a ring-shaped muscle that relaxes or tightens to open or close a passage or opening in the body. examples are the anal sphincter (around the opening of the anus) and the pyloric sphincter (at the lower opening of the stomach).
the cerebrum
the cerebellum
唾液腺.
the spinal cord
the perineum
the hipbone
脊髄.
the spinal cord
the spinal cord
a brain
a ganglion
a romance
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