Endocrine Pathology Flashcards
Functions of the endocrine system include: (4)
- maintain metabolic equilibrium (homeostasis)
- secrete chemical messengers (hormones)
- regulate activities of various organs
- process of feedback inhibition
Maintaining metabolic equilibrium:
Homeostasis
chemical messengers:
hormones
In the process of feedback inhibition, increased activity of target tissue, typically ______ the activity of the gland secreting the stimulating hormone
down regulates
diseases of under/overproduction of hormones
endocrine diseases
Endocrine disease are associated with the development of:
mass lesions
What are the three classification of endocrine diseases?
- too little
- toot much
- others: tumors
Tumors of endocrine glands, whether benign or malignant, may secrete the hormone native to the gland, these tumors are said to be:
functional tumors
With functional tumors of endocrine glands, it may be the _____ of the tumor or the _____ that calls attention to the tumor
mass effect; metabolic effect of the excessive hormone
List the endocrine organs: (6)
(excluding testicles, ovaries, thymus, pineal gland, hypothalamus)
- anterior pituitary
- posterior pituitary
- thyroid
- parathyroid
- pancreas
- adrenal glands
Where is the pituitary gland located?
base of brain sella-turcica
The pituitary gland is connected to the:
hypothalamus
The pituitary gland is connected to the hypothalamus by:
-stalk composed of axons
-venous plexus
What is the function of the pituitary gland?
Central role in regulation of other endocrine glands
What are the two components of the pituitary gland?
- anterior lobe (adenohypophysis)
- posterior lobe (neurohypophysis)
What part of the pituitary gland is the adenohypophysis?
anterior lobe
What part of the pituitary gland is the neurohypophysis?
posterior lobe
Disease of the pituitary gland are categorized base on:
the lobe they are mainly effecting
Label the following image:
a) pons
b) midbrain
c) hypothalamus
d) pituitary gland
What can be seen in the following image?
Pituitary gland
Label the following image:
a) hypothalamus
b) anterior pituitary (adenohypophysis)
c) posterior pituitary (neurohypophysis)
What are the different types of cells in the anterior pituitary?
- somatotrophs
- lactotrophs
- corticotrophs
- thyrotrophs
- gonadotrophs
Describe what the following cell of the adenohypophysis produces:
- somatotrophs
- lactotrophs
- corticotrophs
- thyrotrophs
- gonadotrophs
- growth hormone (GH)
- prolactin
- adrenocorticotrophic hormone (ACTH)
- thyroid stimulating hormone (TSH)
- Follicle stimulating hormone (FSH) & Lutenizing hormone (LH)
- growth hormone (GH)
- prolactin
- adrenocorticotrophic hormone (ACTH)
- thyroid stimulating hormone (TSH)
- Follicle stimulating hormone (FSH) & Lutenizing hormone (LH)
The following hormones are produced in the:
Anterior pituitary gland (adenohypophyisis)
What hormones are produced in the posterior pituitary?
- antidiuretic hormone (ADH, Vasopressin)
- Oxytocin
- antidiuretic hormone (ADH, Vasopressin)
- Oxytocin
The following hormones are produced in the:
posterior pituitary (neurohypophysis)
What is the function of the following hormone:
Growth hormone (GH)
Tissue growth
What is the function of the following hormone:
TSH
Stimulates thyroid to produce thyroid hormones
What is the function of the following hormone:
ACTH
Acts on the adrenal gland to produce cortical hormones
What is the function of the following hormones:
FSH & LH
Act on the testes to produce testosterone & sperm
Act on the ovaries to produce the ova, estrogen & progesterone
What is the function of the following hormone:
Prolactin (PRL)
Acts on breast glandular tissue
What is the function of the following hormone:
Oxytocin
Acts on uterus for uterine contraction
Functions in lactation
What is the function of the following hormone:
ADH
Acts on kidney to stimulate water reabsorption
Diseases of the anterior pituitary include: (2)
- hypopituitarism (decreased secretion of trophic hormones)
- hypoerpituitarism (increased secretion of trophic hormones)
Disease of the anterior pituitary in which there is a decreased secretion of trophic hormones:
hypopituitarism
Disease of the anterior pituitary in which there is an increased secretion of trophic hormones:
hyperpituitarism
What are the characteristics of hypopituitarism:
destructive lesions/processes
give some examples of what might cause hypopituitarism:
-ischemia
-radiation
-inflammation
-neoplasms
What are the characteristics of hyperpituitarism:
functional adenoma within the anterior lobe with local mass effects
What are some of the local mass effects involved in hyperpituitarism?
