Wing of ilium
Name = Wing of ilium
Latin = a. ossis ilii
GraySubject = 57
GrayPage = 232
Caption = Right hip bone. External surface.
Caption2 = Right hip bone. Internal surface.
DorlandsPre = a_21
DorlandsSuf = 12118073
The wing of ilium (or ala) is the large expanded portion which bounds the
greater pelvislaterally. It presents for examination two surfaces—an external and an internal—a crest, and two borders—an anterior and a posterior.
The external surface, known as the dorsum ilii, is directed backward and lateralward behind, and downward and lateralward in front.
It is smooth, convex in front, deeply concave behind; bounded above by the crest, below by the upper border of the
acetabulum, in front and behind by the anterior and posterior borders.
The "posterior gluteal line" (superior curved line), the shortest of the three, 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, where it ends, it becomes less distinct, and is often altogether lost.
Behind this line is a narrow semilunar surface, the upper part of which is rough and gives origin to a portion of the Glutæus maximus; the lower part is smooth and has no muscular fibers attached to it.
The "anterior gluteal line" (middle curved line), the longest of the three, begins at the crest, about 4 cm. behind its anterior extremity, and, taking a curved direction downward and backward, ends at the upper part of the greater sciatic notch.
The space between the anterior and posterior gluteal lines and the crest is concave, and gives origin to the Glutæus medius.
Near the middle of this line a nutrient
foramenis often seen.
The "inferior gluteal line" (inferior curved line), the least distinct of the three, begins in front at the notch on the anterior border, and, curving backward and downward, ends near the middle of the greater sciatic notch.
The surface of bone included between the anterior and inferior gluteal lines is concave from above downward, convex from before backward, and gives origin to the Glutæus minimus.
Between the inferior gluteal line and the upper part of the acetabulum is a rough, shallow groove, from which the reflected tendon of the
Internal surface of the ala
The internal surface of the ala is bounded above by the crest, below, by the arcuate line; in front and behind, by the anterior and posterior borders.
It presents a large, smooth, concave surface, called the iliac fossa, which gives origin to the
Iliacusand is perforated at its inner part by a nutrient canal; and below this a smooth, rounded border, the arcuate line, which runs downward, forward, and medialward.
Behind the iliac fossa is a rough surface, divided into two portions, an anterior and a posterior. The anterior surface (auricular surface), so called from its resemblance in shape to the ear, is coated with cartilage in the fresh state, and articulates with a similar surface on the side of the sacrum.
The posterior portion, known as the iliac tuberosity, is elevated and rough, for the attachment of the
posterior sacroiliac ligamentsand for the origins of the Sacrospinalisand Multifidus.
Below and in front of the auricular surface is the preauricular sulcus, more commonly present and better marked in the female than in the male; to it is attached the pelvic portion of the
anterior sacroiliac ligament.
Crest of the ilium
The crest of the ilium is convex in its general outline but is sinuously curved, being concave inward in front, concave outward behind.
It is thinner at the center than at the extremities, and ends in the anterior and posterior superior iliac spines. The surface of the crest is broad, and divided into external and internal lips, and an intermediate line.
About 5 cm. behind the
anterior superior iliac spinethere is a prominent tubercle on the outer lip.
To the external lip are attached the
Tensor fasciæ latæ, Obliquus externus abdominis, and Latissimus dorsi, and along its whole length the fascia lata; to the intermediate line the Obliquus internus abdominis; to the internal lip, the fascia iliaca, the Transversus abdominis, Quadratus lumborum, Sacrospinalis, and Iliacus.
Anterior border of the ala
The anterior border of the ala is concave. It presents two projections, separated by a notch.
Of these, the uppermost, situated at the junction of the crest and anterior border, is called the
anterior superior iliac spine; its outer border gives attachment to the fascia lata, and the Tensor fasciæ latæ, its inner border, to the Iliacus; while its extremity affords attachment to the inguinal ligamentand gives origin to the Sartorius
Beneath this eminence is a notch from which the Sartorius takes origin and across which the
lateral femoral cutaneous nervepasses.
Below the notch is the
anterior inferior iliac spine, which ends in the upper lip of the acetabulum; it gives attachment to the straight tendon of the Rectus femorisand to the iliofemoral ligamentof the hip-joint.
Medial to the
anterior inferior spineis a broad, shallow groove, over which the Iliacusand Psoas majorpass.
Posterior border of the ala
The posterior border of the ala, shorter than the anterior, also presents two projections separated by a notch, the
posterior superior iliac spineand the posterior inferior iliac spine.
The former serves for the attachment of the oblique portion of the
posterior sacroiliac ligamentsand the Multifidus; the latter corresponds with the posterior extremity of the auricular surface.
Below the posterior inferior spine is a deep notch, the greater sciatic notch.
* [http://anatquest.nlm.nih.gov/VisibleHuman/ImageData/Rendered/jpg/DSR100030786.jpgphoto at nih.gov]
Wikimedia Foundation. 2010.
Look at other dictionaries:
wing of ilium — ala ossis ilii … Medical dictionary
Ilium (bone) — For other uses, see Ilion (disambiguation). For other uses, see Ilia (disambiguation). Illia redirects here. For the president of Argentina, see Arturo Umberto Illia. Not to be confused with Ileum. Bone: Ilium of pelvis … Wikipedia
wing — The anterior appendage of a bird. SYN: ala (1). angel w. a deformity in which both scapulae project conspicuously. SEE ALSO: winged scapula. ashen w. SYN: vagal (nerve) trigone. w. of central lobule [TA] the lateral winglike projection of the… … Medical dictionary
ilium — The broad, flaring portion of the hip bone, distinct at birth but later becoming fused with the ischium and pubis; it consists of a body, which joins the pubis and ischium to form the acetabulum and a broad thin portion, called the ala or … Medical dictionary
Arcuate line (ilium) — Infobox Bone Name = Arcuate line (ilium) Latin = linea arcuata ossis ilii GraySubject = 57 GrayPage = 233 Caption = Male pelvis. (Arcuate line labeled at left.) Caption2 = Right hip bone. Internal surface. (Arcuate line visible at left center.)… … Wikipedia
ala — 1. [TA] SYN: wing. 2. Pronounced, longitudinal cuticular ridges in nematodes, usually found in larval stages (Ascaris lumbricoides), although occasionally present in adult worm (Enterobius vermicularis). [L. wing] a. auris SYN: auricle (1). a.… … Medical dictionary
Кости нижней конечности — … Атлас анатомии человека
Iliac crest — Bone: Iliac crest Pelvic girdle … Wikipedia
ala ossis ilii — [TA] wing of ilium: the expanded superior portion of the ilium which forms the lateral boundary of the greater pelvis … Medical dictionary
Muscle — is the tissue of the body which primarily functions as a source of power. There are three types of muscle in the body. Muscle which is responsible for moving extremities and external areas of the body is called "skeletal muscle." Heart… … Medical dictionary