Flashcards in Thyroid: Science and Diseases Deck (131)
Where do the thyroid lobes attach?
thyroid and cricoid cartilages
Which cartilages does the thyroid attach? Which is superior and which is inferior?
Thyroid (superior), Cricoid (inferior)
Where does the isthmus of the thyroid gland lie?
2-3rd tracheal cartilages -- C5-T1 vertebrae
Where does the thyroid gland originally develop?
between the anterior and posterior parts of the tongue, where the foramen caecum is found in adults
How does the thyroid migrate to its adult location?
via the thyroglossal duct - around week 7
Working anteriorly to posteriorly, what is the first level of fascia found at the neck?
What does the superficial fascia of the neck contain?
Working anteriorly to posteriorly, what is found after the superficial fascia in the neck?
anterior investing fascia
What does the anterior investing fascia contain?
the sternocleidomastoid muscles
Working anteriorly to posteriorly, what is found after the anterior investing fascia in the neck?
What is found within the pretracheal fascia? (5)
strap muscles, trachea, oesophagus, recurrent laryngeal nerves, thyroid gland
What is found bilaterally to the pretracheal fascia in the neck?
What is found within the carotid sheath? (4)
internal jugular vein, deep cervical lymph nodes, vagus nerves, carotid arteries
Which fascia is found beyond the pre-tracheal fascia?
What is found within the pre-vertebral fascia?
c-vertebrae, postural neck muscles
What muscle is found within the posterior investing fascia?
the trapezius muscles (bilaterally)
Which arteries supply the thyroid gland? (2)
superior and inferior thyroid arteries
What are the origins of the superior and inferior thyroid arteries?
superior - external carotid; inferior - branch of subclavian
Which veins does the thyroid gland drain? (3)
the superior (2), middle (2) and inferior thyroid (1) veins
Where do the veins from the thyroid gland drain?
superior and middle --> internal jugular --> brachiocephalic; inferior --> brachiocephalic
Which lymph nodes does the thyroid gland drain into? (4)
the inferior pretracheal node; paratrachial nodes; superior deep cervical nodes and deep cervical nodes
Which aortic arch is the subclavian artery formed from?
Which aortic arch is the arch of the aorta formed from?
Name the 4 strap muscles
Omohyoid, sternohyoid, sternothyroid, thyrohyoid
What 3 things does the thyroid gland secrete?
T4 (thyroxine), T3 (triiodothyronine), calcitonin
What naturally causes an increase in the size of the thyroid gland?
menstruation and pregnancy
Innervation of the thyroid gland (2)
ANS including Vagus nerve (Parasympathetic) and the sympathetic trunk
Describe the structure of the thyroid gland
follicles surround by follicular cells; parafollicular C cells found dotted about
What is found within the follicle of the thyroid gland?
colloid - tyrosine containing thyroglobulin