Flashcards in 10.1 Development of Midline Structures Deck (19):
1
Where is the pituitary gland located?
Pituitary fossa
2
What are the different functions of the two lobes?
Anterior (endocrine)
Posterior (neuroendocrine)
3
What is the first stage of pituitary gland formation?
Out-growth of forebrain called the infundibulum
4
What is the second stage of pituitary gland formation?
Rathke's pouch formation. Invagination of the oropharynx which grows towards the infundibulum
5
What does Rathke's pouch become?
Anterior pituitary
6
What does the infundibulum become?
Posterior pituitary and stalk
7
Which parts of the tongue does the 1st pharyngeal arch contribute to?
2 lateral lingual swellings and tuberculum impar
8
Which parts of the tongue does the 2nd and 3rd pharyngeal arches contribute to?
Cupola
9
Which parts of the tongue does the 4th pharyngeal arch contribute to?
Epiglottal swelling
10
What happens to the arch derivatives as the tongue starts to develop?
Lateral lingual swellings grow over tuberculum impar
3rd pharyngeal arch component of cupola grows over 2nd arch component
Extensive degeneration to free the tongue from the floor of the oral cavity
11
Which nerves supply general sensory innervation to the anterior 2/3rds of the tongue?
Trigeminal and Glossopharyngeal
12
Which nerves supply general sensory innervation to the posterior 1/3rds of the tongue?
Glossophayngeal and Vagus
13
What nerve innervates the taste buds in the tongue?
Chorda tympani
14
Which nerve innervates the muscles of the tongue?
Hypoglossal
15
Where does the primordium of the thyroid gland appear?
Floor of the pharynx between tuberculum impar and cupola
16
What connects the thyroid gland to the tongue as it descends through the neck?
Thyroglossal duct
17
Where does the thyroid end up?
Pouch of 4th pharyngeal arch
18
What is 1st arch syndrome?
Spectrum of defects in the development of 1st arch derivatives. Failure of colonisation of 1st arch with neural crest cells
19