Embryology Flashcards
1st pharyngeal arch components
skeletal: maxillary process (maxilla, zygomatic, part of temporal bone) and mandibular process
muscles: muscles of mastication, mylohyoid, anterior belly of digastric, tensor tympani and tenor palatini (all V3)
CN: V
2nd pharyngeal arch components
skeletal: styloid process of temporal bone, sylohyoid ligament, upper part of hyoid
muscles: facial expression
CN: VII
3rd pharyngeal arch components
skeletal: lower parts of hyoid
muscle: stylopharyngeus
CN: IX
4th and 6th pharyngeal arch components
skeletal: laryngeal cartilage
muscles of 4: cricothyroid (intrinsic laryngeal muscle but external laryngeal nerve - CNX) levator palatini and pharyngeal constrictors
muscles of 6: intrinsic laryngeal muscles (supplied by recurrent laryngeal nerve - branch inferior laryngeal nerve (CNX))
what does the 1st pharyngeal cleft form
external auditory meatus
what does the 1st pharyngeal pouch form
middle ear
eustachian tube
tympanic membrane
what does the 2nd pharyngeal pouch form
palatine tonsil
what does the 3rd pharyngeal pouch form
inferior parathyroid glands
thymus
which arch is your incus and malleus in
1st
which arch is your hyoid bone in
2nd and 3rd
which arch is your thyroid and cricoid cartilage in
4th
which arch is your stapes in
2nd
