Information about Pelvic Inlet
| Bone: Pelvic inlet | ||
|---|---|---|
| Diameters of superior aperture of lesser pelvis (female). | ||
| Latin | apertura pelvis superior | |
| subject #58 239 | ||
| Dorlands/Elsevier | a_51/12144724 | |
The superior aperture is somewhat heart-shaped, obtusely pointed in front, diverging on either side, and encroached upon behind by the projection forward of the promontory of the sacrum.
The edge of the inlet is known as the pelvic brim. Occasionally, the terms are used interchangeably.
Boundaries
It is formed as follows:- laterally: by the pectineal line (or iliopectineal line) and arcuate lines
- in front: by the crests of the pubes (or pubic symphysis)
- behind: by the anterior margin of the base of the sacrum (or the ala of sacrum) and sacrovertebral angle (or sacral promontory)
Diameters
It has three principal diameters: antero-posterior, transverse, and oblique.| Name | Description | Average measurement in female |
| anteroposterior or conjugate diameter | extends from the sacrovertebral angle (promontorium) to the symphysis pubis; | 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. |
External links
- SUNY Anatomy Image 9951
- SUNY Anatomy Image 9950 - transverse diameter is blue pipecleaner, anteroposterior or conjugate diameter is red pipecleaner
- Image at mun.ca
- Norman/Georgetown pelvis (medialpelvissmall, malepelvissagittalinlet&outletsml)
Bones of pelvis/pelvic cavity | |
|---|---|
| General | sacrum, coccyx, hip bone |
| Ilium | Arcuate line - Wing - gluteal lines (Posterior, Anterior, Inferior) - Fossa - Tuberosity - Crest - iliac spines (Anterior superior - Anterior inferior - Posterior superior - Posterior inferior) |
| Ischium | Body (Ischial spine, Lesser sciatic notch) - Superior ramus (Tuberosity of the ischium) - Inferior ramus |
| Pubis | Superior ramus (Pubic tubercle, Pubic crest, Obturator crest) - Inferior ramus (Pectineal line) |
| Compound | Obturator foramen - Acetabulum - Acetabular notch - Greater sciatic notch - Iliopectineal eminence - Ischiopubic ramus - Pubic arch - Lesser pelvis (Pelvic inlet, Pelvic brim, Pelvic outlet) - Greater pelvis |
Latin}}}
Official status
Official language of: Vatican City
Used for official purposes, but not spoken in everyday speech
Regulated by: Opus Fundatum Latinitas
Roman Catholic Church
Language codes
ISO 639-1: la
ISO 639-2: lat
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Official status
Official language of: Vatican City
Used for official purposes, but not spoken in everyday speech
Regulated by: Opus Fundatum Latinitas
Roman Catholic Church
Language codes
ISO 639-1: la
ISO 639-2: lat
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Elsevier, the world's largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. Based in Amsterdam, the company has substantial operations in the UK, USA and elsewhere.
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The lesser pelvis (or true pelvis) is that part of the pelvic cavity which is situated below and behind the pelvic brim.
Its bony walls are more complete than those of the greater pelvis.
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Its bony walls are more complete than those of the greater pelvis.
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pelvic brim. The "linea terminalis" consists of the pectineal line, the pubic crest and the arcuate line
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External links
- SUNY Labs 44:os-0504
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The sacrum is a large, triangular bone at the base of the spine and at the upper and back part of the pelvic cavity, where it is inserted like a wedge between the two hip bones.
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pelvic brim. The "linea terminalis" consists of the pectineal line, the pubic crest and the arcuate line
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External links
- SUNY Labs 44:os-0504
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The pecten pubis or pectineal line of the pubis is a ridge on the superior ramus of the pubic bone.
The pecten pubis forms part of the pelvic brim.
Lying across it are fibers of the pectineal ligament and the proximal origin of the pectineus muscle.
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The pecten pubis forms part of the pelvic brim.
Lying across it are fibers of the pectineal ligament and the proximal origin of the pectineus muscle.
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iliopectineal eminence (or iliopubic eminence, or iliopectineal line), which marks the point of union of the ilium and pubis.
It constitutes a lateral border of the pelvic inlet.
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It constitutes a lateral border of the pelvic inlet.
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In anatomy, an arcuate line is any structure that is curvilinear.
