In humans, the sacrum is a large, triangular bone at the base of the spine and at the upper, back part of the pelvic cavity, where it is inserted like a wedge between the two hip bones. Its upper part connects with the last lumbar vertebra, and its lower part with the coccyx (tailbone). Usually, it begins as five unfused vertebrae which begin to fuse between the ages of 16ââ¬â18 years and have usually completely fused into a single bone by the age of 34 years.
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授權類型 | 尺寸 | 像素 | 格式 | 點數 | |
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標準授權 | XS | 480 x 377 | JPG | 13 | |
標準授權 | S | 800 x 629 | JPG | 15 | |
標準授權 | M | 1954 x 1535 | JPG | 18 | |
標準授權 | L | 2522 x 1982 | JPG | 20 | |
標準授權 | XL | 3190 x 2507 | JPG | 22 | |
標準授權 | MAX | 5040 x 3960 | JPG | 23 | |
標準授權 | TIFF | 7128 x 5600 | TIF | 39 | |
進階授權 | UEL | 5040 x 3960 | JPG | 88 |
XS
S
M
L
XL
MAX
TIFF
UEL
標準授權 | 480 x 377 px | JPG | 13 點 |
標準授權 | 800 x 629 px | JPG | 15 點 |
標準授權 | 1954 x 1535 px | JPG | 18 點 |
標準授權 | 2522 x 1982 px | JPG | 20 點 |
標準授權 | 3190 x 2507 px | JPG | 22 點 |
標準授權 | 5040 x 3960 px | JPG | 23 點 |
標準授權 | 7128 x 5600 px | TIF | 39 點 |
進階授權 | 5040 x 3960 px | JPG | 88 點 |