SYN: ring (1). [L.]
- a. ciliaris SYN: ciliary body.
- a. conjunctivae [TA] SYN: conjunctival ring.
- a. femoralis [TA] SYN: femoral ring.
- a. fibrosus [TA] 1. SYN: (right and left) fibrous rings of heart, under ring. 2. SYN: a. fibrosus of intervertebral disk.
- a. fibrosus of intervertebral disk [TA] the ring of fibrocartilage and fibrous tissue forming the circumference of the intervertebral disk; surrounds the nucleus pulposus, which is prone to herniation when the annulus fibrosus is compromised. SYN: a. fibrosus disci intervertebralis [TA], a. fibrosus (2) [TA], fibrous ring of intervertebral disk, fibrous ring (2).
- a. hemorrhoidalis SYN: hemorrhoidal zone.
- a. iridis [TA] SYN: border of iris.
- a. lymphoideus pharyngis [TA] SYN: pharyngeal lymphatic ring.
- a. ovalis SYN: limbus fossae ovalis.
- a. tendineus communis SYN: common tendinous ring of extraocular muscles.
- a. tympanicus SYN: tympanic ring.
- a. umbilicalis SYN: umbilical ring.
- Vieussens a. SYN: limbus fossae ovalis.
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anu·lus (anґu-ləs) gen. and pl. aґnuli [L., from anus ring] ring: preferred spelling in official terminology (TA) for a circular or ringlike structure; spelled also annulus. See also circle and circulus.Medical dictionary. 2011.