WordNet

something determined in relation to something that includes it; "he wanted to feel a part of something bigger than himself"; "I read a portion of the manuscript"; "the smaller component is hard to reach"; "the animal constituent of plankton" (同)portion, component part, component, constituent
something less than the whole of a human artifact; "the rear part of the house"; "glue the two parts together" (同)portion
a line of scalp that can be seen when sections of hair are combed in opposite directions; "his part was right in the middle" (同)parting
a portion of a natural object; "they analyzed the river into three parts"; "he needed a piece of granite" (同)piece
one of the portions into which something is regarded as divided and which together constitute a whole; "the written part of the exam"; "the finance section of the company"; "the BBCs engineering division" (同)section, division
the melody carried by a particular voice or instrument in polyphonic music; "he tried to sing the tenor part" (同)voice
that which concerns a person with regard to a particular role or situation; "it requires vigilance on our part"; "they resisted every effort on his part"
make a score (on a hole) equal to par
(golf) the standard number of strokes set for each hole on a golf course, or for the entire course; "a par-5 hole"; "par for this course is 72"
of or relating to or in the region of the mastoid process
process of the temporal bone behind the ear at the base of the skull (同)mastoid_process, mastoid bone, mastoidal
relating to or resembling a nipple (同)mastoidal
a thin fragment or slice (especially of wood) that has been shaved from something (同)sliver, shaving
(usually plural) a part of a fruit or vegetable that is pared or cut off; especially the skin or peel; "she could peel an apple with a single long paring"
having a margin incised almost to the base so as to create distinct divisions or lobes

PrepTutorEJDIC

〈C〉(全体を構成する)『部分』 / 〈U〉《しばしばa~》(…の)『一部』,『一部分』《+『of』+『名』》 / 〈C〉《割合》…分の1,(比率の)1 / 〈C〉(機械,器具などの)部品 / 〈C〉(仕事などの)『役目』,分担;関与 / 〈U〉(対立・契約などの)一方の側 / 〈C〉《おもに米》(頭髪の)分け目(《おもに英》parting) / 〈C〉《複数形で》地域,地方 / 〈C〉(演劇・影画・オペラなどの)『役』,役割り(role);(役の)せりふ / 〈C〉声部,音部,パート;パート譜 / (複数形で)才能,資質 / …‘を'二つに(部分に)分ける;(各部分に)‘を'分ける)《+『名』+『into』(『in』)+『名』》 / (…から)…を引き離す,分ける《+『名』+『from』+『名』》 / (二つ以上の部分に)『分かれる』 / 『別れる』 / (物を)手放す,処分する《+『with』+『名』〈物〉》 / 一部分は,部分的に,幾分
〈U〉同等,同価,同水準,同程度 / (また『par value』)〈U〉平価,額面価格 / 〈U〉(程度・質・状態・数量などの)平均,標準;(精神・健康などの)常態 / 〈C〉(ゴルフで)標準打数,パー / 《名詞の前にのみ用いて》平均の,標準の / 額面の
(ゴルフで)〈1ホールまたは1コース〉‘を'基準打数でとる,パーで上がる
乳様突起の / 〈C〉乳様突起(耳の後ろの側頭骨にある)
〈U〉(皮を)むくこと,削ること / 〈C〉《複数形で》むいた皮,削りくず

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/08/21 15:34:43」(JST)

wiki en

The mastoid part of the temporal bone is the back part of the temporal bone. Its rough surface gives attachment to various muscles and it has openings for the transmission of blood vessels. From its borders the mastoid part articulates with two other bones.

Surfaces

Its outer surface is rough, and gives attachment to the occipitalis and posterior auricular muscles. It is perforated by numerous foramina (holes); one of these, of large size, situated near the posterior border, is termed the mastoid foramen; it transmits a vein to the transverse sinus and a small branch of the occipital artery to the dura mater.