-enlargement of the sella turcica
-visual field abnormalities
-increased intracranial pressure
-Pituitary adenomas
-radiation treatment
-neurosurgery
-sheehan syndrome
These are all potential causes of:
hypopituitarism
Ischemic necrosis of the pituitary gland:
Sheehan syndrome (may cause hypopituitarism)
What are the clinical manifestations of hypopituitarism? (6)
- pituitary dwarfism
- amenorrhea & infertility
- low libido & impotence
- postpartum lactation failure
- hypothyroidism
- hypoadrenalism
- pituitary dwarfism
- amenorrhea & infertility
- low libido & impotence
- postpartum lactation failure
- hypothyroidism
- hypoadrenalism
These are the clinical manifestations associated with:
hypopituitarism
-pituitary adenomas
-pituitary hyperplasia
-pituitary carcinomas
-hypothalamic disorders
These are all potential causes of:
Hyperpituitarism
What are the clinical manifestations of hyperpituitarism? (3)
- gigantism
- acromegaly
- cushing disease
-condition of hyperpituitarism
-excess growth hormone
gigantism
Gigantism is caused by ______ which produces excess growth hormone
primary tumor
The primary tumor of gigantism is an:
adenoma of the AP
What is the second most common anterior pituitary syndrome?
gigantism
What type of tissues are affected in gigantism?
all growing tissues
Gigantism occurs:
before growth plate closure
List the symptoms associated with gigantism: (7)
- generalized overgrowth (3 standard deviations)
- headaches
- chronic fatigue
- arthritis & osteoporosis
- muscle weakness
- hypertension
- CHF
-condition of the anterior pituitary with excess GH
-late diagnosis
-poor vision (photophobia)
-enlarged skull, hands, feet, ribs
-soft tissues, viscera
-enlarged maxilla, mandible, nasal & frontal bones, & maxillary sinus
-intraoral manifestations
acromegaly
Describe the intraoral manifestations of acromegaly: (5)
- diastemas
- malocclusion
- macroglossia
- enlarged lips
- sleep apnea
Diabetes insipidus (central) is a disease involving the:
posterior pituitary
What are two symptoms associated with diabetes insidipidus (central)?
- polyuria (also dilute urine)
- polydipsia
Diabetes insipidus (central) is due to irregularities of what hormone?
Secretions of inappropriately high levels of ADH (SIADH)
The secretion of inappropriately high levels of ADH (SIADH) seen in diabetes insipidus (central) may cause:
- hyponatremia
- cerebral edema
- neurologic dysfunction
- increased total body water
Describe the increased total body water seen in diabetes insipidus (central): (2)
- blood volume normal
- no peripheral edema
Iodide from a normal diet is stores in the _______ (bound to _____) and used for production of ____ & _____
thyroid gland; thyroglobulin; T3 & T4
T3 & T4 have identical chemical compositions except for:
addition of one iodide (in T4)
____ is produced exclusively by the thyroid while majority of _____ is the result of ____ conversion
T4; T3; T4
_____ is the activator for synthesis of TSH
TRH (Thyrotropin releasing hormone)
TRH is the activator for synthesis of:
TSH
____ is the activator for T3 & T4 production
TSH (Thyroid stimulating hormone)
-T3/T4 levels are low
-elevation in ____ levels
-increase in T3/T4 production
TSH
TRH controls _____ production
TSH
TSH controls _____ production
T3 & T4
The three glands responsible for thyroid function include:
- hypothalamus
- pituitary
- thyroid
A very small amount of T3 & T4 is not bound to ______ and remains _____
thyroxine binding proteins; free in circulation
What form of T3 & T4 are metabolically active?
The small percentage of each that are free in circulation (not bound)
What is the affect on basal metabolic rate with:
- decreased T3 & T4
- increased T3 & T4
- Decreased BMR
- Increased BMR
Low levels of T3 & T4 have what effect on gluconeogenesis & glycogenolysis?
Decreased gluconeogenesis & decreased glycogenolysis