Ear canalear canal, ear canal diagram
The ear canal external acoustic meatus, external auditory meatus, EAM Latin: meatus acusticus externus, is a tube running from the outer ear to the middle ear The adult human ear canal extends from the pinna to the eardrum and is about 25 centimetres 1 in in length and 07 centimetres 03 in in diameter
- 1 Structure
- 2 Disorders
- 3 Earwax
- 4 Additional images
- 5 See also
- 6 References
- 7 External links
The human ear canal is divided into two parts The elastic cartilage part forms the outer third of the canal; its anterior and lower wall are cartilaginous, whereas its superior and back wall are fibrous The cartilage is the continuation of the cartilage framework of pinna The bony part forms the inner two thirds The bony part is much shorter in children and is only a ring annulus tympanicus in the newborn
Size and shape of the canal vary among individuals The canal is approximately 25 centimetres 1 in long and 07 centimetres 028 in in diameter2 It has a sigmoid form and runs from behind and above downward and forward On the cross-section, it is of oval shape These are important factors to consider when fitting earplugs
Due to its relative exposure to the outside world, the ear canal is susceptible to diseases and other disorders Some disorders include:
- Atresia of the ear canal
- Bone exposure, caused by the wearing away of skin in the canal
- Contact dermatitis of the ear canal
- Ear fungus
- Ear mites in animals
- Ear myiasis, an extremely rare infestation of maggots
- Foreign body in ear
- Granuloma, a scar usually caused by tympanostomy tubes
- Otitis externa swimmer's ear, bacteria-caused inflammation of the ear canal
- Stenosis, a gradual closing of the canal
EarwaxeditMain article: Earwax
Earwax, also known as cerumen, is a yellowish, waxy substance secreted in the ear canals It plays an important role in the human ear canal, assisting in cleaning and lubrication, and also provides some protection from bacteria, fungi, and insects Excess or impacted cerumen can press against the eardrum and/or occlude the external auditory canal and impair hearing, causing conductive hearing loss
Base of skull Inferior surface
Left infratemporal fossa
External and middle ear, opened from the front Right side
Horizontal section through left ear; upper half of section
Lateral head anatomy detailFacial nerve dissection
- List of specialized glands within the human integumentary system
- ^ hednk-022—Embryo Images at University of North Carolina
- ^ Faddis, B T 2008 "Structural and functional anatomy of the outer and middle ear" In W Clark & K Ohlemiller Eds, Anatomy and physiology of hearing for audiologists pp 93–108 Thomson Delmar Learning
- Veterans Health Administration web site
- OSHA web site
- Continuing Medical Education Ear Photographs
- Otoscopy Tutorial w/ Images
- "Anatomy diagram: 34257000-1" Roche Lexicon - illustrated navigator Elsevier Archived from the original on 2014-01-01
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