the circulating catecholamines, adrenaline (epinephrine) and noradrenaline (norepinephrine
Blood supply to Adrenal Gland
• Although variations of the blood supply to the adrenal glands (and indeed the kidneys themselves) are common, there are usually three arteries that supply each adrenal gland:
The superior suprarenal artery is provided by the inferior phrenic artery.
The middle suprarenal artery is provided by the abdominal aorta.
The inferior suprarenal artery is provided by the renal artery
• Venous drainage of the adrenal glands is achieved via the suprarenal veins:
The right suprarenal vein drains into the inferior vena cava.
The left suprarenal vein drains into the left renal vein or the left inferior phrenic vein
Each kidney contains over 1 million tiny structures called nephrons. Each nephron has a glomerulus, the site of blood filtration. The glomerulus is a network of capillaries surrounded by a cuplike structure, the glomerular capsule (or Bowman’s capsule). As blood flows through the glomerulus, blood pressure pushes water and solutes from the capillaries into the capsule through a filtration membrane. This glomerular filtration begins the urine formation process.Inside the glomerulus, blood pressure pushes fluid from capillaries into the glomerular capsule through a specialized layer of cells. This layer, the filtration membrane, allows water and small solutes to pass but blocks blood cells and large proteins. Those components remain in the bloodstream. The filtrate (the fluid that has passed through the membrane) flows from the glomerular capsule further into the nephron.The glomerulus filters water and small solutes out of the bloodstream. The resulting filtrate contains waste, but also other substances the body needs: essential ions, glucose, amino acids, and smaller proteins. When the filtrate exits the glomerulus, it flows into a duct in the nephron called the renal tubule. As it moves, the needed substances and some water are reabsorbed through the tube wall into adjacent capillaries. This reabsorption of vital nutrients from the filtrate is the second step in urine creation.The filtrate absorbed in the glomerulus flows through the renal tubule, where nutrients and water are reabsorbed into capillaries. At the same time, waste ions and hydrogen ions pass from the capillaries into the renal tubule. This process is called secretion. The secreted ions combine with the remaining filtrate and become urine. The urine flows out of the nephron tubule into a collecting duct. It passes out of the kidney through the renal pelvis, into the ureter, and down to the bladder.The nephrons of the kidneys process blood and create urine through a process of filtration, reabsorption, and secretion. Urine is about 95% water and 5% waste products. Nitrogenous wastes excreted in urine include urea, creatinine, ammonia, and uric acid. Ions such as sodium, potassium, hydrogen, and calcium are also excreted
Juxtaglomerular apparatus (The Guyton and Hall physiology)Maryam Fida
JUXTAGLOMERULAR APPARATUS
Juxtaglomerular apparatus is a specialized organ situated near the glomerulus of each nephron (juxta = near).
1..MACULA DENSA
Macula densa is the end portion of thick ascending segment. It is situated between afferent and efferent arterioles of the same nephron. It is very close to afferent arteriole.
Macula densa is formed by tightly packed cuboidal epithelial cells.
2..EXTRAGLOMERULAR MESANGIAL CELLS
Extraglomerular mesangial cells are situated in the triangular region bound by afferent arteriole, efferent arteriole and macula densa. These cells are also called agranular cells, lacis cells or Goormaghtigh cells.
3. Glomerular Mesangial Cell
Structure and function of adrenal glandsMoses Kayungi
Structure and function of adrenal glands
• Anatomically, the adrenal glands (suprarenal) are located in the thoracic abdomen situated 'on' top of the kidneys one on each side, specifically on their anterosuperior aspect.
• They are surrounded by the adipose capsule and the renal fascia
• They consist of two parts,
The outer cortex
The inner medulla.
Adrenal Cortex
• The adrenal cortex is devoted to the synthesis of corticosteroid hormones from cholesterol.
It completes the hypothalamic-pituitary-adrenal axis
The source of cortisol and corticosterone hormones
• The cortex is divided into three zones, or layers.
• This division is sometimes referred to as ‘functional zonation”
Zona glomerulosa
Zona fasciculata
Zona reticularis
Adrenal Medulla
• The adrenal medulla is the core of the adrenal gland, and is surrounded by the adrenal cortex.
• The chromaffin cells of the medulla are the body's main source of the circulating catecholamines, adrenaline (epinephrine) and noradrenaline (norepinephrine
Blood supply to Adrenal Gland
• Although variations of the blood supply to the adrenal glands (and indeed the kidneys themselves) are common, there are usually three arteries that supply each adrenal gland:
The superior suprarenal artery is provided by the inferior phrenic artery.
The middle suprarenal artery is provided by the abdominal aorta.
The inferior suprarenal artery is provided by the renal artery
• Venous drainage of the adrenal glands is achieved via the suprarenal veins:
The right suprarenal vein drains into the inferior vena cava.
