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ENT
Embryology and Developmental Anatomy of the Ear
Built from Haynes-Glasscock-Shambaugh Surgery of the Ear, Seventh Edition
What’s inside
9 sections · 78 slides
Overview
- Scope of temporal bone embryology
External ear
- Origin and timing of auricular development
- Adult derivatives of the six hillocks
- Six hillocks of His and the adult auricle
- Postnatal growth of the auricle
- Anomalies from failed hillock fusion
- Development of the external auditory canal
Tympanic membrane and tympanic cavity
- Trilaminar origin of the tympanic membrane
- The tympanic ring and the notch of Rivinus
- Congenital cholesteatoma and drum orientation
- The tubotympanic recess and tympanic cavity
- Mastoid pneumatisation and the neonatal mastoid tip
Ossicular chain
- Function and timing of ossicular development
- Cartilaginous precursors of the ossicles
- Stapes ring formation and the stapedial artery
- The dual-arch theory of ossicular origin
- Embryologic origin of the ossicular chain
- Arch origin of the middle ear muscles
- Otoscopic corollary of the dual-arch theory
- Congenital anomalies of the middle ear
- Spectrum of ossicular chain abnormalities
- Exploratory tympanotomy and ossiculoplasty
- Congenital stapes footplate fixation
- Imaging and surgical timing in footplate fixation
Inner ear
- Otic placode and formation of the otocyst
- Dorsal and ventral derivatives of the otocyst
- Otocyst formation and its derivatives
- Sequence of semicircular canal formation
- Elongation of the cochlear duct
- Differentiation of the organ of Corti
- Formation of the otic capsule and perilymphatic spaces
- Oval window, round window and Hyrtl's fissure
- Development of the vestibulocochlear nerve
- Membranous labyrinthine dysplasias
- Timing of combined osseous and membranous malformations
- Michel aplasia, rudimentary otocyst and common cavity
- Incomplete partition types and cochlear hypoplasia
- Semicircular canal malformations and CHARGE syndrome
Facial nerve
- Derivation and territory of the facial nerve
- Timeline of facial nerve development
- Segments of the fallopian canal
- Formation of the genua and canal ossification
- Facial nerve variants in congenital ear anomalies
- Dehiscence of the tympanic segment
Sensory nerves of the ear
- Sensory supply of the external and middle ear
- Jacobson's nerve and the tympanic plexus
- Arnold's nerve and the nervus intermedius
- Hitselberger's sign
- Auriculotemporal and great auricular nerves
Arterial supply of the ear
- Fate of the six aortic arches
- Fifth and sixth arches and the mandibular artery
- Embryologic development of the internal carotid artery
- Branches and annexation of the stapedial artery
- Adult configuration and persistent stapedial artery
- Clinical presentation of persistent stapedial artery
- Arterial supply of the adult middle ear
- Arterial supply to the middle ear
- Aberrant internal carotid artery
- Presentation and imaging of an aberrant carotid
- Aberrant carotid artery on temporal bone CT
Summary
- Key developmental landmarks
- Surgical implications of temporal bone embryology
- Conclusions
- References
- References (continued)
- References (continued)
- References (continued)
- References (continued)
- Haynes-Glasscock-Shambaugh Surgery of the Ear, Seventh Edition
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