Pharyngeal Arches Flashcards
1st pharyngeal arch neural derivatives
CNV3
1st pharyngeal arch skeletal derivatives
maxilla, zygomatic bone, meckel’s cartilage, mandible, malleus, incus, squamous portion of temporal bone
1st pharyngeal arch muscular derivatives
tensor tympani, tensor veli palatini, mylohyoid, muscles of mastication, anterior belly of digastric
2nd pharyngeal arch neural derivative
CNVII
2nd pharyngeal arch skeletal derivatives
stapes, styloid process of temporal bone, stylohyoid ligament, lesser horn of hyoid, upper part of hyoid body
2nd pharyngeal arch muscular derivatives
muscles of facial expression, posterior belly of digastric, stapedius, stylohyoid, auricular muscles
3rd pharyngeal arch neural derivative
CNIX
3rd pharyngeal arch skeletal derivatives
greater horn of hyoid, lower part of hyoid body
3rd pharyngeal arch muscular derivatives
stylopharyngeus
4th pharyngeal arch neural derivative
CNX
4th pharyngeal arch skeletal derivative
laryngeal cartilage
4th pharyngeal arch muscular derivatives
levator veli palatini, salpingopharyngeus, palatoglossus, palatopharyngeus, all pharyngeal constrictors, cricothyroid
6th pharyngeal arch neural derivative
CNX
6th pharyngeal arch skeletal derivative
laryngeal cartilages
6th pharyngeal arch muscular derivative
intrinsic muscles of the larynx
1st pharyngeal pouch
tympanic membrane, inner ear, eustachian tube
2nd pharyngeal pouch
palatine tonsil
3rd pharyngeal pouch
inferior parathyroid gland, thymus
4th pharyngeal pouch
superior parathyroid gland, thyroid gland
5 facial swellings present at week 4
frontonasal prominence, 2x maxillary prominences, 2x mandibular prominences
surrounding the primitive oral cavity
stomodeum
ectodermal thickenings on frontonasal cavity
nasal placodes
9 facial swellings present at week 5
frontonasal prominence, 2x maxillary prominences, 2x mandibular prominences, 2x medial nasal swellings, 2x lateral nasal swellings
prominences that form the upper lip
2x medial nasal prominences, 2x maxillary prominences
prominences that form the lower lip
2x mandibular prominences
prominences that form the nose
frontonasal prominence, 2x medial nasal prominence, 2x lateral nasal prominences
intermaxillary segment formed by…
fusion of 2 nasal prominences
forming intermaxillary segment is connected by…
nasal fin
nasal fin thins and opens…
nasal sac
allow nasal cavity to communicate with oral cavity behind primary palate
primitive choanae
open at junction of nasal cavity with pharynx due to formation of secondary palate
definitive choanae
