Daphne Walston

Daphne Walston

Published: 26 Aug 2023

Source: Verywellhealth.com

The sacrum, often referred to as the “holy bone,” is a mysterious and fascinating part of the human anatomy. Located at the base of the spine, this triangular-shaped bone holds a great deal of significance both structurally and symbolically. It not only provides support and stability to the pelvis, but it also plays a crucial role in the intricate network of nerves and blood vessels.

In this article, we will delve into the enigmatic world of the sacrum and uncover nine intriguing facts that you may not have known. From its ancient origins to its unique characteristics, prepare to be amazed by the wonders of this often overlooked bone.

Table of Contents

The Core Structure of the Human Spine

The sacrum, also known as the sacred bone, is a triangular-shaped bone located at the base of the spine. It connects the lumbar vertebrae to the coccyx, forming the foundation of the pelvic girdle.

An Integral Support for the Body

The sacrum plays a crucial role in supporting the weight of the upper body and transferring it to the pelvis and lower limbs. It acts as a strong anchor, providing stability and balance for various activities such as standing, walking, and running.

The Fusion of Multiple Vertebrae

The sacrum is formed by the fusion of five vertebrae during early adulthood. This fusion results in a solid bone that provides strength and protection for the spinal cord, nerves, and vital organs in the pelvic region.

An Articulation Point for the Pelvis

The sacrum articulates with the ilium bones on either side, forming the sacroiliac joints. These joints allow for minimal movement, enabling the pelvis to accommodate changes during pregnancy, childbirth, and other physical activities.

A Gateway for Spinal Nerves

The sacrum contains large openings called sacral foramina, through which the spinal nerves exit the spinal cord. These nerves branch out to innervate the lower extremities, contributing to motor control and sensory perception.

A Source of Mystical Symbolism

The sacrum has held symbolic significance in various cultures throughout history. Its shape and location near the sacral chakra, associated with creativity and spirituality, have led to interpretations of the sacrum as a sacred and powerful center.

A Remnant of Our Evolutionary Past

The sacrum bears resemblance to the tails of our early ancestors. Although the human tailbone, or coccyx, has lost its original function, the sacrum remains as a vestige of our evolutionary journey.

Impacted by Trauma and Degenerative Conditions

The sacrum is vulnerable to injury and degenerative disorders, such as fractures, tumors, and sacroiliac joint dysfunction. These conditions can cause pain, limited mobility, and affect the overall functioning of the lower back and pelvis.

An Object of Scientific Study and Medical Advancements

Scientists, anatomists, and medical professionals continue to study the sacrum to deepen their understanding of its structure, function, and potential treatments for sacral-related conditions. Ongoing research contributes to advancements in orthopedics, neurology, and other related fields.


The sacrum is a fascinating and enigmatic part of the human anatomy. From its unique triangular shape to its crucial role in connecting the spine to the pelvis, the sacrum plays a vital role in our overall posture and movement. Understanding its structure and function can help us appreciate the intricate design of our bodies.

Through this article, we have explored various intriguing facts about the sacrum, such as its fusion of multiple vertebrae, its location at the base of the spine, and its significance in providing stability and support. We have also learned about the sacral canal, which houses the spinal nerves and protects them from potential damage.

Moreover, we have delved into the concept of sacralization, a condition where an extra bone fuses with the sacrum, and the implications it can have on one’s mobility and overall well-being. Additionally, we have discussed the influence of the sacrum on childbirth and its connection to the sacroiliac joint.

By gaining a deeper insight into the mysteries of the sacrum, we can develop a greater appreciation for the intricate workings of our bodies. Its significance in maintaining balance, supporting our weight, and protecting vital nerves highlights the incredible nature of human anatomy.

So, the next time you think about your spine, take a moment to marvel at the enigmatic and remarkable sacrum.


1. What is the sacrum?

The sacrum is a triangle-shaped bone located at the base of the spine. It consists of fused vertebrae and plays a crucial role in connecting the spine to the pelvis.

2. How many vertebrae make up the sacrum?

The sacrum is formed by the fusion of five vertebrae, known as S1 to S5.

3. What is sacralization?

Sacralization is a condition where an additional bone fuses with the sacrum, potentially altering its structure and affecting mobility.

4. What is the function of the sacrum?

The sacrum provides stability and support to the upper body, transfers the weight of the torso to the lower limbs, and protects the spinal nerves within the sacral canal.

5. How does the sacrum affect childbirth?

The sacrum widens during childbirth, allowing the baby’s head to pass through the birth canal. Its flexibility and shape are crucial for a successful delivery.

6. What is the sacroiliac joint?

The sacroiliac joint is the connection point between the sacrum and the ilium bones of the pelvis. It plays a role in transferring forces between the upper body and lower limbs.

7. Can sacral issues cause back pain?

Problems with the sacrum, such as sacroiliac joint dysfunction or sacralization, can contribute to lower back pain and discomfort.

8. How can I maintain a healthy sacrum?

Maintaining good posture, engaging in regular exercise to strengthen the core muscles, and practicing proper body mechanics can help support a healthy sacrum.

9. Can the sacrum be injured?

Yes, the sacrum can be injured due to trauma, such as falls or accidents. In some cases, fractures or dislocations may occur, requiring medical attention.