Youtor
Embryology of the Ear II Easy to Understand
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=ipclWM_nRn8
The development of the middle and external ear explained in less than 15 minutes. • For the embryology of the inner ear, tap here: • Embryology of the Ear I (Easy to Unde... • If you are completely new to embryology and you want to understand it quickly, this should be the first video you watch: • • Introduction to Embryology - Fertilis... • -------------------------------- • Recommended Text • -------------------------------- • Easy Embryology is a book that is dedicated to the simplification of embryology. It is available at https://drminass.com/product/easyembr.... Contact Dr. Minass for more information. • ---------------------------------------- • Interact With Dr. Minass! • ---------------------------------------- • Website - https://www.drminass.com • Email - [email protected] • Patreon - / drminass • Facebook - / m1na55 • Instagram - @m1.nass • Post - Address to: • Minass • Parcel Locker 10106 04448 • 59 Penshurst Street • Willoughby, NSW • Australia 2068 • ------------------------------------------------------------------------ • SUMMARY OF THE VIDEO FOR YOUR NOTES • ------------------------------------------------------------------------ • The middle ear • Tympanic cavity comes from the endoderm, from the first pharyngeal pouch. • The pouch expands laterally until it touches the first pharyngeal cleft • The distal part of the pouch is the tubotympanic recess, which widens becoming the primitive tympanic cavity. The proximal part remains narrow and becomes the auditory tube aka eustachian tube • The malleus and incus come from the first pharyngeal arch • The stapes comes from the second pharyngeal arch • Tensor tympani is innervated by the mandibular branch of the trigeminal nerve • Stapedius is innervated by the facial nerve • The external ear • External auditory meatus comes from the first pharyngeal cleft • The solid epithelial meatal plug will dissolve by the seventh month, otherwise the newborn will be deaf • Th tympanic membrane (eardrum) is made from three layers: ectoderm epithelium, mesoderm middle layer which is connective tissue, and endoderm which is the inner mucous membrane (epithelium). • The malleus' handle is in contact with the tympanic membrane. • The auricle develop from 6 swellings called the auricular hillocks. • Hillocks 1, 2, and 3 come from pharyngeal arch 1 • Hillocks 4, 5, and 6 come from the second arch • The hillocks will eventually grow and fuse together in a complicated process that I have simplified by just saying they all fuse together • 1 is the tragus, 2 is the helix, 3 is the cymba conca, 4 is the concha, 5 is the anti-helix, and 6 is the anti-tragus - lets keep it at that
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