Annulus (or anulus) or annular indicates a

ring (The) Ring(s) may refer to: * Ring (jewellery), a round band, usually made of metal, worn as ornamental jewelry * To make a sound with a bell, and the sound made by a bell Arts, entertainment, and media Film and TV * ''The Ring'' (franchise), a ...

- or donut-shaped area or structure. It may refer to:

Human anatomy

* ''

Anulus fibrosus disci intervertebralis An intervertebral disc (British English), also spelled intervertebral disk (American English), lies between adjacent vertebrae in the vertebral column. Each disc forms a fibrocartilaginous joint (a symphysis), to allow slight movement of the ver ...

'', spinal structure *

Annulus of Zinn 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 ext ...

, a.k.a. annular tendon or ''anulus tendineus communis'', around the optic nerve *

Annular ligament (disambiguation) Annular ligament may refer to: * Zona orbicularis, Annular ligament of femur * Annular ligaments of fingers * Annular ligament of radius *Annular ligament of stapes (also known as the stapediovestibular joint) * Annular ligaments of trachea * Annul ...

* ''Digitus anularis'', a.k.a.

ring finger The ring finger, third finger, fourth finger, leech finger, or annulary is the fourth digit of the human hand, located between the middle finger and the little finger. Sometimes the term ring finger only refers to the fourth digit of a left-ha ...

* ''Anulus ciliaris'', a.k.a.

ciliary body The ciliary body is a part of the eye that includes the ciliary muscle, which controls the shape of the lens, and the ciliary epithelium, which produces the aqueous humor. The aqueous humor is produced in the non-pigmented portion of the ciliary ...

* ''Anulus femoralis'', a.k.a.

femoral ring The femoral ring is the opening at the proximal, abdominal end of the femoral canal, and represents the (superiorly directed/oriented) base of the conically-shaped femoral canal. The femoral ring is oval-shaped, with its long diameter being direc ...

* ''Anulus inguinalis superficialis'', a.k.a.

superficial inguinal ring The inguinal canal is a passage in the anterior abdominal wall on each side of the body (one on each side of the midline), which in males, convey the spermatic cords and in females, the round ligament of the uterus. The inguinal canals are large ...

* ''Anulus inguinalis profundus'', a.k.a.

deep inguinal ring The inguinal canal is a passage in the anterior abdominal wall on each side of the body (one on each side of the midline), which in males, convey the spermatic cords and in females, the round ligament of the uterus. The inguinal canals are large ...

* ''Anuli fibrosi cordis'', a.k.a.

fibrous rings of heart In cardiology, the cardiac skeleton, also known as the fibrous skeleton of the heart, is a high-density homogeneous structure of connective tissue that forms and anchors the valves of the heart, and influences the forces exerted by and through the ...

* ''Anulus umbilicalis '', a.k.a. umbilical ring

Biology

Annulus (botany) An annulus in botany is for ferns an arc or a ring of specialized cells on the sporangium. These cells are arranged in a single row, and are associated with the release or dispersal of spores. In mosses it is a ring of cells around the tip of the s ...

, structure on fern and moss sporangia *

Annulus (mycology) An annulus is the ring-like or collar-like structure sometimes found on the Stipe (mycology), stipe of some species of mushrooms. The annulus represents the remnants of the partial veil, after it has ruptured to expose the gill (mushroom), gills ...

, structure on mushroom *

Annulus (zoology) In zoology, an annulus is an external circular ring. Annuli are commonly found in segmented animals such as earthworms and leeches. The bodies of these annelids are externally marked by annuli that are arranged in series with each other. An annul ...

, an external circular ring

Other

Annulus (construction) Annulus (or anulus) or annular indicates a ring- or donut-shaped area or structure. It may refer to: Human anatomy * ''Anulus fibrosus disci intervertebralis'', spinal structure * Annulus of Zinn, a.k.a. annular tendon or ''anulus tendineus comm ...

, outer gear ring in an

epicyclic gearing An epicyclic gear train (also known as a planetary gearset) is a gear reduction assembly consisting of two gears mounted so that the center of one gear (the "planet") revolves around the center of the other (the "sun"). A carrier connects the ...

Annular lake An impact crater lake is a lake inside a depression caused by the impact of a meteor. It is also known as an annular lake in cases where the water body is shaped like a ring, as many impact crater lakes are. Examples One of the largest impa ...

, a ring-shaped lake caused by meteor impact *

Annulus (mathematics) In mathematics, an annulus (: annuli or annuluses) is the region between two concentric circles. Informally, it is shaped like a ring or a hardware washer. The word "annulus" is borrowed from the Latin word ''anulus'' or ''annulus'' meaning 'l ...

, the shape between two concentric circles *

Annulus (firestop) The annulus, or annular space, is the space between a penetrant and anything that surrounds it, such as the sides of an opening or a sleeve A sleeve (, a word allied to '' slip'', cf. Dutch ) is the part of a garment that covers the arm, ...

, site of construction issue * Annular piston, a ring-shaped piston *

Annulus (well) The annulus of an oil well or water well is any void between any piping, tubing or casing and the piping, tubing, or casing immediately surrounding it.SchlumbergeOilfield Glossary: Term 'annulus', retrieved 18 February 2010. It is named after ...

, void between concentric cylinders *

Annular blowout preventer A blowout preventer (BOP) (pronounced B-O-P) is a specialized valve or similar mechanical device, used to seal, control and monitor oil and gas wells to prevent blowouts, the uncontrolled release of crude oil or natural gas from a well. They ...

, device for sealing oil and gas wells *

Annulation In organic chemistry, annulation (; occasionally annelation) is a chemical reaction in which a new ring is constructed on a molecule. : Examples are the Robinson annulation, Danheiser annulation and certain cycloadditions. Annular molecules a ...

, type of ring-producing chemical reaction

Human anatomy

Biology

Other

See also