Annulus - Definition of Annulus at Dictionary.com a free online dictionary with ... The presence or absence of an annulus is often used to identify the species of ...
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annulus Any ringlike structure, such as superficial rings on leeches.
annulus In fern sporangia, ...
The four Recti (Fig. 889) arise from a fibrous ring (annulus tendineus communis) which surrounds the upper, medial, and lower margins of the optic foramen and encircles the optic nerve (Fig. 890).
Surrounding the inside of the pore is a nonmembranous material organized into an annulus that extends spoke-like structures toward the center of the small channel.
Unlike darkfield, however, this technique requires a specialized microscope objective that includes a "phase annulus" - a ring-shaped coating on one of the lens elements - that must match the incoming cone.
The thin-walled lip cells of each sporangium separate.
The annulus slowly straightens out.
Then the annulus snaps forward expelling the spores.
Joints and ligaments of torso Vertebral column
articulations of vertebral bodies: anterior longitudinal ligament - posterior longitudinal ligament - intervertebral disc (annulus fibrosus, nucleus pulposus) ...
 See also: Cells, Trans, Tissue, Membrane, Human
  
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