Annular: Difference between revisions

Latest revision as of 06:34, 11 December 2024

Annular

An annular structure or pattern is one that is ring-shaped or forms a circle. The term "annular" is derived from the Latin word "annulus," meaning "little ring." In various scientific and medical contexts, "annular" is used to describe structures, patterns, or phenomena that exhibit a circular or ring-like appearance.

Medical Context[edit]

In medicine, "annular" is often used to describe certain types of lesions, rashes, or anatomical structures that have a ring-like shape. For example, annular lesions are circular skin lesions that may be seen in conditions such as tinea corporis (ringworm) or granuloma annulare.

Annular Lesions[edit]

Annular lesions are characterized by their ring-like appearance, often with a clear center and a raised or differently colored border. These lesions can be indicative of various dermatological conditions:

Tinea corporis: A fungal infection that presents as ring-shaped, scaly patches on the skin.
Granuloma annulare: A chronic skin condition that causes raised, reddish or skin-colored bumps arranged in a circle or ring.
Erythema multiforme: A hypersensitivity reaction that can cause target-like lesions, sometimes with an annular appearance.

Annular Ligament[edit]

In anatomy, the term "annular" is also used to describe certain ligaments that encircle a structure. For example, the annular ligament of the radius is a band of fibers that encircles the head of the radius, holding it in place within the elbow joint.

Astronomical Context[edit]

In astronomy, "annular" is used to describe a type of solar eclipse. An annular eclipse occurs when the Moon covers the center of the Sun, leaving a ring-like appearance of the solar disk visible around the edges. This happens when the Moon is too far from the Earth to completely cover the Sun, due to its elliptical orbit.

Engineering and Technology[edit]

In engineering, "annular" can refer to components or designs that incorporate ring-like structures. For example, an annular combustion chamber in a jet engine is a circular chamber where fuel and air are mixed and burned.

Also see[edit]

   This article is a medical stub. You can help WikiMD by expanding it!

   This article is a astronomy-related stub. You can help WikiMD by expanding it!

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-(an'-u-lar) [annulus, a ring]. Ring- like. A. Cartilage, the cricoid cartilage.
+Annular
-A. Finger, the ring-finger. A. Ligament, the ligament surrounding the wrist and the ankle. A. Muscle of Muller, the circular fibers of the ciliary muscle. A. Process, A. Protuberance, the pons varolii. A. Re- flex(of macula), a ring-like reflection some- times seen with the ophthalmoscope around the macula.
+An annular structure or pattern is one that is ring-shaped or forms a circle. The term "annular" is derived from the Latin word "annulus," meaning "little ring." In various scientific and medical contexts, "annular" is used to describe structures, patterns, or phenomena that exhibit a circular or ring-like appearance.
-Annulus ian'-u-lus) [see Annular]. A ring- shaped or circular opening. A. abdomin- alis, the external or internal abdominal ring.
+== Medical Context ==
+In medicine, "annular" is often used to describe certain types of lesions, rashes, or anatomical structures that have a ring-like shape. For example, annular lesions are circular skin lesions that may be seen in conditions such as [[tinea corporis]] (ringworm) or [[granuloma annulare]].
-A. abdominis, the inguinal ring. A. ciliaris, the boundary between the iris and the choroid.
+=== Annular Lesions ===
+Annular lesions are characterized by their ring-like appearance, often with a clear center and a raised or differently colored border. These lesions can be indicative of various dermatological conditions:
-A. fibrosus. 1. The external part of the intervertebral discs. 2. Firm connective tis- sue containing elastic fibers surrounding the auriculoventricular openings of the heart.
+* '''[[Tinea corporis]]''': A fungal infection that presents as ring-shaped, scaly patches on the skin.
+* '''[[Granuloma annulare]]''': A chronic skin condition that causes raised, reddish or skin-colored bumps arranged in a circle or ring.
+* '''[[Erythema multiforme]]''': A hypersensitivity reaction that can cause target-like lesions, sometimes with an annular appearance.
-Syn., Annulus -fibrosus atrioventricular.
+=== Annular Ligament ===
+In anatomy, the term "annular" is also used to describe certain ligaments that encircle a structure. For example, the annular ligament of the radius is a band of fibers that encircles the head of the radius, holding it in place within the elbow joint.
-A. inguinalis abdominalis, the internal abdominal ring. A. inguinalis cutaneus, the external abdominal ring. A. membranse tympani, an incomplete bony ring that forms the fetal auditory process of the tem- poral bone. A. migrans, a disease of the tongue marked by crescentic bands of a light -colored rash which spread over its dorsal surface and sometimes over the sides and under surface. Syn., Annulus errans.
+== Astronomical Context ==
+In astronomy, "annular" is used to describe a type of solar eclipse. An [[annular eclipse]] occurs when the Moon covers the center of the Sun, leaving a ring-like appearance of the solar disk visible around the edges. This happens when the Moon is too far from the Earth to completely cover the Sun, due to its elliptical orbit.
-A. osseus, the tympanic plate. A. ovalis, the rounded or oval margin of the foramen ovale. A. tracheae, a tracheal ring. A.
+== Engineering and Technology ==
+In engineering, "annular" can refer to components or designs that incorporate ring-like structures. For example, an annular combustion chamber in a jet engine is a circular chamber where fuel and air are mixed and burned.
-umbilicus, the umbilical ring. A. ventri- culi, the pylorus.
+== Also see ==
-{{stub}}
+* [[Ringworm]]
-{{dictionary-stub1}}
+* [[Granuloma annulare]]
+* [[Annular eclipse]]
+* [[Annular ligament]]
+{{Medical-stub}}
+{{Astronomy-stub}}
+[[Category:Medical terminology]]
+[[Category:Dermatology]]
+[[Category:Astronomy]]
+[[Category:Engineering]]