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- Arcuate line (anterior abdominal wall)
- Arcuate line (ilium)
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Medial to the pubic tubercle is the pubic crest, which extends from this process to the medial end of the bone.
It affords attachment to the inguinal falx, and to the Rectus abdominis and Pyramidalis.
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It affords attachment to the inguinal falx, and to the Rectus abdominis and Pyramidalis.
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The pubic symphysis is the midline cartilaginous joint uniting the superior rami of the left and right pubic bones (pubis). It is located anterior to the urinary bladder and superior to the external genitalia; for females it is above the vulva and for males it is above the penis.
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The base of the sacrum, which is broad and expanded, is directed upward and forward.
In the middle is a large oval articular surface, the upper surface of the body of the first sacral vertebra, which is connected with the under surface of the body of the last lumbar
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In the middle is a large oval articular surface, the upper surface of the body of the first sacral vertebra, which is connected with the under surface of the body of the last lumbar
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ala.
It is slightly concave from side to side, convex from before backward, and gives attachment to a few of the fibers of the Iliacus.
The posterior fourth of the ala represents the transverse process, and its anterior three-fourths the costal process of the first
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It is slightly concave from side to side, convex from before backward, and gives attachment to a few of the fibers of the Iliacus.
The posterior fourth of the ala represents the transverse process, and its anterior three-fourths the costal process of the first
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sacrovertebral angle when articulated with the last lumbar vertebra.
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See also
- Sacral promontory
- Pelvic inlet
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The Sacral promontory is the anatomical term for the superiormost portion of the sacrum. It marks part of the border of the pelvic inlet.
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See also
- Sacrovertebral angle
External links
- SUNY Labs 43:st-0408
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The pubic symphysis is the midline cartilaginous joint uniting the superior rami of the left and right pubic bones (pubis). It is located anterior to the urinary bladder and superior to the external genitalia; for females it is above the vulva and for males it is above the penis.
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The sacroiliac joint is the joint between the sacrum, at the base of the spine, and the ilium of the pelvis, which are joined by ligaments. It is a strong, weightbearing synovial joint with irregular elevations and depressions that produce interlocking of the bones.
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State University of New York, abbreviated SUNY (IPA pronunciation: ['suniː]) is a system of public institutions of higher education in New York, United States.
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State University of New York, abbreviated SUNY (IPA pronunciation: ['suniː]) is a system of public institutions of higher education in New York, United States.
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Georgetown University is a private, Jesuit, research university, located in Washington, D.C.'s Georgetown neighborhood. Father John Carroll founded the school in 1789, though its roots extend back to 1634.
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Bones are rigid organs that form part of the endoskeleton of vertebrates. They function to move, support, and protect the various organs of the body, produce red and white blood cells and store minerals.
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pelvis (pl. pelvises or pelves) is the bony structure located at the base of the spine (properly known as the caudal end). The pelvis incorporates the socket portion of the hip joint for each leg (in bipeds) or hind leg (in quadrupeds).
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The pelvic cavity is a body cavity that is bounded by the bones of the pelvis and which primarily contains reproductive organs, the urinary bladder, and the rectum.
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Borders
The boundaries are as follows:- anterior: pubic symphysis
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The sacrum is a large, triangular bone at the base of the spine and at the upper and back part of the pelvic cavity, where it is inserted like a wedge between the two hip bones.
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The coccyx (pronounced kok-siks) (Latin: os coccygis), commonly referred to as the tailbone, is the final segment of the human vertebral column, of four fused vertebrae (the coccygeal vertebrae) below the sacrum.
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The hip bone (or innominate bone) is a large, flattened, irregularly shaped bone, constricted in the center and expanded above and below. It is one of the few ball and socket synovial joints in the body.
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For other uses, see Ilion (disambiguation).
The ilium of the pelvis is divisible into two parts, the body and the ala; the separation is indicated on the internal surface by a curved line, the arcuate line, and on the external surface by the margin
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- For other arcuate lines, see arcuate line.
It runs inferior, anterior, and medial.
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The wing of ilium (or ala) is the large expanded portion which bounds the greater pelvis laterally. It presents for examination two surfaces—an external and an internal—a crest, and two borders—an anterior and a posterior.
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The posterior gluteal line (superior curved line), the shortest of the three gluteal lines, begins at the crest, about 5 cm. in front of its posterior extremity; it is at first distinctly marked, but as it passes downward to the upper part of the greater sciatic notch,
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