sacrum

/'seikrəm/

Thân thiện

The sacrum is clearly labeled in this anatomical diagram of the human skeletal system.

Definition

1. Noun:
   • A triangular bone in the lower back: The sacrum is a large, wedge-shaped bone located at the base of the spine, forming the posterior (back) wall of the pelvic cavity. It is composed of five vertebrae that are fused together in adulthood.

Usage

• The sacrum is a crucial structural component connecting the spine to the hip bones (ilium).
• It articulates (connects) with the last lumbar vertebra above and the coccyx (tailbone) below.
• It transmits the weight of the upper body to the pelvic girdle and legs.

Examples

• Noun:
  • A fracture of the sacrum can cause significant lower back pain.
  • The sacrum, along with the two hip bones, forms the pelvis.
  • The nerves that exit through the openings in the sacrum serve the pelvic organs and legs.

Advanced Usage

• "Sacral" (adjective): Pertaining to the sacrum.
  • The patient experienced pain in the sacral region.
• "Sacralization": An anatomical condition where the fifth lumbar vertebra is partially or completely fused with the sacrum.
• "Sacrum" in anatomical context: Often discussed in relation to the sacroiliac joints, which connect the sacrum to the ilium of the pelvis.

Variants and Related Words

• Sacral (adj): Of or relating to the sacrum.
• Sacroiliac (adj): Pertaining to the joint between the sacrum and the ilium.
  • Sacroiliac joint dysfunction is a common cause of low back pain.

Synonyms

• Pelvic bone (posterior part): (This is a descriptive synonym, as the sacrum is the specific bone forming the posterior part of the pelvic ring.)
• Os sacrum: (The formal Latin term.)

Related Phrases / Terms

• Sacroiliac joint: The joint where the sacrum connects to the ilium (hip bone).
• Sacral canal: The continuation of the vertebral canal through the sacrum.
• Sacral promontory: The prominent anterior edge of the body of the first sacral vertebra.

Học thuật

Noun

1. wedge-shaped bone consisting of five fused vertebrae forming the posterior part of the pelvis; its base connects with the lowest lumbar vertebra and its tip with the coccyx