orbiculus

(redirected from orbiculi)

orbiculus

/or·bic·u·lus/ (or-bik´u-lus) pl. orbi´culi   [L.] a small disk.

orbiculus

(or-bik'u-lus) plural.orbiculi [L., little circle]
Muscle surrounding an orifice; a sphincter muscle.

orbiculus ciliaris

The portion of the ciliary body consisting of a bandlike zone lying directly anterior to the ora serrata. Synonym: ciliary ring

orbiculus oris

The circular muscle surrounding the mouth. It is a muscle of facial expression, innervated by the facial nerve.