Human anatomy

• Annulus fibrosus disci intervertebralis
  Annulus fibrosus disci intervertebralis
  Each intervertebral fibrocartilage is composed, at its circumference, of laminæ of fibrous tissue and fibrocartilage, forming the annulus fibrosus.-Spelling notes:...
  
  , spinal structure
• Annulus of Zinn
  Annulus of Zinn
  The annulus of Zinn, also known as the annular tendon or common tendinous ring, is a ring of fibrous tissue surrounding the optic nerve at its entrance at the apex of the orbit. It is the origin for five of the six extraocular muscles...
  
  , a.k.a annular tendon or annulus tendineus communis, around the optic nerve
• Annular ligament (disambiguation)
  Annular ligament (disambiguation)
  Annular ligament means shaped like a ring and may refer to:* Annular ligament of femur* Annular ligaments of fingers* Annular ligament of radius* Annular ligaments of trachea* Annular ligaments of toes* Annular stapedial ligament...
  
  
• Digitus annularis, a.k.a ring finger
  Ring finger
  The ring finger is the fourth digit of the human hand, and the second most ulnar finger, located between the middle finger and the little finger. It is also called digitus medicinalis, the fourth finger, digitus annularis, digitus quartus, or digitus IV in anatomy.- Etymology :According to László A...
  
  
• Annulus femoralis, a.k.a femoral ring
  Femoral ring
  The femoral ring is the base of the femoral canal. It is directed upward and is oval in form, its long diameter being directed transversely and measuring about 1.25 cm.-Boundaries:The femoral ring is bounded as follows:...
  
  
• Annulus inguinalis superficialis, a.k.a superficial inguinal ring
  Superficial inguinal ring
  The superficial inguinal ring is an anatomical structure in the anterior wall of the human abdomen. It is a triangular opening that forms the exit of the inguinal canal, which houses the ilioinguinal nerve, the genital branch of the genitofemoral nerve, and the spermatic cord or the round ligament...
  
  
• Annulus inguinalis profundus, a.k.a deep inguinal ring
  Deep inguinal ring
  The deep inguinal ring is the entrance to the inguinal canal.-Location:...
  
  
• Annulus fibrosus cordis, a.k.a fibrous rings of heart

Other

• Annulus (construction), outer gear ring in an Epicyclic gearing
  Epicyclic gearing
  Epicyclic gearing or planetary gearing is a gear system consisting of one or more outer gears, or planet gears, revolving about a central, or sun gear. Typically, the planet gears are mounted on a movable arm or carrier which itself may rotate relative to the sun gear...
  
  
• Annulus (mathematics)
  Annulus (mathematics)
  In mathematics, an annulus is a ring-shaped geometric figure, or more generally, a term used to name a ring-shaped object. Or, it is the area between two concentric circles...
  
  , geometric figure
• Annulus (mycology)
  Annulus (mycology)
  An annulus is the ring like structure sometimes found on the stipe of some species of mushrooms. The annulus represents the remaining part of the partial veil, after it has ruptured to expose the gills or other spore-producing surface. An annulus may be thick and membranous, or it may be cobweb-like...
  
  , structure on mushroom
• Annulus (zoology)
  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....
  
  , growth-induced feature
• Annulus (firestop)
  Annulus (firestop)
  The Annulus, or annular space, is the space between a penetrant and whatever surrounds it, such as the sides of an opening or a sleeve, as the case may be.Sometimes an annulus can be "offset", meaning that the penetrant is not centred...
  
  , site of construction issue
• Annulus (oil well)
  Annulus (oil well)
  The annulus of an oil well refers to any void between any piping, tubing or casing and the piping, tubing, or casing immediately surrounding it. It is named after the corresponding geometric concept...
  
  , void between concentric cylinders
• The Annulus
  The Annulus
  The Annulus is a fictional criminal organization featured in the Azteca Productions' Universe created by Richard Dominguez. The Annulus is a South American-based secret cabal of businessmen, each a notorious drug lord from a different part of the world...
  
  , fictional organization in comics
• Annulation
  Annulation
  Annulation in organic chemistry is a chemical reaction in which a new ring is constructed on another molecule ....
  
  , type of ring-producing chemical reaction

See also

• Annulet (disambiguation)
• Annular eclipse
• Annular hurricane
  Annular hurricane
  An annular hurricane, also known as a truck tire or doughnut hurricane, is a tropical cyclone in the Atlantic or Eastern Pacific Oceans that features a large, symmetric eye surrounded by a thick ring of intense convection. This type of storm is not prone to the fluctuations in intensity associated...
  
  
• Annular combustor, design option in engine