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Difference Between Male and Female Sacrum

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An Introduction to Male and Female Sacrum

IVSAT 2024

Anatomically speaking, vertebrates have a sacrum. It is a vertebra in the human spine that is situated above the coccyx and just above the lumbar vertebrae. It aids in the creation of the pelvis and articulates with the hip bone’s ilium on each side. Three distinct surfaces on the sacrum aid in accommodating the pelvic bones and increase the size of the pelvic cavity. An essential structure is a sacrum. It gives space for the fetus to manoeuvre during birthing, stabilises the spinal column, and secures the hip bones together. However, males and females have a different structures of sacrum.

Structure of Sacrum

The sacrum has a base, an apex and three surfaces, namely, a pelvic, dorsal and a lateral surface, and is made up of the fusion of five sacral vertebrae. The first segment’s body is big and resembles the lumbar vertebra. However, the bodies of the following bones are smaller, flattened from the rear, and bent to shape. The sacrum articulates with the iliac bones on either side, the L5 above, and the coccyx below. It has a forward tilt and is curved with an anterior concavity and a posterior convexity, creating more space for the pelvic cavity. Individuals have different variations in the sacrum’s curve.

Human sacrums are strong bones that can withstand a lot of stress and motion. The pelvis and spinal column are held together by it as an anchor point. Humans can sit up straight thanks to the sturdy platform provided by the sacrum and coccyx.

Male Sacrum

Male sacrums are higher and narrower. It impacts how the pelvis’ inlet and outflow are shaped because it is a component of the pelvis. Therefore, the male pelvic inlet is heart-shaped, while the female pelvic outflow is smaller because of the shape and curvature of the sacrum.

Female Sacrum

The sacrum is shorter and broader in females. Additionally, the female sacrum has relatively little curvature. The female pelvic inlet and outflow are shaped differently from those of the male due to the structural characteristics of the female sacrum and its role in the creation of the pelvis. As a result, the female pelvic outlet is wider than the male exit, and the female pelvic inlet is oval in shape.


The upper portion of the sacrum is also almost straight. Compared to male pelvises, female pelvises generally have a less curved sacrum. Additionally, the sacrum is positioned more obliquely backward in females in order to enlarge the pelvic cavity.

Male vs Female Sacrum

The male sacrum is longer than the female sacrum. The female sacrum is wider in comparison to the male sacrum. The pelvic inlet is heart-shaped in males, whereas it is Oval shaped in females. Male iliac crests are higher, giving the structure a longer, narrower appearance, whereas females have lower iliac crests, which give the structure a shorter, wider appearance.

Males have a more prominent promontory of sacrum , while in females, the sacral promontory is not clearly defined. In contrast to the female coccyx, the male coccyx bone curls further toward the front of the body. While the sacrum’s curvature is uneven and progressive from above downward in males, it abruptly curves forward at the lowest section of the sacrum in females.

Male vs Female Pelvis

Compared to the male pelvis, the female pelvis is shorter and wider. In contrast to the male pelvis, the female pelvis has a wider gap between the anterior superior iliac spines and an iliac crest that rises higher than the male pelvis’ iliac crest. Women typically look curvier around the hips than the average man does as a result. Additionally, compared to the male pelvic cavity, the female pelvic cavity will be smaller and shallower. The female pelvic brim is often larger than the male’s inlet, which makes birth easier. The bones of the female pelvis are lighter and thinner than the dense, rougher bones of the male pelvis, despite being wider than the typical male pelvis. Typically, male pelvic bones are smaller and narrower than those of females.

Interesting Facts

  • Contrary to other bones in your vertebral spinal column, the sacrum and coccyx may be contributing factors to your lower back pain.

  • The sacrum, which is regarded as the foundation of the human body, is significant because it connects the spine to the iliac bones and is crucial for hip stability.

  • Romans gave the os sacrum its name as a straight translation of the earlier Greek word hieron osteon, which means “sacred” or “holy.” It was utilised for genitalia protection and sacrificial rituals (which in ancient times were considered sacred.

Important Questions

1. How strong is the sacrum?

Ans: The weight of the upper body, which is distributed across the pelvis and into the legs, is supported by the sacrum, a bone that is incredibly strong.

2. How many bones are there in the sacrum?

Ans: Five united vertebrae form the sacrum, which is shaped like an inverted triangle with a concave anterior surface and a convex posterior surface.

3. The sacrum fuses at what age?

Ans: At around the age of 18, the two caudal bodies fuse, and the process of fusion continues rostrally until the S1-2 interspace eventually fuses at about the age of thirty.

Key Features

  • The concave sphenoid bone, known as the sacrum, is located near the base of the spinal column. It resembles an upside-down triangle.

  • Males have a higher sacral curvature than females do. As a result, there is a big disparity in the sacrums of men and women. Additionally, the female pelvic inlet is oval in shape, whereas the male pelvic inlet is heart-shaped.

  • The best sex-related skeletal indicator is the pelvis, which has unique characteristics that were developed for childbearing.

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FAQs on Difference Between Male and Female Sacrum

1. How do the coccyx's of men and women differ?

The female coccyx is straighter and more flexible, whereas the male coccyx projects inward.

2. What connects the sacrum with the ilium?

The sacroiliac joints, which are situated in the pelvis, link the ilium to the sacrum at the base of the spine (hip bone).

3. What organs does the sacrum protect?

The lower back nerves are enclosed by the sacrum, which also serves as a barrier of defence. The pelvis, which encloses the bladder, colon, reproductive organs, and rectum, is made up of the hip bones, the coccyx, and the sacrum.


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