耳道

WordNet

the quantity contained in a can (同)canful
preserve in a can or tin; "tinned foods are not very tasty" (同)tin, put_up
airtight sealed metal container for food or drink or paint etc. (同)tin, tin_can
a buoy with a round bottom and conical top (同)can buoy
provide (a city) with a canal (同)canalize, canalise
long and narrow strip of water made for boats or for irrigation
(astronomy) an indistinct surface feature of Mars once thought to be a system of channels; they are now believed to be an optical illusion
a qualified accountant who inspects the accounting records and practices of a business or other organization
a student who attends a course but does not take it for credit
of or relating to the process of hearing; "auditory processing"; "an audile person" (同)audile, auditive

PrepTutorEJDIC

《能力》『…することができる』　《可能性・推量》　《平叙文で》『…であり得る』　し得る,かもしれない　《否定文で》…のはずがない,ではあり得ない　《疑問文で》いったい…だろうか　《話》《許可・軽い命令》『…してもよい』　…してあげよう;《疑問文で》…してくれませんか
『かん』(取っ手・ふた・口のついた金属・プラスチック製容器・コップなど) / 《米》(かん詰めの)『かん』,かん詰め(《英》 tin) / かん1杯(の…)《+『of』+『名』》 / …'を'かん詰めにする(また《英》『tin』) / 《米俗》…'を'くびにする
canceled / cancellation / canon / canto
『運河』 / (食道・気菅などの)導菅 / (火星の苗面に見える)運河状の地形
《まれ》聞き手,傍聴人 / 会計検査官,監査役 / 《米》(大学で単位を取らない)聴講生
耳の,聴覚の

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/10/05 19:05:42」(JST)

wiki en

The ear canal (external auditory meatus, external acoustic 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 2.5 centimetres (1 in) in length and 0.7 centimetres (0.3 in) in diameter.

Structure

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 2.5 centimetres (1 in) long and 0.7 centimetres (0.28 in) in diameter.^[2] 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.

Disorders

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
Cholesteatoma
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

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.

Additional images

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 detail.Facial nerve dissection.

References

^ 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.

External links

Veterans Health Administration web site
OSHA web site
Continuing Medical Education Ear Photographs
Otoscopy Tutorial w/ Images
Anatomy diagram: 34257.000-1 at Roche Lexicon - illustrated navigator, Elsevier

UpToDate Contents

全文を閲覧するには購読必要です。 To read the full text you will need to subscribe.

1. 耳の先天異常 congenital anomalies of the ear
2. 成人における難聴の病因 etiology of hearing loss in adults
3. 小児における聴覚障害：病因 hearing impairment in children etiology
4. 小児における赤血球産生低下による貧血 anemia in children due to decreased red blood cell production

English Journal

Computed Tomography Features of External Auditory Canal Cholesteatoma: A Pictorial Review.

Chawla A1, Ezhil Bosco JI2, Lim TC2, Shenoy JN2, Krishnan V2.
Current problems in diagnostic radiology.Curr Probl Diagn Radiol.2015 Nov-Dec;44(6):511-6. doi: 10.1067/j.cpradiol.2015.05.001. Epub 2015 May 7.
Computed tomography (CT) is widely used for evaluation of patients with otologic conditions. External auditory canal cholesteatoma (EACC), although rare, demonstrates characteristic CT appearance. Moreover, the accurate extent of involvement cannot be accurately assessed clinically. This pictorial r
PMID 26050022

A 1-year follow-up study with C-VEMPs, O-VEMPs and video head impulse testing in vestibular neuritis.

Magliulo G1, Iannella G2, Gagliardi S3, Re M4,5.
European archives of oto-rhino-laryngology : official journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery.Eur Arch Otorhinolaryngol.2015 Nov;272(11):3277-81. doi: 10.1007/s00405-014-3404-9. Epub 2014 Dec 5.
The aim of this paper was to evaluate prospectively, in a group of patients affected by VN, a diagnostic protocol employing C-VEMPs, O-VEMPs and vHIT together. The diagnosis of vestibular neurolabyrinthitis was based on the clinical history, absence of associated auditory or neurological symptoms, a
PMID 25476197

Functional results after Bonebridge implantation in adults and children with conductive and mixed hearing loss.

Rahne T1, Seiwerth I2, Götze G2, Heider C2, Radetzki F3, Herzog M2, Plontke SK2.
European archives of oto-rhino-laryngology : official journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery.Eur Arch Otorhinolaryngol.2015 Nov;272(11):3263-9. doi: 10.1007/s00405-014-3403-x. Epub 2014 Nov 26.
In patients with conductive hearing loss caused by middle ear disorders or atresia of the ear canal, a Bonebridge implantation can improve hearing by providing vibratory input to the temporal bone. The expected results are improved puretone thresholds and speech recognition. In the European Union, a
PMID 25425039

Japanese Journal

外耳道疾患の画像診断 (特集脳神経・頭頸部の診断と治療update)

臨床放射線 60(5), 641-651, 2015-05
NAID 40020483743

7.05T MRI を用いたマウス内耳の観察

Equilibrium Research 74(4), 308-312, 2015
NAID 130005101946

側頭骨線維性骨異形成症による外耳道狭窄例

耳鼻咽喉科臨床 108(9), 693-698, 2015
NAID 130005096773

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関連記事	「can」「canal」「auditory」

「can」

External acoustic meatus
	Anatomy of the human ear.
Details
Latin	meatus acusticus externus
Precursor	groove (cleft) of the first branchial arch.
Artery	anterior part: superficial temporal artery; posterior part: posterior auricular artery
Vein	superficial temporal veins, external jugular vein, pterygoid plexus
Nerve	auriculotemporal nerve, great auricular nerve, auricular branch of vagus nerve
Lymph	superficial cervical lymph nodes, deep cervical lymph nodes
Identifiers
Gray's	p.1036
Dorlands; /Elsevier	m_06/12518132
TA	A15.3.01.045
FMA	61734
	Anatomical terminology