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Skeleton Pelvis Sacrum

R Iliac Crest

The iliac crest is the area where arching bones sit on either side of your pelvis. They look somewhat like wings and extend to your hips and lower back. The iliac crest bones are attached to your oblique muscles.        Source

 

Sacrum

The sacrum is a large wedge-shaped vertebra at the inferior end of the spine. It forms the solid base of the spinal column where it intersects with the hip bones to form the pelvis. The sacrum is a very strong bone that supports the weight of the upper body as it is spread across the pelvis and into the legs.       Source

 

R Os Coxa

The hip bone (os coxa, innominate bone, pelvic bone or coxal bone). It’s a large flat bone formed by the fusion of the ilium, ischium, and pubis (in the adult), constituting the anterolateral portion of the pelvic girdle, it articulates with its fellow anteriorly at the pubic symphysis, with the sacrum posteriorly at the sacroiliac joint, and with the femur laterally at the hip joint. The two hip bones join at the pubic symphysis and together with the sacrum and coccyx (the pelvic part of the spine) comprise the skeletal component of the pelvis – the pelvic girdle which surrounds the pelvic cavity. They are connected to the sacrum, which is part of the axial skeleton, at the sacroiliac joint. Each hip bone is connected to the corresponding femur (thigh bone) (forming the primary connection between the bones of the lower limb and the axial skeleton) through the large ball and socket joint of the hip.       Source

 

R Sacroiliac Joint

This is the joint between the sacrum and the ilium bones of the pelvis, which are connected by strong ligaments. In humans, the sacrum supports the spine and is supported in turn by an ilium on each side. The joint is a strong, weight transferral synovial plane joint with irregular elevations and depressions that produce interlocking of the two bones. The human body has two sacroiliac joints, one on the left and one on the right, that often match each other but are highly variable from person to person. It transmits all the forces of the upper body to the pelvis and legs. There is not a lot of motion in the joint and it is very strong and stable.        Source

 

R Anterior Superior Iliac Spine (ASIS)

The anterior part of the ilium consists of two bony spines. Superiorly is the anterior superior iliac spine (ASIS), and inferiorly is the anterior inferior iliac spine (AIIS). The anterior superior iliac spine is a bony projection of the iliac bone and an important landmark of surface anatomy. It refers to the anterior extremity of the iliac crest of the pelvis, which provides attachment for the inguinal ligament, and the sartorius muscle. The Tensor fasciae latae muscle attaches about 5cm away at the iliac tubercle.        Source

 

R Ilium

This is the uppermost and largest part of the hip bone. The ilium is the largest of three bones that fuse together over time to comprise the outer sections of the pelvis. It is present in all human vertebrates. The ilium consists of the body and wing.         Source

 

R Anterior Inferior Iliac Spine (AIIS)

The anterior part of the ilium consists of two bony spines. Superiorly is the anterior superior iliac spine (ASIS), and inferiorly is the anterior inferior iliac spine. Its a bony eminence on the anterior border of the hip bone, or, more precisely, the wing of the ilium.        Source

 

Sacrococcygeal Joint

The sacrococcygeal joint is the joint between the sacrum and the coccyx (tailbone). is an amphiarthrodial (slightly movable) joint , formed between the oval surface at the apex of the sacrum, and the base of the coccyx. It is a slightly moveable joint which is frequently, partially or completely, obliterated in old age.       Source

 

R Pubis

This is at the front of the hip bone closest to the genitals. There is a joint between the two pubis bones called the pubic symphasis. In women, this becomes more flexible in late pregnancy to allow the baby’s head to pass through during delivery. The pubis is one of the three bones that form the bony pelvis. There is one pair of pubis bones in the most anterior, or front-most, portion of the bony pelvis. The pubis is fused in adults with the ilium and the ischium and with the other pubis at the pubic symphysis. The functions of the pubis include forming a portion of the acetabulum and hip joint and providing protection to some organs of the urinary system and the reproductive system.       Source  

 

R Ischium

This forms the lower and back part of the hip bone. Situated below the ilium and behind the pubis, it is one of these three bones whose fusion creates the hip. The superior portion of this bone forms approximately one third of the acetabulum.

