anatomy of the thyroid gland Flashcards
what is the thyroid gland inferior to
inferior to thyroid cartilage of larynx
what is the thyroid gland anterior to
anterior to trachea
what two lobes does the thyroid gland have
right and left lobes
where are the left and right lobes of the thyroid gland connected at
at the midline
how are the left and right lobes of the thyroid gland connected at the midline
by narrow isthmus
what is the isthmus
bridge of tissue that crosses over the front windpipe
what gives the thyroid gland its reddish color
rich vascularization
what is the thyroid gland composed of
microscopic follicles
what are the microscopic follicles that compose the thyroid gland
follicular and parafollicular cells
what type of cells do follicular cells have
cuboidal epithelial cells
what are follicular cells
cuboidal cells that surround a central lumen
what do follicular cells synthesize
thyroglobulin TGB
what does thyroglobulin produce and release
thyroid hormone TH
what does the follicle lumen house
colloid
what is colloid
fluid that fills the follicles; rich in protein— thyroglobulin
what are parafollicular cells
cells between follicles
what do the parafollicular cells make
calcitonin
what does calcitonin do
decreases blood calcium levels
