The Ear Flashcards
What are the Divisions of the ear
External- auricle, external auditory meatus, eternal surface of tympanic membrane
Middle- internal surface of tympanic membrane, tympanic cavity, ossicles, pharyngotympanic tube
Internal- auditory apparatus, internal auditory meatus, vestibulocochlear nerve, oral windows, round windows
External ear- auricle
Helix Anti helix Antitragus Tragus Pinna Concha of auricle Elastic cartilage Muscles of facial expression Lymph to parotid and cervical lymph nodes
Arterial supply to auricle
External carotid- posterior auricle
Eternal carotid- anterior auricle
External carotid- superficial temporal
Perforating branches
Auricle innervation
Auriculotemporal nerve
Vestibulocochlear nerve
Glossopharyngeal nerve
Vagus nerve
External auditory meatus innervation
Mainly auriculotemporal and auricular branches from facial and vagus
Tympanic membrane
Lateral surface- auriculotemporal and auricular branches of vagus
Medial surface- tympanic branches of glossopharyngeal
Muscles in ear
Tensor tympani- vestibulocochlear
Stapedius- facial
Auditory tube
Connects nasopharynx with tympanic cavity
Sensory via glossopharyngeal
Middle ear arterial supply
Anterior tympanic artery from first part of maxillary artery
Contributions form ascending pharyngeal, middle menigeal, posterior auricular, artery of pterygoid canal and caroticotympanic branch of internal carotid
Cochlear
Cochlear nerve form vestibulocochlear
Semi-circular canals
Semi-circular ducts
Each duct swells at end- ampullae
Ampullae
Each ampullae houses crista ampullaris that responds to rotation of the head
Inner ear arterial supply
Main- internal auditory
Internal auditory branches to form common cochlear and vestibular arteries
Internal auditory usually a branch of anteroinferior cerebellar artery or basilar artery