 

L Iliac Crest

The iliac crest is the area where arching bones sit on either side of your pelvis. They look somewhat like wings and extend to your hips and lower back. The iliac crest bones are attached to your oblique muscles.        Source

 

L Sacroiliac Joint

This is the joint between the sacrum and the ilium bones of the pelvis, which are connected by strong ligaments. In humans, the sacrum supports the spine and is supported in turn by an ilium on each side. The joint is a strong, weight transferral synovial plane joint with irregular elevations and depressions that produce interlocking of the two bones. The human body has two sacroiliac joints, one on the left and one on the right, that often match each other but are highly variable from person to person. It transmits all the forces of the upper body to the pelvis and legs. There is not a lot of motion in the joint and it is very strong and stable.        Source

 

L Os Coxa

The hip bone (os coxa, innominate bone, pelvic bone or coxal bone). It’s a large flat bone formed by the fusion of the ilium, ischium, and pubis (in the adult), constituting the anterolateral portion of the pelvic girdle, it articulates with its fellow anteriorly at the pubic symphysis, with the sacrum posteriorly at the sacroiliac joint, and with the femur laterally at the hip joint. The two hip bones join at the pubic symphysis and together with the sacrum and coccyx (the pelvic part of the spine) comprise the skeletal component of the pelvis – the pelvic girdle which surrounds the pelvic cavity. They are connected to the sacrum, which is part of the axial skeleton, at the sacroiliac joint. Each hip bone is connected to the corresponding femur (thigh bone) (forming the primary connection between the bones of the lower limb and the axial skeleton) through the large ball and socket joint of the hip.        Source

 

L Anterior Superior Iliac Spine

The anterior superior iliac spine (abbreviated: ASIS) is a bony projection of the iliac bone and an important landmark of surface anatomy. It refers to the anterior extremity of the iliac crest of the pelvis, which provides attachment for the inguinal ligament, and the sartorius muscle. The Tensor fasciae latae muscle attaches about 5cm away at the iliac tubercle.

 

L Ilium

This is the uppermost and largest part of the hip bone. The ilium is the largest of three bones that fuse together over time to comprise the outer sections of the pelvis. It is present in all human vertebrates. The ilium consists of the body and wing.        Source

 

L Anterior Inferior Iliac Spine (AIIS)

The anterior part of the ilium consists of two bony spines. Superiorly is the anterior superior iliac spine (ASIS), and inferiorly is the anterior inferior iliac spine. Its a bony eminence on the anterior border of the hip bone, or, more precisely, the wing of the ilium.       Source

 

Coccyx

The coccyx is a triangular arrangement of bone that makes up the very bottom portion of the spine below the sacrum. It represents a vestigial tail, hence the common term tailbone. The coccyx connects with the sacrum through the sacrococcygeal joint, and there is normally limited movement between the coccyx and the sacrum. The coccyx usually moves slightly forward or backward as the pelvis, hips, and legs move. When a person sits or stands, the bones that make up the pelvis (including the coccyx) rotate outward and inward slightly to better support and balance the body. Although the tailbone is considered vestigial (or no longer necessary) in the human body, it does have some function in the pelvis. For instance, the coccyx is one part of a three-part support for a person in the seated position. The tailbone is the connecting point for many pelvic floor muscles. These muscles help support the anus and in females helps support the vagina. It assist in walking, running, and moving the legs.       Source

 

L Ischium

This forms the lower and back part of the hip bone. Situated below the ilium and behind the pubis, it is one of these three bones whose fusion creates the hip. The superior portion of this bone forms approximately one third of the acetabulum.

 

L Pubis

This is at the front of the hip bone closest to the genitals. There is a joint between the two pubis bones called the pubic symphasis. In women, this becomes more flexible in late pregnancy to allow the baby’s head to pass through during delivery. The pubis is one of the three bones that form the bony pelvis. There is one pair of pubis bones in the most anterior, or front-most, portion of the bony pelvis. The pubis is fused in adults with the ilium and the ischium and with the other pubis at the pubic symphysis. The functions of the pubis include forming a portion of the acetabulum and hip joint and providing protection to some organs of the urinary system and the reproductive system.      Source