The "promontory of the sacrum" is a bony protrusion at the base of the spine, essential for maintaining posture and providing support for the pelvis. The word "promontory" is pronounced [prəˈmɒntəri], while "sacrum" is pronounced [ˈseɪkrəm]. When combined, the stress falls on the first syllable of "promontory" and the second syllable of "sacrum," giving the word the following pronunciation: [prəˈmɒntəri əv ðə ˈseɪkrəm]. Getting the spelling right is crucial to communicating this anatomical term effectively.
The promontory of the sacrum refers to a distinct bony prominence located along the anterior surface of the sacrum, which is a triangular-shaped bone situated at the base of the spine. This anatomical feature can be found in the pelvic region, specifically at the superior aspect of the sacrum where it articulates with the last lumbar vertebra.
The sacrum, consisting of five fused vertebrae, is an important structure that connects the axial skeleton to the pelvic region. The promontory of the sacrum serves as a distinguishing landmark, providing an important reference point for various anatomical measurements and clinical assessments.
The prominence is characterized by a slightly curved or bulging shape, protruding forward towards the abdominal cavity. It is easily palpable when touched, especially in individuals with less body fat. Additionally, this bony landmark plays a role in determining the shape and size of the pelvic inlet, which is significant during childbirth.
Understanding the promontory of the sacrum is valuable in numerous medical disciplines, including orthopedics, obstetrics, and radiology. The bony prominence, being a notable anatomical feature, is also essential in imaging techniques like X-rays and CT scans for assessing various conditions or serving as a reference point for proper positioning during certain clinical procedures.
• Promontorium (1).
• The salient angle formed at the junction of the last lumbar vertebra with the sacrum.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.