marginal sinus

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marginal sinus [′mär·jən·əl ′sī·nəs]

(anatomy)

One of the small, bilateral sinuses of the dura mater which skirt the edge of the foramen magnum, usually uniting posteriorly to form the occipital sinus.

terminal sinus

(embryology)

An enlarged venous sinus incompletely encircling the margin of the placenta.

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