Endocrine System Embryology 1 Flashcards
From what tissue does the hypothalamus develop?
Ectodermal tissues (on day 32 the hypothalamic sulcus develops from the diencephalon)
What tissue invaginates to form the anterior lobe of the pituitary gland?
Ectodermal tissue of the oropharynx
This invagination is known as what?
The Rathke’s pouch, which eventually extends downward to the hypothalamus and becomes the pituitary stalk
From what does the posterior lobe of the pituitary gland arise?
The neural crest
What does the pancreas form from?
From two diverticular buds of the foregut
By what week have the first islets of the pancreas appeared?
Around week 10, they first appear in the tail of the pancreas.
From what tissue does the thyroid develop?
It starts developing in the primitive alimentary tract and consists of endodermal cells
Where does the thyroid first develop?
In the buccal cavity
What structure does the thyroid gland help to develop as it matures?
The tongue
What is embryonic connection do the tongue and thyroid share?
The thyroglossal duct
Where on the tongue does the thyroglossal duct open?
The foramen cecum
From which pouches do the parathyroid glands develop?
The superior gland descends from the fourth pharyngeal pouch and the inferior glands from the third pharyngeal pouch
True or false: The adrenal cortex and medulla develop from the same embryonic line
False, the cortex develops from coelomic mesodermal tissue and the medulla arises from ectodermal tissue of the neural crest
Between the adrenal cortex and the medulla, which develops parallel with the sympathetic nervous system?
The adrenal medulla (which secretes epinephrine, norepinephrine, and dopamine).
