annulus

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annulus

 [an´u-lus] (pl. an´nuli) (L.)
alternate spelling of anulus.

annulus

/an·nu·lus/ (an´u-lus) pl. an´nuli   [L.] anulus.

annulus

(ăn′yə-ləs)
n. pl. annu·luses or annu·li (-lī′)
1. A ringlike figure, part, structure, or marking, such as a growth ring on the scale of a fish.
2.
a. A ring or group of thick-walled cells around the sporangia of many ferns that functions in spore release.
b. The ringlike remains of a broken partial veil, found around the stipes of certain mushrooms.

annulus

annulus

Any ring-like structure (e.g., mitral valve annulus).

annulus

Any ring-like structure.

annulus

  1. the ring of cells in the moss or fern capsule which splits to allow the liberation of spores.
  2. a ring of tissue surrounding the stalk in the fruiting bodies of the BASIDIOMYCOTA fungi.

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.
References in periodicals archive ?
Tehrani, "Viscoplastic Flow in Centered Annuli, Pipes and Slots," IEC Res.
grandis, as determined from annuli in this study, was much faster than reported by others from Canada and Minnesota (McCuaig and Green, 1983; Hanson et al.
2] (Eq 19) and the material in the thick annulus is doubled; the minimum energy in the thin and thick annuli is calculated as [Er.
The age adjustment formula corrected for the collection of samples across different months of the year by adjusting observed-age estimates to account for the period of annuli formation, spawning period (birth date), and the date of capture.
An Accurate Slot Model for Non-Newtonian Fluid Flow Through Eccentric Annuli," SPE J(Oct.
n-1] = the distance from ray focus to the nth and (n-1)th annuli, respectively.
It is generally theorized that the shift was the result of one of two scenarios: either the fish population experienced an actual decrease in length-at-age or the age readers were over-aging fish by counting marks other than annuli.
Annuli were clearly differentiated under reflected light on a black background: the opaque zones are milky in appearance and the hyaline zones relatively transparent (Fig.
These ten combinations were used for all available annuli and then repeated by using the last annulus only, for a total of twenty different methods.
When viewed with transmitted light, permit otoliths have opaque (dark) annuli that alternate with translucent (light) zones (Fig.
Moseley (1966) used scale annuli to age red snapper to age 4 yr and advanced spawning as the causal factor in check formation.