Anatomy and Embryology Flashcards
Where does the thyroid diverticulum arise from and where does it descend to?
Arises from the floor of the primitive pharynx and descends into the neck (p.286)
How is the thyroid connected to the tongue in the embryonic stage?
Connected to the tongue by the thyroglossal duct (p.286)
What does the thyroglossal duct persist as if it does not disappear?
As the pyramidal lobe of the thyroid (p.286)
What is the normal renmant of the thyroglossal duct?
The foramen cecum (p.286)
What is the most common site of ectopic thyroid tissue?
The tongue (p.286)
Describe the findings associated with a thyroglossal duct cyst.
An anterior midline mass that moves with swallowing (p.286)
Describe the findings associated with a branchial cleft cyst.
A persistent cervical sinus in the lateral neck (p.286)
Describe the components of the fetal adrenal gland.
Consists of an outer adult zone and an inner active fetal zone (p.286)
What is the function of the adult zone of the fetal adrenal gland?
Secretion of cortisol late in gestation (p.286)
When is the adult zone of the fetal adrenal gland active?
Adult zone is dormant early in fetal life but begins to secrete cortisol late in gestation (p.286)
What is the contribution of cortisol to fetal maturity?
Cortisol is responsible for fetal lung maturation and surfactant production (p.286)
How is cortisol secretion controlled in the fetal adrenal gland?
Controlled by ACTH and CRH from the fetal pituitary and placenta (p.286)
What is the embryological origin of the adrenal cortex?
Mesoderm (p.286)
What is the embryological origin of the adrenal medulla?
Neural Crest (p.286)
What is the primary regulating system of the zona glomerulosa?
Renin-Angiotensin system (p.286)
