Wing of ilium The wing (ala) of ilium is the large expanded portion of the ilium, the bone 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.
What is the right wing of the ilium?
Right hip bone. Internal surface. 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.
What is the ilium of the hip bone?
The Ilium. The ilium is the widest and largest of the three parts of the hip bone, and is located superiorly. The body of the ilium forms the superior part of the acetabulum (acetabular roof). Immediately above the acetabulum, the ilium expands to form the wing (or ala).
What is the superior part of the ilium?
The body of the ilium forms the superior part of the acetabulum (acetabular roof). Immediately above the acetabulum, the ilium expands to form the wing (or ala). The wing of the ilium has two surfaces: Inner surface – has a concave shape, which produces the iliac fossa (site of origin of the iliacus muscle).
What is the iliac crest?
The ilium bone is the largest of the three bones that compromise the pelvis. The iliac crest is the top border of the ilium and the site of attachment of important muscles which include the internal and external obliques, tensor fascia latae, and latissimus dorsi.
What bones have Ala?
The wing (ala) of ilium is the large expanded portion of the ilium, the bone which bounds the greater pelvis laterally.
Where is the ALA on the pelvic girdle?
The ilium forms the large superior part of the hip bone and has a body and an ala (wing). The superior part of the ala forms a crest (the iliac crest), which is palpable in most individuals. The pubis forms the anterior part of the pelvic girdle and has a body and superior and inferior rami.
What are the parts of ilium?
The ilium consists of a flared expanded upper part forming the iliac crests, the iliac spines, and a small inferior part forming two-fifths of the acetabulum. It has four borders - superior, anterior, posterior and medial borders; and three surfaces - gluteal, iliac fossa and sacropelvic.
Which line separated Ala and body of the ilium?
the arcuate lineThe ilium articulates with the ischium, sacrum, and pubis. The ilium is divisible into the body and the ala, or wing. The body and ala are separated by the arcuate line on the posterior surface and the margin of the acetabulum on the inferior surface.
What does sacral ala mean?
The sacral ala is defined as the bone lateral to the sacral pedicle and averages 21, 18, and 15 mm wide on the dorsal surface of S1, S2, and S3, respectively. 8. At the midpoint of the bone on the axial plane from anterior to posterior, the sacral ala measures 27 to 29 mm from medial to lateral.
Is the sacral ala part of the hip?
Components of the Sacral Region (Sacrum) These alae articulate with the blades of the pelvis (ilium). As part of the pelvic girdle, the sacrum forms the back wall of the pelvis and also forms joints at the hip bone called the sacroiliac joints.
What is the common name for ilium?
The largest and uppermost bone of the hip, the ilium, also known as the iliac bone, is an essential part of the pelvic girdle. In adults, this fan-shaped bone is fused with two other bones, the ischium and pubis, to make the hip bone (often referred to as the coxal bone).
What type of bone is the ilium?
The ilium is the largest and most superior part of the bone, the ischium is located posteroinferiorly, and the pubis or pubic bone forms the anterior portion of the hip bone....Hip bone.ComponentsIlium, ischium, pubis (united at the acetabulum)JointsSacroiliac joint, pubic symphysis, hip joint3 more rows
Is the ilium the hip bone?
The ilium (/ˈɪliəm/) (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.
Why does my ilium bone hurt?
Injury to any of the ligaments attached to the ilium, such as the sacroiliac joint ligaments or iliolumbar ligaments, can cause ilium crest pain. Pregnancy and childbirth. Pelvic girdle pain can start at any time during pregnancy, labor, or following birth.
What is difference between ileum and ilium?
The ileum, along with the duodenum and jejunum, forms the small intestine. The ilium, along with ischium and pubis, forms the pelvic girdle. Its main role is to absorb bile salts, vitamin B12 and other digestive products that were left unabsorbed by the jejunum.
What are the 3 parts of the hip bone?
The adult os coxae, or hip bone, is formed by the fusion of the ilium, the ischium, and the pubis, which occurs by the end of the teenage years.
What are the 8 landmarks of the pelvic brim?
