ear canal

外耳道

関

external acoustic meatus、external auditory canal、external canal

WordNet

1. the quantity contained in a can (同)canful
2. preserve in a can or tin; "tinned foods are not very tasty" (同)tin, put_up
3. airtight sealed metal container for food or drink or paint etc. (同)tin, tin_can
4. a buoy with a round bottom and conical top (同)can buoy
5. fruiting spike of a cereal plant especially corn (同)spike, capitulum
6. attention to what is said; "he tried to get her ear"
7. good hearing; "he had a keen ear"; "a good ear for pitch"
8. the sense organ for hearing and equilibrium
9. provide (a city) with a canal (同)canalize, canalise
10. long and narrow strip of water made for boats or for irrigation
11. (astronomy) an indistinct surface feature of Mars once thought to be a system of channels; they are now believed to be an optical illusion
12. having ears (or appendages resembling ears) or having ears of a specified kind; often used in combination
13. the base of the natural system of logarithms; approximately equal to 2.718282...

PrepTutorEJDIC

1. 《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
2. 『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
3. canceled / cancellation / canon / canto
4. 〈C〉『耳』 / 《単数形で》『聴覚』,聴力,音感 / 《単数形で》じっと聞くこと,傾聴 / 〈C〉耳の形をした物
5. (麦・とうもろこしなどの)穂
6. 『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
7. (水さしなど)取っ手のある;(毛皮など)耳のついた

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2012/09/07 22:33:14」(JST)

wiki en

[Wiki en表示]

External acoustic meatus
Anatomy of the human ear.
Latin	meatus acusticus externus
Gray's	subject #229 1036
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
Precursor	groove (cleft) of the first branchial arch.

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 35 mm in length and 5 to 10 mm in diameter.

Structure

The human ear canal is divided into two parts. The fibrocartilaginous 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 35 mm long and 5 to 10 mm in diameter. 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

The ear canal, because of its relative exposure to the outside world, is a common victim of diseases and other disorders. Some disorders include:

• Atresia of the ear canal
• Otitis externa (swimmer's ear), bacteria-caused inflammation of the ear canal
• Contact dermatitis of the ear canal
• Ear fungus
• Ear myiasis, an extremely rare infestation of maggots
• Bone exposure, caused by the wearing away of skin in the canal
• Granuloma, a scar usually caused by tympanostomy tubes
• Stenosis, a gradual closing of the canal
• Foreign body in ear
• Cholesteatoma
• Ear mites in animals.

Earwax

Main 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.

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.

See also

• List of specialized glands within the human integumentary system

References

External links

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

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. 外耳炎：病因、臨床的特徴、および診断 external otitis pathogenesis clinical features and diagnosis
• 2. 外耳炎：治療 external otitis treatment
• 3. 悪性（壊死）外耳炎 malignant necrotizing external otitis
• 4. 小児における耳漏（耳だれ）の評価 evaluation of otorrhea ear discharge in children

English Journal

• Incomplete and delayed Sox2 deletion defines residual ear neurosensory development and maintenance.

• Dvorakova M1,2, Jahan I3, Macova I1,2, Chumak T4, Bohuslavova R1, Syka J4, Fritzsch B3, Pavlinkova G1.
• Scientific reports.Sci Rep.2016 Dec 5;6:38253. doi: 10.1038/srep38253.
• The role of Sox2 in neurosensory development is not yet fully understood. Using mice with conditional Islet1-cre mediated deletion of Sox2, we explored the function of Sox2 in neurosensory development in a model with limited cell type diversification, the inner ear. In Sox2 conditional mutants, neur
• PMID 27917898

• Triple semicircular canal plugging: a novel modality for the treatment of intractable Meniere's disease.

• Zhang D1, Fan Z1, Han Y1, Lv Y1, Li Y1, Wang H1,2.
• Acta oto-laryngologica.Acta Otolaryngol.2016 Dec;136(12):1230-1235. Epub 2016 Jul 19.
• CONCLUSIONS: TSCP, which can reduce vertiginous symptoms in patients with intractable MD, represents an effective therapy for this disorder.OBJECTIVE: To explore the long-term efficacy of triple semicircular canal plugging (TSCP) in the treatment of intractable Meniere's disease (MD).METHODS: Sevent
• PMID 27434132

• A case of patulous Eustachian tube associated with dizziness induced by nasal respiration.

• Kitajima N1, Sugita-Kitajima A2, Kitajima S3.
• Auris, nasus, larynx.Auris Nasus Larynx.2016 Dec;43(6):702-5. doi: 10.1016/j.anl.2016.03.008. Epub 2016 Apr 16.
• OBJECTIVE: To determine the relationship between Eustachian tube function and inner ear function in patulous Eustachian tube (pET).METHODS: We encountered a patient with pET accompanied by dizziness that was induced by nasal respiration. Eye movements were recorded using video-oculography, and Eusta
• PMID 27089972

Japanese Journal

• 手術により制御できた若年者の側頭骨骨髄炎例

• 耳鼻咽喉科臨床 109(2), 83-88, 2016
• NAID 130005121759

• 外耳道癌術後感染に対して有茎側頭筋弁が有用であった一例

• 耳鼻咽喉科臨床 109(2), 89-94, 2016
• NAID 130005121758

• Self-demodulation of amplitude-modulated signal components in amplitude-modulated bone-conducted ultrasonic hearing

• Jpn. J. Appl. Phys. 54(7S1), 07HF07, 2015-06-16
• NAID 150000110955

Related Pictures

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★リンクテーブル★

リンク元	「external canal」
関連記事	「can」「canal」「EAR」「ear」

「external canal」

　　[★]

外耳道

関

ear canal、external acoustic meatus、external auditory canal

「can」

　　[★]

• aux.

• (過去could)
• (可能)～できる、～しようと思えばできる、～する能力がある。
• (推量)～する可能性がある、～することがあり得る、～する/になることがある、～しない/にならないとも限らない。
• (許可)～してもよい、～しても差し支えない。

関

able、feasible、possible

　 　 　 　 　 　 　

「canal」

　　[★]

• n.

• 水路、管、導管

関

conduit、duct、ductal、ductus、meatus、pipe、tubal、tube、vas、vessel

　 　 　 　

「EAR」

　　[★]

• estimated average requirement
• 過剰絶対リスク excess absolute risk

「ear」

　　[★]

• n.

• 耳