The position and size of this foramen are very variable; it is not always present; sometimes it is situated in the occipital bone, or in the suture between the temporal and the occipital.

The mastoid portion is continued below into a conical projection, the mastoid process, the size and form of which vary somewhat; it is larger in the male than in the female.

This process serves for the attachment of the sternocleidomastoid, splenius capitis (the posterior belly of the digastric muscle), and longissimus capitis.

On the medial side of the process is a deep groove, the mastoid notch (digastric fossa), for the attachment of the digastric; medial to this is a shallow furrow, the occipital groove, which lodges the occipital artery.

The inner surface of the mastoid portion presents a deep, curved groove, the sigmoid sulcus, which lodges part of the transverse sinus; in it may be seen the opening of the mastoid foramen.

The groove for the transverse sinus is separated from the innermost of the mastoid air cells by a very thin lamina of bone, and even this may be partly deficient.

Borders

The superior border of the mastoid part is broad and serrated, for articulation with the mastoid angle of the parietal.

The posterior border, also serrated, articulates with the inferior border of the occipital between the lateral angle and jugular process.

Anteriorly the mastoid portion is fused with the descending process of the squama above; below it enters into the formation of the external acoustic meatus and the tympanic cavity.

Spaces

A section of the mastoid process shows it to be hollowed out into a number of spaces, the mastoid cells, which exhibit the greatest possible variety as to their size and number. At the upper and front part of the process they are large and irregular and contain air, but toward the lower part they diminish in size, while those at the apex of the process are frequently quite small and contain marrow; occasionally they are entirely absent, and the mastoid is then solid throughout.

In addition to these a large irregular cavity is situated at the upper and front part of the bone. It is called the tympanic antrum, and must be distinguished from the mastoid cells, though it communicates with them. Like the mastoid cells it is filled with air and lined by a prolongation of the mucous membrane of the tympanic cavity, with which it communicates. The tympanic antrum is bounded above by a thin plate of bone, the tegmen tympani, which separates it from the middle fossa of the base of the skull; below by the mastoid process; laterally by the squama just below the temporal line, and medially by the lateral semicircular canal of the internal ear which projects into its cavity. It opens in front into that portion of the tympanic cavity which is known as the attic or epitympanic recess. The tympanic antrum is a cavity of some considerable size at the time of birth; the mastoid air cells may be regarded as diverticula from the antrum, and begin to appear at or before birth; by the fifth year they are well-marked, but their development is not completed until toward puberty.

Additional images

Coronal section of right temporal bone.
Left temporal bone. Inferior surface.
Base of skull. Inferior surface.
External and middle ear, opened from the front. Right side.
Dissection of the muscles of the palate from behind.
Mastoid part of the temporal bone.Base of skull.

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

External links

Anatomy photo:22:os-0403 at the SUNY Downstate Medical Center
Anatomy diagram: 34257.000-1 at Roche Lexicon - illustrated navigator, Elsevier

UpToDate Contents

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1. 成人における慢性中耳炎、真珠腫、および乳様突起炎 chronic otitis media cholesteatoma and mastoiditis in adults
2. 小児における急性乳様突起炎：臨床的特徴および診断 acute mastoiditis in children clinical features and diagnosis
3. 小児における急性乳様突起炎：治療および予防 acute mastoiditis in children treatment and prevention
4. 小児における急性中耳炎：疫学、微生物学、臨床症状、および合併症 acute otitis media in children epidemiology microbiology clinical manifestations and complications
5. 成人における急性中耳炎（化膿性および漿液性） acute otitis media in adults suppurative and serous

English Journal

Ultrasound-guided Greater Auricular Nerve Block for Emergency Department Ear Laceration and Ear Abscess Drainage.

