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annulus

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annulus /an·nu·lus/ (an´u-lus) pl. an´nuli   [L.] anulus.
an·nu·lus or an·u·lus (ny-ls)
n. pl. an·nu·lus·es or an·nu·li (-l)
A circular or ring-shaped structure.
annulus.
See anulus.
annulus [an´u-lus] (pl. an´nuli) (L.)
alternate spelling of anulus.
annulus, anulus
pl. annuli, anuli [L.] a small ring or encircling structure.
atrioventricular annulus
a ring of Purkinje cells around the right A-V orifice that serves the myocardium and valves locally and also serves as an alternative connection between the atria and the ventricles.
fibrocartilaginous annulus
the circular pad which connects the tympanic membrane to the external acoustic meatus.
annuli fibrosi
1. four fibrous rings at the base of the heart to which the myocardium is attached, one around each A-V orifice and one each around the aorta and the pulmonary artery.
2. the intervertebral disks consist of a soft central pulpy nucleus and a peripheral annulus fibrosus.
annulus iridis
the iris consists of two rings, an inner smooth annulus iridus minoris, and an outer plicated part, the annulus iridis major.
annulus preputialis
the ring of skin marking the entrance to the cavity of the prepuce.
annulus sclerae
a roll of connective tissue on the inside of the sclera at the corneoscleral junction.
spermatic annulus
a small ring condenses around the proximal centriole of the spermatid.
annulus vaginalis
the ring through which the peritoneal cavity connects with the cavity of the vaginal tunic.
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They become decoupled from the main annulus and don't come back," he added.
Mars and Mercury may have formed from the scraps of Earth and Venus by Asian News International
Some years ago, Corus developed the 'pipe in pipe' - an inner pipe with an annulus between that and the outer sleeve that insulates the emerging oil against sea temperatures which can slow the flow.
Producing pipelines for across the globe; Issue of the week: Sub-sea ... by Evening Gazette (Middlesbrough, England)
Each of 248 species is illustrated with an excellent color photograph (which almost always shows both the tops and the undersides of sample fungi), and its cap, gills, stalk, and annulus are all described in meticulous detail, along with information with regard to where each species is most likely to be seen, and its edible or toxic characteristics.
Mushrooms and Other Fungi of the Midcontinental United States by Internet Bookwatch
 
 
 
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