Pharynx

Question 1

What are the 3 sub divisions of pharyx?

Answer 1

Naso, Oro and laryngo

Question 2

what are the borders of nasopharynx and what does it contain

What is the lining?

Answer 2

base of skull to soft palate
contains andenoid tonsils, which enlarge between 3-8 years of age.
Lined by ciliated pseudostratified columnar epithelial

Question 3

what are the borders of oropharynx?

what does it contain?

Answer 3

soft palate to superior border of epiglottis

Contains: posterior 1/3 tongue, lingual tonsils, palatine tonsils and superior constrictor muscles.

Question 4

What are the borders of laryngopharnyx? what does it contain?

Answer 4

superior border of epiglottis to inferior border of circoid cartilage
- contains pharyngeal constrictors

Question 5

what is a pharngeal diverticulum? where does it form?

Answer 5

uncordinated relaxation of circophrayngeous after thyrophrayngeus contract - increased the intrapharyngeal pressure and cause phrayngeal mucosal to form a diverticulum (pouch)

Question 6

What are the 3 circular pharyngeal constrictor muscles? where are the located

Answer 6

• superior pharnyngeal constrictor (Oro)
• middle pharyngeal constrictor (laryngo)
• inferior pharyngeal constrictor (layrngo

Question 7

how does the circular muscles contract?

Answer 7

sequentially from superior to inferior to constrict the lumen and propel the bolus of food inferiorly into the oesophagus.

Question 8

What nerve innervated pharyngeal constrictors?

Answer 8

vagus nerve

Question 9

What are the 3 longitudinal muscles? and theyre innervation

Answer 9

• Stylopharyngeus (glossophrayngeal nerve)
• platopharyngeous (vagus)
• salpingopharyngeus (vagus)

Question 10

Where does the pharynx receive sensory innervation from?

Answer 10

glossopharyngeal nerve

Question 11

motor innervation of pharynx

Answer 11

all vagus expect for stylo (glosso)

Question 12

Where is blood supply from?

Answer 12

external carotid