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53 Cards in this Set
- Front
- Back
Endocrine and exocrine glands are derived from?
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embryonic epithelium
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Do endocrine or exocrine glands loose conncetion with epithelium of orgin?
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Endocrine glands
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What two ectoderm primordia derive the pituitary gland
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Oral extoderm (Rathke's Pouch) and Neural Ectoderm (Infundibulum)
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What week does Rathke's pouch lose its connection with the oral cavity
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Week 8
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Remnants of Rathke's pouch (pharyngeal hypophysis) may lead to?
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Carniopharyngioma
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Midline invagination of pharyngeal endoderm
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Thyroid orgins
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What week is the thyroid first visible?
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week 4
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Found anywhere along path of thyroid displacement, commonly at base of tongue
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Aberrant thyroid tissue
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Parathyroid gland forms from what pharyngeal pouches?
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3 and 4; superior pair originate from dorsal wing of 4th pouch and inferior pair form from dorsal wing of 3rd pouch
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What week are parathyroid glands recognizable
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week 5
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Thyroid follicular cells are derived from
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Thyroid diverticulum (endoderm)
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Parafollicular cells (C cells) are derived from
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Neural crest from ultimopharyngeal body
C-cells produce calcitonin which decrease serum Calcium |
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The infundibulum of Rathke's pouch forms
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Pituitary stalk and posterior lobe
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The posterior wall of Rathke's pouch forms
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Pars intermedia
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Superior extension (of anterior lobe) of Rathke's Pouch forms; What week does this form
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Pars tuberalis; week 11
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Anterior wall of Rathke's pouch forms
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Anterior lobe, pars distalis
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Precursor of Pituitary Gland
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Ectoderm
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Precursor of thyroid gland
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Endoderm of pharynx, displaced ventrally (C cells from neural crest)
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Precursor of Parathyroid gland
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Endoderm of pharynx displaced ventrally
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Precursor of Adrenal Gland
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Mesoderm (Cortex) (the medulla is from neural crest)
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The fetal adrenal cortex is stimulated by
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HcG from the trophoblasts
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When does the definitive adrenal gland reach normal size?
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when the Child is 2
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Congenital Adrenal Hyperplasia
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enzyme (commonly 21-hydroxylase) needed to make cortisol and/or aldosterone is mutated so steroid pathway is shunted toward androgens --> enlarged adrenal cortex (due to incr ACTH), boys get early devo of secondary sex characteristics, girls get enlarged clitoris/ambiguous genitalia
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At what week is LH/FSH, GH present
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week 10
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What week is the Pouch connection with oral cavity lost?
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week 8
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At what week are the thyroid follicles visible?
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Week 10
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What week is thyroid hormone produced?
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week 12
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What week does the throglossal duct close?
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Week 11
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At what week does the adrenal cortex forn
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Week 4
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A cells
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Glucagon
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B cells
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Insulin
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D cells
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Somatostatin
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F cells
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Pancreatic Polypeptide
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Chief cells in parathyroid
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More abundant than oxyphil cells
Make PTH |
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Follicular cells histology
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Simple cuboidal wall of colloid follicle
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Histology of thyroid with low TSH
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squamous epithelium, high colloid (colloid goiter)
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Histology of thyroid with High TSH
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Columnar epithelium, low colloid (parenchymatous goiter)
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Zona glomerulosa
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primary controlled by renin angiotensin
Secretes aldosterone |
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Zona fascuculata
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Controlled by ACTH and CRH
Secretes cortisol and sex hormones |
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Zona Retucularis
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Stains dark
Controlled by ACTH and CRH Secretes Sex hormones |
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Adrenal Medulla
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Controlled by Pre-ganglionic sympathetic fibers
Secretes Norepinephrine and Epinephrine |
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For group 1 hormones (aka steroids, iodothyronines)
List: solubility, transport, 1/2 life, receptor location, and mediator |
Lipophilic
Transport proteins Long (hrs-days) Intracellular receptor Receptor-hormone complex |
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For Group 2 hormones (polypeptides, proteins, catecholamines, glycoproteins)
List: solubility, transport, 1/2 life, receptor location, and mediator |
Hydrophilic
NO transport proteins Short half life Plasma membrane receptor cAMP, cGMP. Ca++,kinase cascades |
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List the parts of the pituitary
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From top to bottom:
Pars distalis (adenohypophysis) (more blood vessels) Pars intermedia Pars nervosa (neurohypophysis) (has pituicytes present) |
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Pancreatic islet (of Langerhans)
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From left to right: medulla, zona reticularis, zona fasciculata, zona glomerulosa, capsule
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What part of the adrenal cortex?
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Zona fasciculata
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What part of the adrenal cortex?
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Zona Reticularis
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What part of the adrenal cortex?
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Zona Glomerulosa
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Name cells from left to right
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In parathyroid
Two Chief cells Oxyphil cell |
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In thryroid
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C-cell cluster
Pink centers are colloid that are surrounded by follicular cells |
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follicular epithelium?
amount of colloid? Treatment? |
Columnar (normal is cuboidal)
Low colloid Treated with propylthiouracil (blocks thyroperoxisase activity) |
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follicular epithelium?
amount of colloid? Treatment? |
Squamous
High colloid One month after pituitary removal (no TSH-->no T4 release from thyroid colloid) |