Ilium (bone)

iliumiliailliumiliaciliac bonebrevis shelfbrevis fossailiac bladeiliac bladesiliac region
The ilium (plural ilia) is the uppermost and largest part of the hip bone, and appears in most vertebrates including mammals and birds, but not bony fish.wikipedia
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Wing of ilium

wingala or wing of iliumilial wings
The ilium consists of the body and wing.
The wing of ilium (or ala) is the large expanded portion which bounds the greater pelvis laterally.

Ischium

ischiainferior ramus of the ischiumischial
Together with the ischium and pubis, to which the ilium is connected, these form the pelvic bone, with only a faint line indicating the place of union.
Situated below the ilium and behind the pubis, it is one of these three bones whose fusion creates the hip.

Acetabulum

acetabularhip socketacetabula
The ilium of the human is divisible into two parts, the body and the wing; the separation is indicated on the top surface by a curved line, the arcuate line, and on the external surface by the margin of the acetabulum.
The ilium forms the upper boundary, providing a little less than two-fifths of the structure of the acetabulum.

Hip bone

pelvic boneinnominate bonepelvic bones
The ilium (plural ilia) is the uppermost and largest part of the hip bone, and appears in most vertebrates including mammals and birds, but not bony fish.
In some vertebrates (including humans before puberty) it is composed of three parts: the ilium, ischium, and the pubis.

Pelvic cavity

lesser pelvisgreater pelvistrue pelvis
The internal surface of the body is part of the wall of the lesser pelvis and gives origin to some fibers of the obturator internus.
The lesser pelvis is bounded in front and below by the pubic symphysis and the superior rami of the pubis; above and behind, by the sacrum and coccyx; and laterally, by a broad, smooth, quadrangular area of bone, corresponding to the inner surfaces of the body and superior ramus of the ischium, and the part of the ilium below the arcuate line.

Dinosaur

dinosaursDinosaurianon-avian dinosaurs
The clade Dinosauria is divided into the Saurischia and Ornithischia based on hip structure, including importantly that of the ilium.
Some non-dinosaurian archosaurs, including rauisuchians, also had erect limbs but achieved this by a "pillar-erect" configuration of the hip joint, where instead of having a projection from the femur insert on a socket on the hip, the upper pelvic bone was rotated to form an overhanging shelf.

Pelvis

pelvicpelvic girdlehip
The clade Dinosauria is divided into the Saurischia and Ornithischia based on hip structure, including importantly that of the ilium.
Each hip bone consists of 3 sections, ilium, ischium, and pubis.

Pubis (bone)

pubispubic bonepubic
Together with the ischium and pubis, to which the ilium is connected, these form the pelvic bone, with only a faint line indicating the place of union.
The acetabulum, which can be thought of as a "hip-socket", is an opening on each side of the pelvic girdle formed where the ischium, ilium, and pubis all meet, and into which the head of the femur inserts.

Vertebrate

Vertebratavertebratesvertebral
The ilium (plural ilia) is the uppermost and largest part of the hip bone, and appears in most vertebrates including mammals and birds, but not bony fish.

Mammal

mammalsMammaliamammalian
The ilium (plural ilia) is the uppermost and largest part of the hip bone, and appears in most vertebrates including mammals and birds, but not bony fish.

Bird

birdsAvesavian
The ilium (plural ilia) is the uppermost and largest part of the hip bone, and appears in most vertebrates including mammals and birds, but not bony fish.

Osteichthyes

bony fishbony fishesbony
The ilium (plural ilia) is the uppermost and largest part of the hip bone, and appears in most vertebrates including mammals and birds, but not bony fish.

Snake

snakesserpentSerpentes
All reptiles have an ilium except snakes, although some snake species have a tiny bone which is considered to be an ilium.

Human

humanshuman beinghuman beings
The ilium of the human is divisible into two parts, the body and the wing; the separation is indicated on the top surface by a curved line, the arcuate line, and on the external surface by the margin of the acetabulum.

Latin

Latin languageLat.la
The name comes from the Latin (ile, ilis), meaning "groin" or "flank".

Ile

Ile (disambiguation)
The name comes from the Latin (ile, ilis), meaning "groin" or "flank".

Internal obturator muscle

obturator internusObturator internus muscleinternal obturator
The internal surface of the body is part of the wall of the lesser pelvis and gives origin to some fibers of the obturator internus.

Calipers

caliperdividersvernier caliper
It is best measured by anthropometric calipers (an anthropometer designed for such measurement is called a pelvimeter).

Tape measure

measuring tapeTape (surveying)tape
Attempting to measure biiliac width with a tape measure along a curved surface is inaccurate.

Obstetrics

obstetricianobstetricobstetrical
The biiliac width measure is helpful in obstetrics because a pelvis that is significantly too small or too large can have complications.

Caesarean section

cesarean sectioncaesarian sectionC-section
For example, a large baby or a small pelvis often lead to death unless a caesarean section is performed.

Anthropologist

anthropologistssocial anthropologist
It is also used by anthropologists to estimate body mass.

Clade

cladesgroupcladistic
The clade Dinosauria is divided into the Saurischia and Ornithischia based on hip structure, including importantly that of the ilium.

Saurischia

saurischianEusaurischiaeusaurischian
The clade Dinosauria is divided into the Saurischia and Ornithischia based on hip structure, including importantly that of the ilium.

Ornithischia

ornithischianpredentaryornithischians
The clade Dinosauria is divided into the Saurischia and Ornithischia based on hip structure, including importantly that of the ilium.