Pharyngeal Arches Flashcards
From which arches do the tongue develop ?
From all the arches except 2nd arch (1st,3rd,4th,)
1st arch develops into what ?
2 lingual swellings +Tuberculum impar
3rd arch develops into what?
Cranial part of hypobrachial eminence
4th arch develops into what ?
Caudal part of hypobrachial eminence
What divides the tongue into anterior - 2/3 and posterior - 1/3 ?
Sulcus terminalis
What forms the anterior 2/3 of the tongue ?
2 lingual swellings and tuberculum impar
What forms the anterior most part of the posterior 1/3 of the tongue ?
Cranial part of hypobrachial eminence
What forms the posterior part of posterior 1/3 of tongue?
Caudal part of hypobrachial eminence
Nerve supply of anterior - 2/3 of tongue ?
Sensory supply - lingual branch of mandibular nerve
Taste supply - chorda tympani nerve
Nerve supply of posterior - 1/3 of tongue
Anterior part - glossopharyngeal (both sensory and taste supply)
Posterior part - Vagus nerve (both sensory and taste supply)
All the muscles of tongue are supplied by
Hypoglossal nerve except for palatoglossus ( supplied by pharyngeal plexus)
Muscles of tongue are derived from
Occipital myotomes/somites
Circumvallate papillae is supplied by
Glossopharyngeal nerve
Even though it’s an anterior part it is supplied by glossopharyngeal nerve
Nerve of respective arches
1st arch - mandibular nerve
2nd arch - facial nerve
3rd arch - glossopharyngeal nerve
4th Arch - vagus nerve
Why chorda tympani supplies anterior 2/3 rd of tongue even though it’s nerve of second arch ?
It is considered to be a pretrimatic nerve of 1 st arch arising from 2nd arch
