(redirected from R.'s arc)


Jean, French anatomist and botanist, 1577-1657. See: Riolan anastomosis, Riolan arc, Riolan arcades, Riolan bones, Riolan bouquet, Riolan muscle.


Jean, French anatomist, 1577–1657.

Riolan's arch

, R.'s arc
A vascular arch within the mesentery of the transverse colon.

Riolan's bouquet

The two ligaments and three muscles attached to the styloid process of the temporal bone.

Riolan's muscle

The ciliary portion of the orbicularis oculi.