WordNet

an arm off of a larger body of water (often between rocky headlands) (同)recess
of or relating to the pelvis; "pelvic exam"; "pelvic inflammation"

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入り江 / (水などの)入り口
骨盤の

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/05/18 02:38:19」(JST)

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The pelvic inlet or superior aperture of the pelvis is a planar surface which defines the boundary between the pelvic cavity and the abdominal cavity (or, according to some authors, between two parts of the pelvic cavity, called lesser pelvis and greater pelvis).

Its position and orientation relative to the skeleton of the pelvis is anatomically defined by its edge, the pelvic brim. The pelvic brim is an approximately apple-shaped line passing through the prominence of the sacrum, the arcuate and pectineal lines, and the upper margin of the pubic symphysis.

Occasionally, the terms pelvic inlet and pelvic brim are used interchangeably.

Boundaries

The edge of the pelvic inlet (pelvic brim) is formed as follows:

	Anteriorly by the pubic crest (or pubic symphysis)
Laterally by the iliopectineal line		(same as other side)
	Posteriorly by the anterior margin of the base of the sacrum (or the ala of sacrum) and sacrovertebral angle (or sacral promontory)

Diameters

The diameters or conjugates of the pelvis are measured at the pelvic inlet and outlet and as oblique diameters.

Name	Description	Average measurement in female
Anteroposterior or conjugate diameter or conjugata vera	Extends from the sacrovertebral angle (promontorium) to the pubic symphysis;	about 110 mm.
Transverse diameter	Extends across the greatest width of the superior aperture, from the middle of the brim on one side to the same point on the opposite;	about 135 mm.
Oblique diameter	Extends from the iliopectineal eminence of one side to the sacroiliac articulation of the opposite side;	about 125 mm.
Anatomical conjugate	Extends from the pubic symphysis to the promontory;	about 120 mm.
Diagonal conjugate	Extends from inferior pubic ligament to promontory through the vagina;	about 130 mm.
Straight conjugate	Extends from the lower border of the pubic symphysis to the tip of coccyx. The coccyx can bend posteriorly and expand the diameter with 25 mm;	about 95 mm (+ 25 mm).
Median conjugate	Extends from the lower border of the pubic symphysis to the lower border of the sacrum;	about 115 mm.

Two diameters may be measured from the outside of the body using a pelvimeter

Name	Description	Average measurement in female
Interspinous distance	Extends between the anterior superior iliac spines;	about 260 mm.
Intercristal distance	Extends between the furthest later points of the two iliac crests;	about 290 mm.

Additional images

Pelvis
Conjugata vera as measured on sagittal MRI

External links

Anatomy image:9951 at the SUNY Downstate Medical Center
Anatomy image:9950 at the SUNY Downstate Medical Center - transverse diameter is blue pipecleaner, anteroposterior or conjugate diameter is red pipecleaner
Image at mun.ca
pelvis at The Anatomy Lesson by Wesley Norman (Georgetown University) (medialpelvissmall, malepelvissagittalinlet&outletsml)

UpToDate Contents

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1. 女性における骨盤臓器脱：疫学、危険因子、臨床症状、およびマネージメントの概要 pelvic organ prolapse in women an overview of the epidemiology risk factors clinical manifestations and management
2. 女性における慢性骨盤痛の原因 causes of chronic pelvic pain in women
3. 女性における慢性骨盤痛の評価 evaluation of chronic pelvic pain in women
4. 女性における慢性骨盤痛の治療 treatment of chronic pelvic pain in women
5. 女性における筋筋膜性骨盤痛症候群の治療 treatment of myofascial pelvic pain syndrome in women

English Journal

Fetal pelvic index to predict cephalopelvic disproportion - a retrospective clinical cohort study.

Korhonen U1,2, Taipale P1,3, Heinonen S1,4.
Acta obstetricia et gynecologica Scandinavica.Acta Obstet Gynecol Scand.2015 Jun;94(6):615-21. doi: 10.1111/aogs.12608. Epub 2015 Mar 7.
OBJECTIVE: To investigate the diagnostic accuracy of the fetal pelvic index to predict cephalopelvic disproportion.DESIGN: Retrospective observational cohort study.SETTING: Pregnant women who had been examined by X-ray or magnetic resonance imaging pelvimetry because of an increased risk of fetal-pe
PMID 25682690

Conventional versus virtual radiographs of the injured pelvis and acetabulum.

Bishop JA1, Rao AJ, Pouliot MA, Beaulieu C, Bellino M.
Skeletal radiology.Skeletal Radiol.2015 May 26. [Epub ahead of print]
BACKGROUND: Evaluation of the fractured pelvis or acetabulum requires both standard radiographic evaluation as well as computed tomography (CT) imaging. The standard anterior-posterior (AP), Judet, and inlet and outlet views can now be simulated using data acquired during CT, decreasing patient disc
PMID 26009268

Covariation between human pelvis shape, stature, and head size alleviates the obstetric dilemma.

Fischer B1, Mitteroecker P2.
Proceedings of the National Academy of Sciences of the United States of America.Proc Natl Acad Sci U S A.2015 May 5;112(18):5655-60. doi: 10.1073/pnas.1420325112. Epub 2015 Apr 20.
Compared with other primates, childbirth is remarkably difficult in humans because the head of a human neonate is large relative to the birth-relevant dimensions of the maternal pelvis. It seems puzzling that females have not evolved wider pelvises despite the high maternal mortality and morbidity r
PMID 25902498

Japanese Journal

骨産道形態の時代変化 : ―頭型の時代変化との関連性の検討―

高椋浩史
Anthropological Science (Japanese Series) advpub(0), 1111180002, 2011
縄文時代から現代に至る骨産道形態の時代変化を検討し，あわせて母親の産道形態が脳頭蓋形態に及ぼす影響について検討した。分析対象地域における骨産道形態の時代変化を検討した結果，縄文人集団の骨産道サイズが比較集団中で最大であった。また，骨産道入口部の形状については，弥生人集団および中世人集団では前後径が短く，横径が長かった。それ以降の近世，近現代，現代人集団の骨産道入口部は逆に前後径が長い特徴を持ってい …
NAID 130001255782

論究骨盤単純X線inlet viewの適切な撮影角度の検討

鈴木卓
整形・災害外科 50(7), 803-807, 2007-06
NAID 40015519417

Related Pictures

★リンクテーブル★

リンク元	「骨盤入口」
関連記事	「pelvic」「inlet」

「骨盤入口」

Pelvic inlet
	Diameters of superior aperture of lesser pelvis (female).
Details
Latin	apertura pelvis superior
Identifiers
Gray's	p.239
Dorlands; /Elsevier	a_51/12144724
FMA	17272
	Anatomical terms of bone