Pelvic Landmarks1 Introduction.2 Iliac Crest.3 Greater Trochanter of the Femur.4 ASIS.5 PSIS.6 Pubic Symphysis.7 Other.8 Validity.
Which of the following are components of the pelvic girdle?
The pelvic girdle, as I said above, is made up of three fused bones: the ischium, the ilium, and the pubis. The pubis forms the anterior part of the pelvic girdle.
What does the pelvic girdle consists of?
In discussing the pelvis, a distinction can be made between the "pelvic spine" and the "pelvic girdle." The pelvic girdle, also known as the os coxae, Latin for “bone of the hip,” consists of the fused bones identified individually as the ilium, ischium, and pubis.
Where is the anterior inferior iliac spine?
hip boneThe anterior inferior iliac spine (AIIS) is a bony eminence on the anterior border of the hip bone, or, more precisely, the wing of the ilium.
What is the ilium?
The ilium makes up the upper portion of the hip bone and pelvis. Mark Gurarie is a freelance writer, editor, and adjunct lecturer of writing composition at George Washington University. Rochelle Collins, DO, is a board-certified family medicine doctor currently practicing in Bloomfield, Connecticut. The largest and uppermost bone of the hip, the ...
What is the function of the ilium?
As indicated above, the primary purpose of the ilium is to serve as part of the pelvis and assist in both supporting the upper body and facilitating locomotion and walking. A number of muscles and nerves connect to the ilium, helping determine this bone’s function. Relevant muscles here include: 3 .
Why does my ilium hurt?
The ilium can also become fractured due to falls or other trauma. Symptoms of this include sharp pain, swelling and bruising, as well as an inability to put weight on the hip. Genetic deformities can also arise in the shape of the ilium and pelvis, which can also lead to a range of problems.
Which muscle is associated with the stabilizing function of the iliac crest?
The internal and external oblique muscles of the abdominal muscles enter the iliac crest. A number of ligaments also connect to the ilium, and these are often associated with the stabilizing functions of this bone.
What is the iliac fossa?
The iliac fossa is a shallow depression on the internal surface of the upper part of the bone. The arcuate line is a ridge that forms the bottom border of the ilium, created by the change in curvature between the upper and lower portions of the bone.
What are the two parts of the Ilium?
Anatomically speaking, the ilium is broken down into two parts: the body and the wing. The body of the ilium is its more central portion, and it forms a part of the acetabulum—the socket joint where the head of the femur (upper leg bone) rests—as well as the acetabular fossa, a deeper depression just above the joint. 1 .
What is the wing of the ilium?
The wing of the ilium, as the name implies, is the larger, expanded portion of the bone. On each side, it represents the outer, side-edge of the pelvis. The iliac crest is the curved, upper margin of the ilium. The anterior superior spine is a bony projection marking the limit of the iliac crest on the front.
What is the wing of the Ilium?
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.
What is the internal surface of the ala?
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 Iliacus and is perforated at its inner part by a nutrient canal;
What is the space between the anterior and posterior gluteal lines and the crest?
The space between the anterior and posterior gluteal lines and the crest is concave, and gives origin to the Glutæus medius .
What is the surface of the iliac fossa?
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.
Where is the tubercle on the outer lip of the iliac spine?
About 5 cm behind the anterior superior iliac spine there is a prominent tubercle on the outer lip.
Which iliac spine is shorter than the anterior?
The posterior border of the ala, shorter than the anterior, also presents two projections separated by a notch, the posterior superior iliac spine and the posterior inferior iliac spine .
Where is the anterior gluteal line?
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.
What is the medial aspect of the ilium?
On the medial aspect of the ilium, posterior to the iliac fossa is the sacropelvic surface, which is composed of the iliac tuberosity, auricular and pelvic surfaces. The auricular surface is an ear-shaped surface that articulates with the sacrum to form the sacroiliac joint. The iliac tuberosity is the posterior portion of the sacropelvic surface; it is a roughened, elevated area that provides a point of attachment for ligaments of the sacroiliac joint. The narrow pelvic surface is found anteroinferior to the auricular surface and contributes to the lateral wall of the lesser pelvis.
What is the ilium of the hip?
