What does the sacrum articulate with?

It articulates with the fifth lumbar vertebra, the os coxae, and the coccyx.

What is the lunate surface of acetabulum?

The lunate surface is the horseshoe-shaped articular superior surface of the acetabulum. Heavily lined with articular cartilage, it is the only part of the acetabulum that normally contacts the femoral head.

What is the articular surface of the ilium?

The sacroiliac joint is a synovial joint formed between the ilium and the sacrum….Sacroiliac joint.

Type	Synovial plane joint; nonaxial
Articular surfaces	Auricular surface of ilium, auricular surface of sacrum

How is articular surface on the lateral part of the sacrum?

The two projections at the sides of the sacrum are called the alae (wings), and articulate with the ilium at the L-shaped sacroiliac joints.

What part of the sacrum articulates with the coccyx?

Apex (apex ossis sacri) is the narrow, inferior end of the sacrum, which articulates with the first bone of the coccyx.

Where is the lunate?

The lunate is a crescent-shaped carpal bone found within the hand. The lunate is found within the proximal row of carpal bones. Proximally, it abuts the radius. Laterally, it articulates with the scaphoid bone, medially with the triquetral bone, and distally with the capitate bone.

What articulates with the acetabulum?

The acetabulum is the cup-shaped socket on the lateral aspect of the pelvis, which articulates with the head of the femur to form the hip joint.

Why is there holes in the sacrum?

Overview. A sacral dimple is an indentation, present at birth, in the skin on the lower back. It’s usually located just above the crease between the buttocks. Most sacral dimples are harmless and don’t require any treatment.

What is the purpose of the 8 holes in the sacrum?

Answer and Explanation: The eight holes in the sacrum are called the sacral foramina. Individual, a hole is called a sacral foramen. They provide an opening for the sacral…

Which part of the sacrum articulates with the ilium?

alae
The two projections at the sides of the sacrum are called the alae (wings), and articulate with the ilium at the L-shaped sacroiliac joints.

Which bones articulate at the sacroiliac joint?

The articulation between the outer side of the spine’s sacrum and the inner side of the butterfly-shaped hip bone (ilium) forms the sacroiliac joint.

On which part of the sacrum the auricular surface can be found?

The upper half of the sacrum presents in front an ear-shaped surface, the auricular surface, covered with cartilage in the fresh state, for articulation with the ilium.

What is another name for the lunate?

The lunate bone (semilunar bone) is a carpal bone in the human hand.

What attaches lunate?

Ligament Attachments The lunate is connected with the bones around it by the scapholunate, lunotriquetral, radiolunotriquetral, and ulnolunate ligaments. However, this bone has no muscular attachments.

Which region of the hip bone articulates with the sacrum?

Sacrum. The sacrum articulates with the hip bones on the auricular surface of the ilium forming the sacroiliac joint.

Which part of acetabulum is not covered with articular cartilage?

The deeper part of the acetabulum is non-articular and is occupied by the Haversian pad of fat. The head of the femur is mostly covered by articular cartilage (hyaline).

What does a sacral dimple indicate?

In most cases, sacral dimples are simply signs of minor abnormalities as the baby grows inside the womb. In rare cases, they can indicate a deeper spinal abnormality. They can also be present in later life and not cause problems.

Why is sacrum called sacred bone?

The os sacrum was so named by the Romans as a direct translation from the older Greek hieron osteon, which translates to “sacred” or “holy.” It was used in sacrificial rites and in protecting the genitalia (which in ancient times were considered sacred).

What is the lateral surface of the sacrum?

The lateral surface of the sacrum is broad above, but narrows into a thin edge below. The upper half presents in front an ear-shaped surface, the auricular surface, covered with cartilage in the immature state, for articulation with the ilium.

What bone does the sacrum articulate with?

It articulates superiorly (above) with the fifth lumbar vertebra, laterally (at the sides) with the bones of the hip (os coxae), and inferiorly (below) with the coccyx bone. The sacrum bone begins as five separate vertebrae, which anatomists label as S1-S5, but they later fuse into one sacrum bone during early adulthood.

What does the sacral promontory articulate with?

The sacral promontory articulates with the last lumbar vertebra to form the sacrovertebral angle, an angle of 30 degrees from the horizontal plane that provides a useful marker for a sling implant procedure. The pelvic surface of the sacrum is concave from the top, and curved slightly from side to side.

What is the shape of the lunate in osteology?

Osteology. The lunate is crescent-shaped with a proximal convex articular facet and a distal concave articular facet. On the medial surface is a square-shaped facet and on the lateral surface is a semilunar facet. It is broader anteriorly than it is posteriorly.