The left suprarenal vein drains into the left renal vein or the left inferior phrenic vein
Each kidney contains over 1 million tiny structures called nephrons. Each nephron has a glomerulus, the site of blood filtration. The glomerulus is a network of capillaries surrounded by a cuplike structure, the glomerular capsule (or Bowman’s capsule). As blood flows through the glomerulus, blood pressure pushes water and solutes from the capillaries into the capsule through a filtration membrane. This glomerular filtration begins the urine formation process.Inside the glomerulus, blood pressure pushes fluid from capillaries into the glomerular capsule through a specialized layer of cells. This layer, the filtration membrane, allows water and small solutes to pass but blocks blood cells and large proteins. Those components remain in the bloodstream. The filtrate (the fluid that has passed through the membrane) flows from the glomerular capsule further into the nephron.The glomerulus filters water and small solutes out of the bloodstream. The resulting filtrate contains waste, but also other substances the body needs: essential ions, glucose, amino acids, and smaller proteins. When the filtrate exits the glomerulus, it flows into a duct in the nephron called the renal tubule. As it moves, the needed substances and some water are reabsorbed through the tube wall into adjacent capillaries. This reabsorption of vital nutrients from the filtrate is the second step in urine creation.The filtrate absorbed in the glomerulus flows through the renal tubule, where nutrients and water are reabsorbed into capillaries. At the same time, waste ions and hydrogen ions pass from the capillaries into the renal tubule. This process is called secretion. The secreted ions combine with the remaining filtrate and become urine. The urine flows out of the nephron tubule into a collecting duct. It passes out of the kidney through the renal pelvis, into the ureter, and down to the bladder.The nephrons of the kidneys process blood and create urine through a process of filtration, reabsorption, and secretion. Urine is about 95% water and 5% waste products. Nitrogenous wastes excreted in urine include urea, creatinine, ammonia, and uric acid. Ions such as sodium, potassium, hydrogen, and calcium are also excreted
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Adrenal Gland
Content :- 1. Introduction, 2. location, 3.Structure, 4. Hormones and their function, Disease, Control.
For more such content refer to www.faunafondness.com
It is the review researches based presentation on the topic of "ADRENAL GLAND" in which i describes about anatomical, physiological and pathological aspects of material from different websites and pages from google scholars which i gave references at the end.
In mammals, the adrenal glands (also known as suprarenal glands) are endocrine glands that sit at the top of the kidneys. They are chiefly responsible for releasing hormones in response to stress through the synthesis of corticosteroids such as cortisol and catecholamines such as adrenaline (epinephrine) and noradrenaline. They also produce androgens in their innermost cortical layer. The adrenal glands affect kidney function through the secretion of aldosterone, and recent data (1998) suggest that adrenocortical cells under pathological as well as under physiological conditions show neuroendocrine properties; within normal adrenal glands, this neuroendocrine differentiation seems to be restricted to cells of the zona glomerulosa and might be important for an autocrine regulation of adrenocortical function.
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2. Adrenal glands are triangle-shaped glands located
on top of the kidneys.
Each gland consists of a medulla (the center of the
gland) which is surrounded by the cortex.
The medulla is responsible for producing
epinephrine and norepinephrine (adrenaline).
3. The adrenal cortex produces other hormones
necessary for fluid and electrolyte (salt) balance in
the body such as cortisone and aldosterone.
The adrenal cortex is composed of three areas:
@zona glomerulosa
@zona fasciculata
@zona reticularis
4.
5.
6. layer Name Primary product
Most superficial Zona glumerulosa Mineralcorticoids
cortical (e.g aldosterone)
layer
Middle corticol Zona fasciculata Glucocorticoids
layer (e.g cartisol)
Deepest cortical Zona reticularis Weak androgens
layer (e.g
adrenosterone)
9. Produced in the zona fasciculata.
The primary glucocorticoid released by the
adrenal gland in the human
is cortisol and corticosterone in many other
animals.
Its secretion is regulated by the
hormone ACTH from the anterior pituitary.
Main: Cortisol (hydrocortisone)
10. Essential for life and metabolism
Stress and circadian rhytm influences release
of these hormone.
11. It stimulates the release of amino
acids from the body
It stimulates lipolysis, the breakdown
of fat
It stimulates gluconeogenesis, the
production of glucose from newly-
released amino acids and lipids
12. It increases blood glucose levels in response to stress,
by inhibiting glucose uptake into muscle and fat cells
It strengthens cardiac muscle contractions
It increases water retention
It has anti-inflammatory and anti-allergic effects
13. They are produced in the zona glomerulosa.
The primary mineralocorticoid is aldosterone.
Aldosterone is secreted in response
- to high extracellular potassium levels
- low extracellular sodium levels
- low fluid levels and blood volume.
14. Aldosterone effect metabolism in 3 ways:
1)It increases urinary excretion of
potassium ions
2)It increases interstitial levels of
sodium ions
3)It increases water retention and
blood volume
16. The renin-angiotensin system (RAS) or the renin-
angiotensin-aldosterone system (RAAS) is a hormone
system that regulates blood pressure and water (fluid)
balance.
When blood volume is low, juxtaglomerular cells in the
kidneys secrete renin
Renin stimulates the production of angiotensin I, which
is then converted to angiotensin II that causes blood
vessels to constrict, resulting in increased blood
pressure.
17. Angiotensin II also stimulates the secretion of the
hormone aldosterone from the adrenal cortex.
Aldosterone causes the tubules of the kidneys to
increase the reabsorption of sodium and water into the
blood.
This increases the volume of fluid in the body, which
also increases blood pressure.
18. They are produced in the zona reticularis.
Androgens or androgenic steroids are produced by the
zona reticularis layer of the adrenal cortex.
Androgens, including testosterone are male sex
hormones.
It’s assist the development of male characteristics, and
proper development of male sex organs during embryonic
development.
19. There are usually three arteries that supply each
adrenal gland:
-The superior suprarenal artery is provided by the
inferior phrenic artery
-The middle suprarenal artery is provided by the
abdominal aorta
-The inferior suprarenal artery is provided by the
renal artery
20. Venous drainage of the adrenal glands is
achieved via the suprarenal veins:
-The right suprarenal vein drains into the inferior
vena cava
-The left suprarenal vein drains into the left renal
vein or the left inferior phrenic vein.