What is the upper anterior margin of the sacrum that projects forward called?

1. What is the anterior part of a vertebra?
2. What is the opening at the top of the sacral canal?
3. Is the sacrum posterior or anterior?
4. What is the function of the sacral promontory?
5. What is the sacral region?
6. What does the tubercle of a rib articulate with?
7. How does the sacral canal open to the anterior and posterior surfaces of the sacrum?
8. Where is the anterior sacral foramina?
9. What exits anterior sacral foramina?
10. What is second sacral segment?
11. Where is the sacral wing?
12. What muscles are attached to sacrum?
13. What feature articulates with the sacrum?
14. What bone is above the tailbone?
15. What is lumbar and sacral?
16. What is the tailbone called?

What is the anterior part of a vertebra?

The body is the anterior portion of each vertebra and is the part that supports the body weight. Because of this, the vertebral bodies progressively increase in size and thickness going down the vertebral column. The bodies of adjacent vertebrae are separated and strongly united by an intervertebral disc.

What is the opening at the top of the sacral canal?

Passing inferiorly through the sacrum is a bony tunnel called the sacral canal, which terminates at the sacral hiatus near the inferior tip of the sacrum. The anterior and posterior surfaces of the sacrum have a series of paired openings called sacral foramina (singular = foramen) that connect to the sacral canal.

Is the sacrum posterior or anterior?

The sacrum is a large bone located at the terminal part of the vertebral canal, where it forms the posterior aspect of the pelvis.

What is the function of the sacral promontory?

The superior aspect of the sacrum, referred to as the sacral promontory, articulates superiorly with the L5 vertebral body of the lumbar spine. This arrangement forms the lumbosacral joint, which is reinforced by iliolumbar and lumbosacral ligaments.

What is the sacral region?

The sacral region (sacrum) is at the bottom of the spine and lies between the fifth segment of the lumbar spine (L5) and the coccyx (tailbone). The sacrum is a triangular-shaped bone and consists of five segments (S1-S5) that are fused together.

What does the tubercle of a rib articulate with?

Tubercle. The tubercle, immediately after the neck, is a prominence on the external surface of the rib which contains a medial facet that articulates with the transverse process of the numerically corresponding vertebra. This area is called the articular part.

How does the sacral canal open to the anterior and posterior surfaces of the sacrum?

Each part at the sides of the foramina is traversed by four broad, shallow grooves, which lodge the anterior divisions of the sacral nerves. They are separated by prominent ridges of bone which give origin to the piriformis muscle. ... The canal lodges the sacral nerves, via the anterior and posterior sacral foramina.

Where is the anterior sacral foramina?

The anterior (or pelvic) sacral foramina are openings in the concave anterior surface of the sacrum through which the anterior divisions of the sacral nerves and the lateral sacral arteries pass.

What exits anterior sacral foramina?

At the ends of the transverse ridges are seen the anterior sacral foramina, four in number on either side, somewhat rounded in form, diminishing in size from above downward, and directed lateralward and forward; they give exit to the anterior divisions of the sacral nerves and entrance to the lateral sacral arteries.

What is second sacral segment?

The second sacral segment safe zone is approximately transversely oriented in both sacral types but is more than twice as large in dysmorphic sacra. This segment may be a primary fixation opportunity in patients with sacral dysmorphism.

Where is the sacral wing?

At the top of the sacrum there are wings from each side called the sacral ala. At the ala, the sacrum fits between the two halves of the pelvis.

What muscles are attached to sacrum?

Muscle attachments

The iliacus and coccygeus also attach to the pelvic surface superolaterally and inferolaterally respectively. The erector spinae aponeurosis and multifidus cover the dorsal surface while the gluteus maximus attaches to the lateral borders of the sacrum.

What feature articulates with the sacrum?

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

What bone is above the tailbone?

The sacrum is located in between the right and left iliac bones (hips) and forms the back of the pelvis. The sacrum, along with the coccyx and 2 sacroiliac joints make up the pelvic girdle. The top of the sacrum (S1) joins the last lumbar vertebra (L5) and together create the lumbosacral spine.

What is lumbar and sacral?

The lumbar vertebrae are the remaining vertebrae below the last thoracic bone and the top of the sacrum. The sacral vertebrae are caged within the bones of the pelvis, and the coccyx represents the terminal vertebrae or vestigial tail. These are the five vertebra of the lower back.

What is the tailbone called?

What is the tailbone/coccyx? Your coccyx is made up of three to five fused vertebrae (bones). It lies beneath the sacrum, a bone structure at the base of your spine. Several tendons, muscles and ligaments connect to it.