Flores S1, Herring AA2.
The Journal of emergency medicine.J Emerg Med.2015 Nov 14. pii: S0736-4679(15)01051-3. doi: 10.1016/j.jemermed.2015.10.003. [Epub ahead of print]
BACKGROUND: Adequate emergency department (ED) anesthesia for painful ear conditions, such as ear lacerations or ear abscesses, can be challenging. Much of the sensory innervation of the ear is supplied from the anterior and posterior branches of the greater auricular nerve (GAN). The GAN is a branc
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Morphological study of the occipital belly of the occipitofrontalis muscle and its innervation.

Jeon A1, Kim SD2, Han SH3.
Surgical and radiologic anatomy : SRA.Surg Radiol Anat.2015 Nov;37(9):1087-92. doi: 10.1007/s00276-015-1458-z. Epub 2015 Mar 14.
PURPOSE: Occipital belly (OB) of occipitofrontalis muscle (epicranius) is a muscle which covers the occipital part of the skull. The posterior auricular nerve (PAN) is the first extracranial branch of the facial nerve, which supplies the OB. The PAN is one of the structures used to identify the faci
PMID 25772517

The Human Shoulder Suspension Apparatus: A Causal Explanation for Bilateral Asymmetry and a Fresh Look at the Evolution of Human Bipedality.

Osborn ML1, Homberger DG1.
Anatomical record (Hoboken, N.J. : 2007).Anat Rec (Hoboken).2015 Sep;298(9):1572-88. doi: 10.1002/ar.23178. Epub 2015 Jul 3.
The combination of large mastoid processes and clavicles is unique to humans, but the biomechanical and evolutionary significance of their special configuration is poorly understood. As part of the newly conceptualized shoulder suspension apparatus, the mastoid processes and clavicles are shaped by
PMID 26054034

Japanese Journal

<i>Homo erectus</i> calvaria from Ngawi (Java) and its evolutionary implications

Anthropological Science 123(3), 161-176, 2015
NAID 130005113888

<i>Homo erectus</i> calvaria from Ngawi (Java) and its evolutionary implications

Anthropological Science advpub(0), 2015
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外耳道後壁削除・乳突開放型鼓室形成術

Otology Japan 24(2), 145-148, 2014
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Related Pictures

Mastoid Mastoid part of temporal bone | Radiology Reference Article | Radiopaedia.org Mastoid Mastoid part of the temporal bone Wiki Mastoid process: Anatomy, function and attachments | Kenhub Squamous Portion of Temporal Bone is more thin and translucent, and forms the upper

★リンクテーブル★

リンク元	「乳突部」
関連記事	「part」「parted」「mastoid」「par」

「乳突部」

Mastoid part of the temporal bone
	Side view of head, showing surface relations of bones.
	Occipitomastoid suture. (Temporal bone is in purple, and mastoid portion is immediately to the left of the tip of the arrow.)
Details
Latin	pars mastoidea ossis temporalis
Dorlands; /Elsevier	p_07/12617196
	Anatomical terms of bone [edit on Wikidata]

　　[★]

英: mastoid part
ラ: pars mastoidea

「part」

　　[★]

n.

部分、一部、役割、パート

v.

分割する

関: cleavage、cleave、contingency、divide、division、fractionate、fractionation、mince、moiety、parcellated、parted、partial、partition、piece、portion、region、resolution、role、split

「parted」

　　[★]

adj.

分割された、深裂の

関: cleavage、cleave、contingency、divide、division、fractionate、fractionation、mince、parcellated、part、partition、resolution、split

「mastoid」

　　[★]

乳様突起

関: mastoid process、processus mastoideus

「par」

　　[★]

comb form.

→para

ex.

parenteral 腸管外の

Mastoid part of the temporal bone
Side view of head, showing surface relations of bones.
Occipitomastoid suture. (Temporal bone is in purple, and mastoid portion is immediately to the left of the tip of the arrow.)
Details
Latin	pars mastoidea ossis temporalis
Dorlands /Elsevier	p_07/12617196
*Anatomical terms of bone* [edit on Wikidata]

匿名

検索

案内

案内

mastoid part