척추의 아랫부분에 위치하며 다섯 개의 척추뼈가 융합되어 형성된 삼각형 모양의 뼈로, 골반의 뒷벽을 구성함.
A large, triangular bone at the base of the spine that forms by the fusion of five sacral vertebrae and connects the lumbar spine to the coccyx.
예문:
"The sacrum serves as a critical link between the spine and the lower half of the body."
"Chronic pain in the sacrum area can often be attributed to sacroiliac joint dysfunction."
"In humans, the sacrum is composed of five vertebrae that fuse together during early adulthood."