WordNet

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
any membranous gap between the bones of the cranium in an infant or fetus (同)fontanel, soft_spot

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乳様突起の / 〈C〉乳様突起(耳の後ろの側頭骨にある)

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2022/02/27 00:07:01」(JST)

wiki en

The asterion is a meeting point between three sutures between bones of the skull. It is an important surgical landmark.

Structure

In human anatomy, the asterion is a visible (craniometric) point on the exposed skull. It is just posterior to the ear. It is the point where three cranial sutures meet:

the lambdoid suture.^[1]
parietomastoid suture.^[1]
occipitomastoid suture.^[1]

It is also the point where three cranial bones meet:

the parietal bone.
the occipital bone.
the mastoid portion of the temporal bone.

In the adult, it lies 4 cm behind and 12 mm above the center of the entrance to the ear canal.^{[citation needed]} Its relation to other anatomical structures is fairly variable.^[2]

Clinical significance

Neurosurgeons may use the asterion to orient themselves, in order to plan safe entry into the skull for some operations, such as when using a retro-sigmoid approach.^[1]^[3]

Etymology

The asterion receives its name from the Greek ἀστέριον (astērion), meaning "star" or "starry".

The Mercedes point is an alternative term for the asterion, for its resemblance to the Mercedes-Benz logo.

References

^ ^a ^b ^c ^d Ucerler, Hulya; Govsa, Figen (2006-10-01). "Asterion as a surgical landmark for lateral cranial base approaches". Journal of Cranio-Maxillofacial Surgery. 34 (7): 415–420. doi:10.1016/j.jcms.2006.05.003. ISSN 1010-5182 – via ScienceDirect.
^ Avci, Emel; Kocaogullar, Yalcin; Fossett, Damirez; Caputy, Anthony (2003-05-01). "Lateral posterior fossa venous sinus relationships to surface landmarks". Surgical Neurology. 59 (5): 392–397. doi:10.1016/S0090-3019(03)00037-5. ISSN 0090-3019 – via ScienceDirect.
^ Babacan S, Yildiz-Yilmaz M, Kafa IM, Coşkun I (2019). "The Surface and Intracranial Location of Asterion". J Craniofac Surg. 30 (8): e753–e755. doi:10.1097/SCS.0000000000005757. PMID 31689738.

UpToDate Contents

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4. 急性運動失調を呈する小児に対するアプローチ approach to the child with acute ataxia
5. 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

English Journal

Accuracy of ultrasound in assessing cerebellar haemorrhages in very low birthweight babies.

Parodi A1, Rossi A2, Severino M2, Morana G2, Sannia A1, Calevo MG3, Malova M1, Ramenghi LA1.
Archives of disease in childhood. Fetal and neonatal edition.Arch Dis Child Fetal Neonatal Ed.2015 Jul;100(4):F289-92. doi: 10.1136/archdischild-2014-307176. Epub 2015 Jan 30.
OBJECTIVE: To assess diagnostic accuracy of cranial ultrasound (CUS) performed through the anterior fontanelle (AF) and mastoid fontanelle (MF) in detecting cerebellar haemorrhages (CBH) in very low birthweight (VLBW) infants.SETTING: Third-level neonatal intensive care unit (NICU).DESIGN: VLBW infa
PMID 25637005

Study on the influence of the fetus head molding on the biomechanical behavior of the pelvic floor muscles, during vaginal delivery.

Silva ME1, Oliveira DA1, Roza TH1, Brandão S2, Parente MP3, Mascarenhas T4, Natal Jorge RM1.
Journal of biomechanics.J Biomech.2015 Jun 25;48(9):1600-5. doi: 10.1016/j.jbiomech.2015.02.032. Epub 2015 Feb 26.
Pelvic floor injuries during vaginal delivery are considered a significant risk factor to develop pelvic floor dysfunction. The molding of the fetus head during vaginal delivery facilitates the labor progress, since it adjusts to the birth canal geometry. In this work, a finite element model was use
PMID 25757665

The Incidence and Topographic Distribution of Sutures Including Wormian Bones in Human Skulls.

Cirpan S1, Aksu F, Mas N.
The Journal of craniofacial surgery.J Craniofac Surg.2015 Jun 24. [Epub ahead of print]
OBJECTIVE: The Wormian Bones are accessory bones located within the cranial sutures and fontanelles. The present article examines the incidence of Wormian Bones and compares the number and topographic distribution between the sutures including Wormian Bones in skulls of West Anatolian Population.MET
PMID 26114515

「泉門」

Asterion
Asterion
	Side view of head, showing surface relations of bones. (Asterion visible at center right.)
Details
Part of	skull
System	skeletal
Identifiers
Latin	Asterion
TA98	A02.1.00.020
TA2	422
FMA	76625
	Anatomical terminology [edit on Wikidata]

　　[★]

英: fontanelle, fontanelles
ラ: fonticulus, fonticuli cranii
同: 頭蓋泉門
関: [[]]

泉門

「後側頭泉門」

　　[★]

英: mastoid fontanelle (N,KA), mastoid fontanel (HT)
関: 泉門

側頭骨-後頭骨間、さらに上方では後頭骨によって囲まれた泉門

「mastoid」

　　[★]

乳様突起

関: mastoid process、processus mastoideus

[:0-1] Ucerler, Hulya; Govsa, Figen (2006-10-01). "Asterion as a surgical landmark for lateral cranial base approaches". Journal of Cranio-Maxillofacial Surgery. 34 (7): 415–420. doi:10.1016/j.jcms.2006.05.003. ISSN 1010-5182 – via ScienceDirect.

[2] Avci, Emel; Kocaogullar, Yalcin; Fossett, Damirez; Caputy, Anthony (2003-05-01). "Lateral posterior fossa venous sinus relationships to surface landmarks". Surgical Neurology. 59 (5): 392–397. doi:10.1016/S0090-3019(03)00037-5. ISSN 0090-3019 – via ScienceDirect.

[pmid-3] Babacan S, Yildiz-Yilmaz M, Kafa IM, Coşkun I (2019). "The Surface and Intracranial Location of Asterion". J Craniofac Surg. 30 (8): e753–e755. doi:10.1097/SCS.0000000000005757. PMID 31689738.

v t e Compound structures of skull
Neurocranium	Calvaria Diploë Asterion Pterion Stephanion Inion Bregma Lambda Fossae anterior middle posterior cranial cavity Base of skull Fontanelle anterior posterior sphenoidal mastoid
Facial skeleton	Nasion Gonion
Both	dacryon zygomatic arch temporal fossa infratemporal fossa pterygomaxillary fissure pterygopalatine fossa

リンク元	「泉門」「後側頭泉門」
関連記事	「mastoid」

匿名

検索

案内

案内

mastoid fontanelle