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The sacrum (pl.: sacra or sacrums [1]), in human anatomy, is a large, triangular bone at the base of the spine that forms by the fusing of the sacral vertebrae (S1–S5) between ages 18 and 30. [ 2 ] The sacrum situates at the upper, back part of the pelvic cavity , between the two wings of the pelvis .
The deep dorsal sacrococcygeal ligament (ligamentum sacrococcygeum posterius profundum) is a continuation of the posterior longitudinal ligament. [1] A flat band arising inside the sacral canal, posteriorly at the orifice of the fifth sacral segment, it descends to the dorsal surface of the coccyx under its longer fellow described below.
There are five sacral vertebrae (S1–S5) which are fused in maturity, into one large bone, the sacrum, with no intervertebral discs. [18] The sacrum with the ilium forms a sacroiliac joint on each side of the pelvis , which articulates with the hips .
The sacroiliac joint or SI joint (SIJ) 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 strong, supporting the entire weight of the upper body.
The number of vertebrae in a region can vary but overall the number remains the same. In a human spinal column, there are normally 33 vertebrae. [3] The upper 24 pre-sacral vertebrae are articulating and separated from each other by intervertebral discs, and the lower nine are fused in adults, five in the sacrum and four in the coccyx, or tailbone.
The superior-most node is situated in the groin, deep to the inguinal ligament, and is termed the Cloquet's node (also Rosenmuller's node). [7] It can instead be considered as the inferior-most of the external iliac lymph nodes.
Sacrum is the neuter form of the Latin adjective sacer, meaning "holy" or "sacred". It is a large, triangular bone at the base of the spine and at the upper and back part of the pelvic cavity. Sacrum may also refer to: Canticum Sacrum ad Honorem Sancti Marci Nominis, a 17-minute choral-orchestral piece composed in 1955 by Igor Stravinsky
Sacral may refer to: Sacred, associated with divinity and considered worthy of spiritual respect or devotion; Of the sacrum, a large, triangular bone at the base of ...