hypothalamus, pituitary, para/thyroid
DESCRIPTION
Glands and its hormonesTRANSCRIPT
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ENDOCRINOLOGYPRESENTED BY:
PRINCESS ALEN I. AGUILAR
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Hypothalamus
• Regulates the anterior pituitary gland’s release of hormones that stimulate other endocrine glands to release hormones.
• The hypothalamus controls the autonomic nervous system.The autonomic nervous system is the
portion of the nervous system responsible for maintaining homeostasis.
Thus, damage to the hypothalamus results in severe imbalances in the internal environment.
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Hypothalamus• The hypothalamus contains the thirst center, the hunger
center and the body's thermostat.Thus, damage to the hypothalamus frequently results in
water, glucose and temperature imbalances.• The hypothalamus controls the hypophysis (pituitary
gland, so it controls almost endocrine glands).The hypophysis is the most important endocrine gland in
the body and is often referred to as the "master gland“, because it controls most of the other endocrine glands in the body such as the thyroid, adrenal gland, testis and ovaries.
• The hypothalamus is the site of emotions and the effect emotions can have on the body
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Pituitary Gland
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Pituitary Gland
• Anterior Pituitary Gland• AKA Adenohypophysis
• Enclosed in a capsule of dense collagenous connective tissue consist largely of epithelial tissue organized in blocks around many thin walled vessels.
• Secrete six hormones
• AKA Hypophysis• Attached to the
hypothalamus• 1cm in diameter &
consist of an anterioir and posterior pituitary
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Anterior Pituitary Gland Hormones
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Anterior Pituitary Gland Hormones
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Pituitary Gland
• AKA Neurohypophysis• Consist mainly of nerve
fibers and neuroglial cells unlike APG-Glandular EC
• Hormones secreted are originally from hypothalamus but this is where the hormones enter the blood stream.
• As hypothalamus regulates the ADH release from the Posterior Pit. Gland, osmoreceptors are the one responsible in sensing the osmotic pressure in the body fluids.
Posterior Pituitary Gland
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Posterior Pituitary Gland’s HormonesCONTROL OF SECRETION PRINCIPAL ACTIONS
Neurosecretory cells of hypothalamus secrete OT in response to uterine distention and stimulation of nipples
Stimulates contraction of smooth muscle cells of uterus during childbirth; stimulates contraction of myoepithelial cells in mammary glands to cause milk ejection
Neurosecretory cells of hypothalamus secrete ADH in response to elevated blood osmotic pressure, dehydration loss of blood volume, pain or stress; inhibitors of ADH secretion include low blood osmotic pressure , high blood volume, and alcohol
Conserves body water by decreasing urine volume decreases water loss through perspiration; raises blood pressure by constricting arterioles.
*AKA arginine vasopressin
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Hormonal Disorders
HYPOSECRETION
• INADEQUATE RELEASE OF A HORMONE
HYPERSECRETION
• EXCESSIVE RELEASE OF HORMONE
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Pituitary Gland DisordersPITUITARY DWARFISM
• Hyposecretion of GH during the growth years slows bone growth, and the epiphyseal plates close before normal height is reached. Other organs of the body are also failed to grow.
GIANTISM
• Hypersecretion of GH during childhood; abnormal increase in the length of the long bones.
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Pituitary Gland Disorders
ACROMEGALY
• Hypersecretion of GH during the adulthood; it contribute to the thinkening of bones in the hands, feet, cheeks, jaws.
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Pituitary Gland DisordersDiabetes insipidus
• The most common abnormality associated with dysfunction of the posterior pituitary.
• Diabetes= overflow• Insipidus= tasteless• Due to defect in ADH
receptors or an inability to secrete ADH.
• NEUROGENIC DI• Results from hyposecretion
of ADH, usually caused by brain tumor, head trauma or brain surgery.
• NEPHROGENIC DI• The kidney do not respond
to the ADH. Receptors maybe non-functional or the kidney may be damaged.
• Sx- Dehydration• Tx-Hormonal replacement
Restrcition from salt in the diet & use of diuretic drugs
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THYROID GLAND
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THYROID GLAND
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THYROID GLAND’S HORMONES
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THYROID GLAND DISORDERSCONGENITAL
HYPOTHYROIDISM
• Hyposeecretion of thyroid hormones that is present at birth
• Previously termed cretinism, this condition causes several mental retardation and stunted bone growth.
• Tx• Oral thyroid hormone must be
started soon after birth and continued for life upon diagnosis of having the disease
MYXEDEMA
• Hypothyroidism during the adulthood years.
• Hallmark is edema that causes facial tissues to swell and look puffy
• No mental retardation but person may be less alert.
• Tx• Oral thyroid hormones
reduce the Symptoms
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THYROID GLAND DISORDERSGRAVE’S DISEASE
• The most common form of hyperthyroidism which also occurs seven to ten times more often in the females than in males, usually before 40 years old.
• An Autoimmune disorder in which the person produces Ab that mimic the action of TSH.
• Patients often have exophthalmos-edema behind the eyes
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THYROID GLAND DISORDERSGOITER
• Is simply an enlarged thyroid gland. It may be associated with hyper or hypo or euthyroidism, which means norml secretion of thyroid hormone- dietary iodine intake is inadequate thus low levels of thyroid hormone consequently, stimulates secretion of TSH.
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PARATHYROID GLAND
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PARATHYROID GLAND
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PARATHYROID GLAND’S HORMONE
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PARATHYROID GLAND DISORDERSHYPOPARATHYROIDISM
• Too little parathyroid hormone-leads to a deficiency of blood Ca2+, which causes neurons and muscle fibers to depolarize and produce action potentials spontaneously.
• Leading cause is accidental damage or their blood supply during thyroidectomy surgey
HYPERPARATHYROIDISM
• An elevated level, most often is due to a tumor of one of the parathyroid glands.
• Will results to excessive resorption of bone matrix, raising the blood levels of calcium and phosphate ions and causing bones to become soft and easily fractured.
• High Calcium level promotes formation of kidney stones. Fatigue, personality changes and lethargy may also occur.
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