WordNet
- a straight line connecting the center of a circle with two points on its perimeter (or the center of a sphere with two points on its surface)
- the length of a straight line passing through the center of a circle and connecting two points on the circumference (同)diam
PrepTutorEJDIC
- 『直径』 / (レンズなどの)倍率
- 横の,横断の;(線など)交わる / (幾何で)横軸の / 横断するもの(特に道路など) / (幾何で)横軸
Wikipedia preview
出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2013/07/10 17:12:34」(JST)
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Bone: Pelvic inlet |
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Diameters of superior aperture of lesser pelvis (female). |
Latin |
apertura pelvis superior |
Gray's |
subject #58 239 |
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.
Contents
- 1 Boundaries
- 2 Diameters
- 3 Additional images
- 4 See also
- 5 External links
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Boundaries[edit]
The edge of the pelvic inlet (pelvic brim) is formed as follows:
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Anteriorly
by the pubic crest (or pubic symphysis) |
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Laterally
by the iliopectineal line |
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(same as other side) |
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Posteriorly
by the anterior margin of the base of the sacrum (or the ala of sacrum) and sacrovertebral angle (or sacral promontory) |
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Diameters[edit]
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 promotory; |
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[edit]
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Conjugata vera as measured on sagittal MRI
See also[edit]
External links[edit]
- SUNY Anatomy Image 9951
- SUNY Anatomy Image 9950 - 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)
Bones of pelvis / pelvic cavity (TA A02.5.01–03, GA 2.231–241)
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General |
sacrum · coccyx · hip bone
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Ilium |
body
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arcuate line
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wing
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gluteal lines (posterior, anterior, inferior)
iliac spines (anterior superior, anterior inferior, posterior superior, posterior inferior)
other: crest · tuberosity · tubercle · fossa
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Ischium |
body
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ischial spine · lesser sciatic notch
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superior ramus
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tuberosity of the ischium
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inferior ramus
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no substructures
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Pubis |
body
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pubic crest
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superior ramus
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pubic tubercle · obturator crest
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inferior ramus
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pectineal line
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Compound |
acetabulum (acetabular notch) · iliopubic eminence / iliopectineal line · linea terminalis · ischiopubic ramus / pubic arch
obturator foramen · greater sciatic foramen / greater sciatic notch · lesser sciatic foramen
lesser pelvis ( pelvic inlet, pelvic brim, pelvic outlet) · greater pelvis
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anat (c/f/k/f, u, t/p, l)/phys/devp/cell
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noco/cong/tumr, sysi/epon, injr
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UpToDate Contents
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Related Links
- trans·verse di·am·e·ter [TA] the transverse diameter of the pelvic inlet, measured between the terminal lines. Synonym(s): diameter transversa [TA] trans·verse di·am·e·ter (trans-vĕrs' dī-am'ĕ-tĕr) [TA] The diameter of the pelvic inlet ...
- Transverse diameter definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. Look it up now! ... transverse diameter of the shell nearly twice as great at the polar mouth as at the equator and ...
Related Pictures
★リンクテーブル★
[★]
- 英
- transverse diameter
- ラ
- diameter transversa
[★]
- 関
- cross、crossing、transect、transversal、transverse diameter、transversely