The ilium is a blade-shaped bone and the most superior component of the hip bone. It consists of two main parts: the body and ala (wing). The body is the smaller, inferior part of the bone that contributes to the formation of the acetabulum, while the ala is the superior expanded part and presents four borders and three surfaces.
What are the three bony surfaces of the Ilium?
The borders of the ilium bound its three bony surfaces: the gluteal, sacropelvic surfaces and iliac fossa.
Which is the most prominent feature of the ischium?
On the posteroinferior aspect of the ischial ramus is the most prominent feature of the ischium, the ischial tuberosity. It supports the weight of the body in the seated position and is a place of attachment for posterior thigh muscles (semimembranosus, semitendinosus and long head of biceps femoris), adductor magnus muscle and the sacrotuberous ligament.
What are the four distinct borders of the Ilium?
The ala of the ilium has four distinctive borders: superior (iliac crest), anterior, posterior and medial.
Where is the anterior border of the ilium?
The anterior border of the ilium extends from the anterior superior iliac spine to the acetabulum. It features the anterior inferior iliac spine just superior to the acetabulum. This spine provides a point of attachment for the straight head of the rectus femoris muscle and proximal part of the iliofemoral ligament.
Which bone is the lateral aspect of the hip?
The lateral aspect of the hip bone houses the acetabulum, one of the most prominent landmarks of this bone. It bears a socket shaped articular surface that faces anteroinferiorly which articulates with the head of the femur forming the hip joint. The three components of the hip bone unit at the acetabulum, contributing to its formation.
Which surface of the ilium produces the iliac fossa?
The wing of the ilium has two surfaces: Inner surface – has a concave shape, which produces the iliac fossa (site of origin of the iliacus muscle). External surface (gluteal surface) – has a convex shape and provides attachments to the gluteal muscles.
What is the acetabulum?
Together, the ilium, pubis and ischium form a cup-shaped socket known as the acetabulum (literal meaning in Latin is ' vinegar cup '). The head of the femur articulates with the acetabulum to form the hip joint. We shall now look at the individual parts of the hip bone, and their respective bony landmarks.
Which ramus encloses part of the obturator foramen?
The inferior ischial ramus combines with the inferior pubic ramus forming the ischiopubic ramus, which encloses part of the obturator foramen. The posterorinferior aspect of the ischium forms the ischial tuberosities and when sitting, it is these tuberosities on which our body weight falls.
Which pubic ramus extends laterally from the body to form part of the acetabulum?
Superior pubic ramus – extends laterally from the body to form part of the acetabulum.
Where is the midpoint of the inguinal ligament?
Mid-point of the inguinal ligament – halfway between the ASIS and the pubic tubercle.
How many articulations are there in the hip?
The hip bones have three main articulations:
What is the name of the bone that attaches the axial skeleton to the lower limbs?
The Hip Bone. The left and right hip bones (innominate bones, pelvic bones) are two irregularly shaped bones that form part of the pelvic girdle – the bony structure that attaches the axial skeleton to the lower limbs.
What is the Ilium Bone?
The ilium is the largest of the three bones that compromise the pelvis. There is a right and left ilium bone that meets with sacrum to form the right and the left sacroiliac joint. This is illustrated in the image to the right. The ilium bone has two parts: the body and the wing.
What is the Iliac Crest? And What is Iliac Crest Pain?
The iliac crest is the top border of the ilium. This is outlined in red in the diagram below. If you put your hand on your waist and press firmly you will feel a boney surface. This is your iliac crest. If you wear a tight belt, it may synch up onto or near your iliac crest.
Are there Ligaments that Attach to the Ilium bone?
There are several ligaments that attach to the ilium bone. These include the dorsal sacroiliac ligament, long posterior sacroiliac ligament, and iliolumbar ligament. The iliolumbar ligament connects the tip of the L5 transverse process to the inner lip of the iliac crest and is critical in the stability of the sacroiliac joint (3).
Overview
Internal surface of the ala
External surface
Crest of the ilium
Anterior border of the ala
Posterior border 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 Iliacus and 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.
External links
The external surface, known as the dorsum ossis ilium, 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.
This surface is crossed in an arched direction by three lines—the posterior, anterior, and inferior gl…