Osteomalacic pelvis | Article about osteomalacic pelvis by The Free Dictionary
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pelvis

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pelvis,

bony, basin-shaped structure that supports the organs of the lower abdomen. It receives the weight of the upper body and distributes it to the legs; it also forms the base for numerous muscle attachments. In the human pelvis there are two large hiphip,
in human anatomy, the joint separating the thigh bone from the pelvis, and the surrounding flesh. The adult hipbone consolidates three bones separate in youth: the ilium, ischium, and pubis. The two prominences commonly called the hipbones are the crests of the ilia.
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 bones, each consisting of three fused bones, the illium, ischium, and pubis. The hip bones form a ring around a central cavity. The fused terminal segments of the spine, known as the sacrum and coccyx, connect the hip bones at the back of the central cavity; a fibrous band connects them at the front. In women the pelvis is wider and has a larger capacity than in men, a condition that reflects the child-bearing function in women. See skeletonskeleton,
in anatomy, the stiff supportive framework of the body. The two basic types of skeleton found among animals are the exoskeleton and the endoskeleton. The shell of the clam is an exoskeleton composed primarily of calcium carbonate.
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.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Pelvis

 

the part of the skeleton that in mammals joins the posterior extremities and in man joins the lower extremities. The pelvis supports the spinal column and the entire upper part of the human body. It articulates with the femoral bones and hip joints. The pelvis consists of unpaired bones—the sacrum and coccyx—and of two paired pelvic (innominate) bones. The pubic bones are joined in front by the symphysis pubica and are joined in back with the sacrum by paired sacroiliac joints reinforced by strong ligaments. Each innominate bone consists of an iliac, ischial, and pubic bone that fuse together toward the end of the growth period; the site of fusion is covered by the cotyloid cavity. The female pelvis is wider and shallower than the male pelvis.

The pelvis is divided into the false and true pelvis. The false pelvis is bounded in front by the soft tissues of the anterior abdominal wall, in back by the spinal column, and on the sides by the ossa ilii. The true pelvis is bounded in front by the pubic bones, in back by the sacrum and coccyx, and on the sides by the ischial bones and soft tissues. The false pelvis contains the organs of the lower part of the abdominal cavity, and the true pelvis contains the rectum and bladder. In males, the true pelvis contains the prostate gland and seminal vesicles, and in females, the uterus with its appendages, and the vagina.

The size of the pelvis is determined by specialized instruments; in women, vaginal examination is an additional means of measurement. The muscles of the back and of the spinal column are attached to the pelvic bones in the back, and the abdominal muscles, in front; the muscles of the lower extremities also extend from the pelvis. The paired gluteus maximus is the largest muscle in the pelvic region. Blood is supplied to the pelvic walls and the organs within the pelvis by branches of the paired internal iliac artery. The pelvis is innervated by branches of the sacral plexus.

The most dangerous injuries to the pelvis are fractures caused by a great traumatic force, with or without a break in the continuity of the pelvic circumference. Dislocations are uncommon, but children with pelvic injuries often suffer ruptures of the ligaments as well as dislocations, such as those of the hip joint, rather than fractures. When the bones in the sacroiliac articulation and symphysis pubica are simultaneously displaced, half the pelvis is dislocated. During childbirth, a break in the symphysis pubica may take place. Fractures in the region of the cotyloid cavity may be associated with dislocation of the femur. Fractures of pelvic bones may accompany injuries to the organs within the pelvis, particularly ruptures of the bladder and urethra.

Diseases of the pelvis include hematogenous osteomyelitis, in which the ossa ilii and sacrum are usually affected, impairment of the sacroiliac articulation in brucellosis, and rheumatoid arthritis.

REFERENCES

Frauchi, V. Kh. Topograficheskaia anatomiia i operativnaia khirurgiia zhivota i taza. [Kazan] 1966.
Anatomiia cheloveka. Edited by S. S. Mikhailov. Moscow, 1973.

V. F. POZHARISKII

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

pelvis

[′pel·vəs]
(anatomy)
The main, basin-shaped cavity of the kidney into which urine is discharged by nephrons.
The basin-shaped structure formed by the hipbones together with the sacrum and coccyx, or caudal vertebrae.
The cavity of the bony pelvis. Also known as pelvic cavity.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

pelvis

1. the large funnel-shaped structure at the lower end of the trunk of most vertebrates: in man it is formed by the hipbones and sacrum
2. the bones that form this structure
3. any anatomical cavity or structure shaped like a funnel or cup
4. short for renal pelvis
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005


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