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The adult ear canal: : Rises upward and forward then descends to the drum The isthmus is: : Where the canal narrows to enter the temporal bone The pinna and the external canal together: : -Gather and reinforce accoustical signals -With the irregular shape of the auricle, cause increases and decreases at different frequencies as the sound arrives at the ear. -Forms a resonating tube. The average resonant frequency of the ear canal plus concha is: : 2700 Hz. The dividing line between the external ear and the middle ear is the: : Tympanic membrane. 2 | P a g e The ear canal contains: : Cilia, ceruminous glands. sebaceous glands. The vagus nerve (Xth cranial) is found: : Along the bottom of the ear canal. These are parts of the tympanic membrane: : Pars tensa, Pars flaccida, Umbo. An otoscopic inspection should reveal: : A clear view of the white tympanic membrane. These are parts of the pinna: : Tragus, intertragal notch, triangular fossa. Atresia refers to: : A closure of the external auditory canal. Perforation of the eardrum can be caused by: : -An infection -A fracture of the temporal bone -A nearby explosion. 3 | P a g e These are types of hearing loss: : -Conductive -Central -Sensorineural Conductive losses may be caused by: : A prolapsed canal Impacted cerumen Which surgical technique repairs the tympanic membrane? : Myringoplasty A cholesteatoma can be described as: : A pouch of skin filled with epithelial debris. When an excess of cerumen or a blockage of cerumen is detected, the hearing aid specialist should: : Refer the patient to a physician. A swollen ear may be caused b