Knowledge Base
Workings of otoscope
- Use largest speculum
- External auditory canal is very sensitive. Nerve endings are one cell thick.
- Air inflation otoscopy
Principle behind air insufflation otoscopy (Pneumo-otoscope)
Anatomy of external auditory canal and ear drum
- Age and direction of canal. External ear canal is crooked. To straighten
- In Adults: Pull External ear upward and backward
- In Children: Downward and backward
- External auditory canal is very sensitive. Nerve endings are one cell thick.
- Ear drum
- Blood supply :Radial
- Ossicles
- Malleus, Chorda tympani, Stapes
- Diseases affecting external auditory canal
- External Ottitis
- Wax
- Foreign body
- Diseases affecting ear drum
- Perforation
- Ottitis media
- Red tympanic membrane
- Bulging
- Dull or absent light reflex
- Diminished movement
- Purulent material (air fluid level)
- Pathology of lesions affecting ear drum and external auditory canal
Ref:
- Bates, A Guide to Physical Exam...