Endocrine (Handout) Flashcards
The internal supporting framework is composed of what kind of tissue?
A. Reticular
B. Muscular
A. Reticular
Secretions of the endocrine glands are called
Hormones
Glands of the endocrine system that are ectodermal in origin
Pituitary gland
Pineal gland
Adrenal medulla
Glands of the endocrine system that are mesodermal in origin
Adrenal cortex
Leydig cells of the testis
Theca interna cells of the ovary
Glands of the endocrine system that are endodermal in origin
Thyroid gland
Parathyroid gland
Islets of Langerhans
Parafollicular cells or C-cells
Pituitary gland is developed from what sources?
Rathke’s pouch
Infundibulum
Ectodermal outpocketing of the stomodeum
Rathke’s pouch
Gives rise to the adenohypophysis
Rathke’s pouch
The anterior wall of the adenohypophysis forms what structure/s?
Pars distalis
Pars tuberalis
The posterior wall of the adenohypophysis forms what structure/s?
Pars intermedia
Downward extension of the diencephalon
Infundibulum
The infundibulum gives rise to the?
Neurohypophysis
The neurohypophysis gives rise to what structure/s?
Pars nervosa
Infundibular stem
Median eminence of tubercinereum
Pars nervosa is also known as
Infundibular process
The pituitary gland is also known as
Hypophysis cerebri
The pituitary gland lies below the brain in the cavity of the sphenoid bone known as
Sella turcica
Connects the hypophysis to the base of the base of the brain
Infundibulum stalk
The hypophysis is covered by a capsule of
A. Dense CT
B. Loose CT
A. Dense CT
What are the two divisions of the hypophysis
Adenohypophysis
Neurohypophysis
Also known as the anterior pituitary
Adenohypophysis
What are the subdivisions of the anterior pituitary?
Para distalis
Pars intermedia
Para tuberalis
Largest subdivision of the adenohypophysis
Para distalis
What are the two cell types that can be found in pars distalis
Chromophils
Chromophobes
Type of cell in pars distalis that has the affinity to stains? What are the subtypes?
Chromophils
Subtypes: acidophils, basophils
Acidophils secrete A. Prolactin B. GH C. FSH D. Both a and b E. both b and c
D. Both a and b - prolactin and growth hormone
Basophils secrete?
FSH
LH
TSH
ACTH
Smallest and least numerous among the cells in the para distalis
Chromophobes
Chromophobes are referred to as __________ cells since some may differentiate into acidophils and basophils as need arises
Reserve cells
Found between the pars distalis and the infundibular process
Para intermedia
Characterized by the presence of follicles or cysts filled with colloid and lined by columnar epithelium
Para intermedia
Follicles or cysts filled with colloid that is lined by columnar epithelium found in para intermedia
Rathke’s cyst
Hormone of the para intermedia
Melanocyte stimulating hormone
In what layer of the adenohypophysis can you find polygonal basophilic cells
Para intermedia
Hormone that causes dispersion of melanin pigments in the melanoblast and increases skin pigmentation
Melanocyte stimulating hormone
Most highly vascularized portion of the hypophysis
Para tuberalis
Portion of the hypophysis formed of longitudinal columns or cords of cells that descend towards the pars distalis
Pars tuberalis
What are the types of cells found in pars tuberalis
Undifferentiated cells
Small basophils and acidophils
What are the hormones secreted by pars tuberalis?
None
It is thru the _________________ that the releasing hormones from hypothalamus reach the secretory cells of the pars distalis
Hypophyseal portal curculation
Formed of venules that connect the capillaries in the median eminence with the capillary sinusoids in the pars distalis
Hypophyseal system
Neurohormones from hypothalamus reach the ___________ through nerve fibers
Para distalis
Blood supply of hypophysis
Superior hypophyseal arteries
Branches of internal carotid
Branches of Posterior Communicating artery
The neurohypophysis is formed of unmyelinated netve fibers of the _______________
Hypothalamo-hypophyseal tract
Cells with numerous processes and are considered as modified neuroglial cells
Pituicytes
Cells found in the neurohypophysis, part of the pars nervosa
Pituicytes
Neurosecretory materials secreted by the neurons in the hypothalamic nuclei and ate stored and released from the axolemma of the nerve fibers
Herring bodies
Small, spherical structures containing neurohormones stored in the pars nervosa or in the infundibular process
Herring bodies
What are the hormones that can be found in the infundibular process or para nervosa
Pitocin/ oxytocin
Pitressin/ ADH
Oxytocin is also known as
Pitocin
Hormone that stimulates uterine contraction
Pitocin or oxytocin
Oxytocin is secreted by what nuclei of the hypothalamus?
Paraventricular nuclei
What hormone is secreted by the paraventricular nuclei of the hypothalmus
Oxytocin
What hormone is secreted by the supraoptic nuclei of the hypothalamus
Pitressin or ADH
Hormone that increases water retention
ADH or pitressin
ADH is secreted by what nucleus of the hypothalamis
Supraoptic nuclei
Develops from the epithelial proliferation in the floor of the pharynx between the tuberculum impar and copula
Thyroid gland
The space between the tuberculum impar and copula is later referred as
Foramen cecum
Narrow canal that connects the thyroid gland to the tongue
Thyroglossal duct
Cystic remnant of the thyroglossal duct is called
Thyroglossal cyst
Cystic remnant of the narrow canal that connects the thyroid gland to the tongue
Throyglossal cyst
5th pharyngeal pouch gives rise to the
Ultimobranchial body
The ultimobranchial body gives rose to what cells
Parafollicular or C cells
Parafollicular or C cells secrete what hormone
Calcitonin
Connects the two lobes of the thyroid gland
Isthmus
Structural unit of the thyroid gland
Follicles
-spherical cystlike
Follicles are lined by what kind of epithelium
Simple cuboidal
Epithelial cells surrounding the follicles vary in height in terms of activity. Hypoactive? Hyperactive?
Squamous when the gland is hypo active. Columnar when hyperactive
Cells in the thyroid glands between follicular cells and the basal lamina or between the thyroid follicles
Parafollicular cells
C cells produce what hormone
Calcitonin
Also known as the c cells
Parafollicular cells
Other names of the C cells
Light cells
Mitochondria-rich cells
Ultimobranchial cells
Cells of the thyroid gland responsible for regulation of metabolic rate
Follicular epithelial cells
Parathyroid gland develops from
Superior and inferior parathyroid
Dorsal wing of the 4th pharyngeal pouches
Superior parathyroid
Dorsal wing of the 3rd pharyngeal pouches
Inferior parathyroid
Small, yellow brown oval bodies adhering to the posterior surface of the thyroid gland
Parathyroid gland
What separates the parathyroid to the thyroid gland
Connective tissue capsule
The parenchyma of parathyroid gland is composed of what cells
Principal/chief cells
Oxyphil cells
Cell of the parathyroid gland that only appears at the end of the first decade of life until puberty
Oxyphil cells
Cell of the parathyroid gland with basophilic cytoplasm
Principal/chief cells
Cell of parathyroid gland with acidophilic cytoplasm
Oxyphil cells
Gland that regulates calcium concentration by stimulating resorption of bone and reabsorption of calcium
Parathyroid gland
PTH is secreted by what cell of the parathyroid gland
Principal cell
PTH secretion will _______ blood calcium levels
A. Increase
B. Decrease
A. Increase
In what week of development will the adrenal cortex start to form
5th week of development
About the 5th week of development, MESOTHELIAL cells proliferate and later differentiate to form what?
Primitive or fetal cortex of the adrenal gland