Sacral vertebrae in the context of "Ilium (bone)"

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⭐ Core Definition: Sacral vertebrae

The sacrum (pl.: sacra or sacrums), in human anatomy, is a triangular bone at the base of the spine that forms by the fusing of the sacral vertebrae (S1–S5) between ages 18 and 30.

The sacrum situates at the upper, back part of the pelvic cavity, between the two wings of the pelvis. It forms joints with four other bones. The two projections at the sides of the sacrum are called the alae (wings), and articulate with the ilium at the L-shaped sacroiliac joints. The upper part of the sacrum connects with the last lumbar vertebra (L5), and its lower part with the coccyx (tailbone) via the sacral and coccygeal cornua.

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Sacral vertebrae in the context of Spinal nerve

A spinal nerve is a mixed nerve, which carries motor, sensory, and autonomic signals between the spinal cord and the body. In the human body there are 31 pairs of spinal nerves, one on each side of the vertebral column. These are grouped into the corresponding cervical, thoracic, lumbar, sacral and coccygeal regions of the spine. There are eight pairs of cervical nerves, twelve pairs of thoracic nerves, five pairs of lumbar nerves, five pairs of sacral nerves, and one pair of coccygeal nerves. The spinal nerves are part of the peripheral nervous system.

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LINKED FROM (PARENTS)
← Spinal nerve ← Sacral nerve ← Spinal root ← Spinal nerves ← Coccygeal nerve
LINKS TO (CHILDREN)
Human body → Bone → Vertebral column → Pelvic cavity → Ilium (bone) → Sacroiliac joint → Lumbar vertebrae → Coccyx →