Endocrine: 15.1: Thyroid Embryo. and Blood Supply Flashcards
The thyroid develops at the _____ and then travels along the thyroglossal duct to the anterior neck.
base of the tongue
Parafollicular, aka C cells, of the thyroid are derived from what embryological cells?
neural crest cells
What is the most common site for ectopic thyroid tissue?
the tongue (lingual thyroid)
What is a thyroglossal duct cyst? How does it occur? How does it present?
- cystic dilation of the thyroglossal duct remnant
- failure of the thyroglossal duct to involute
- a midline, anterior neck mass that moves with swallowing or protrusion of the tongue
Dx?
- persistence of thyroid tissue at the base of the tongue –> base of tongue mass
lingual thyroid
Sometimes the recurrent laryngeal nerve runs with the _____.
inferior thyroid artery
The thyroid ima artery is a branch of the _____ artery.
subclavian
From where does the inferior thyroid artery arise?
from the thyrocervical trunk
What is the remnant of the thyroglossal duct in an adult?
the foramen cecum
What is the main blood supply to the thyroid? What is this a branch of?
- the superior thyroid artery
- a branch of the internal carotid artery
The external branch of the superior laryngeal nerve runs with the ______.
superior thyroid artery
Sometimes the _____ runs with the inferior thyroid artery.
recurrent laryngeal nerve
The thyroid develops at the base of the tongue and then travels along the _____ to the anterior neck.
thyroglossal duct
The _____ runs with the superior thyroid artery.
external branch of the superior laryngeal nerve
From what germ layer is the thyroid derived from?
endoderm
