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Annular lake, a ring-shaped lake caused by meteor impact; Annulus (mathematics), the shape between two concentric circles; Annulus (mycology), structure on mushroom; Annulus (firestop), site of construction issue; Annulus (zoology), an external circular ring; Annular piston, a ring-shaped piston; Annulus (well), void between concentric cylinders
The common tendinous ring, also known as the annulus of Zinn or annular tendon, is a ring of fibrous tissue surrounding the optic nerve at its entrance at the apex of the orbit. It is the common origin of the four recti muscles of the group of extraocular muscles. It can be used to divide the regions of the superior orbital fissure. [1]
See also fissure and suture. community An ecological assemblage of plants that characteristically occur together. compound Composed of several parts, e.g. a leaf composed of multiple leaflet s, a gynoecium composed of multiple carpel s, or an inflorescence made up of multiple smaller inflorescences. compound palmate
An anal fissure is a break or tear in the skin of the anal canal. Anal fissures may be noticed by bright red anal bleeding on toilet paper and undergarments, or sometimes in the toilet. If acute they are painful after defecation , [ 1 ] but with chronic fissures, pain intensity often reduces and becomes cyclical.
The adjectival form is annular (as in annular eclipse). The open annulus is topologically equivalent to both the open cylinder S 1 × (0,1) and the punctured plane.
Anal fistula is a chronic abnormal communication between the anal canal and the perianal skin. [1] An anal fistula can be described as a narrow tunnel with its internal opening in the anal canal and its external opening in the skin near the anus. [2]
The anterior median fissure of the spinal cord is a deep midline groove of the anterior spinal cord. [1]: 486 It divides the white matter of the anterior spinal cord nearly in two. [1]: 487 The spinal pia mater extends into the fissure to line the surfaces of the spinal cord. [1]: 453
A fissure in the lava field of Þingvellir National Park, Iceland. A ground fissure, also called an earth fissure, is a long, narrow crack or linear opening in the Earth's crust. Ground fissures can form naturally, such as from tectonic faulting and earthquakes, or as a consequence of human activity, such as oil mining and groundwater pumping.