Thyroid And Parathyroid Glands- Taylor Flashcards
What surrounds the thyroid gland?
Pretracheal fascia
What’s the isthmus and where is it located?
Connects the right and left lobes of the thyroid
Extends across the trachea anteriorly
What is the pretracheal fascia made of and what does it do?
A sheath of dense regular CT
Compartmentalizes trachea, esophagus, and thyroid
Holds thyroid and parathyroid in place
What type of sheath does the pretracheal fascia blend with posteriorly?
Carotid sheath
Where are the superior and inferior parathyroid glands located?
Posterior surface of thyroid gland
The external carotid artery branches to supply :
: superior thyroid and parathyroid glands
The thyrocervical artery (branch of the subclavian) supplies the :
: inferior thyroid and parathyroid glands
The internal jugular vein drain the :
Superior and middle thyroid branches
The brachiocephalic (mostly the left one) veins drain the:
: Inferior thyroid branches
Then drains to superior vena cava
Why is the thyroid gland highly vascularized?
It’s an endocrine gland
How is the thyroid gland innervated?
Cervical sympathetic ganglia forms a plexi around the thyroid arteries
- this regulates hormone release from glands
From what is the thyroid gland derived?
Endoderm of the developing oral cavity, especially the tongue
What is the foramen cecum?
Where endodermal tissue invaginated to form the thyroid gland
How did the thyroid gland become an endocrine gland?
The thyroglossal duct breaks down, so the thyroid gland becomes an endocrine gland releasing its contents into the bloodstream
What are the rare developmental leftovers associated with the thyroid gland?
A pyramidal (third) lobe Existing thyroglossal duct
