Palmar crease: Difference between revisions

Latest revision as of 11:36, 15 February 2025

Palmar Crease[edit]

A palmar crease is a line that appears on the palm of the hand. These creases are formed during the development of the fetus and are present at birth. The pattern and number of palmar creases can vary among individuals and can sometimes be associated with certain medical conditions.

Types of Palmar Creases[edit]

There are typically three main palmar creases on a human hand:

The distal transverse palmar crease, also known as the "head line," runs across the upper part of the palm.
The proximal transverse palmar crease, also known as the "heart line," runs below the distal crease.
The radial longitudinal crease, also known as the "life line," curves around the base of the thumb.

Single Transverse Palmar Crease[edit]

A single transverse palmar crease, commonly referred to as a "simian line," is a single line that runs across the palm, merging the distal and proximal transverse creases into one. This feature is present in approximately 1% of the general population.

Medical Significance[edit]

The presence of a single transverse palmar crease can be a normal variant, but it is also associated with certain genetic disorders and syndromes. For example, it is more commonly observed in individuals with Down syndrome, Fetal alcohol syndrome, and other chromosomal abnormalities.

Development[edit]

Palmar creases develop during the 12th week of gestation as the fetus moves its hands. The creases are formed by the flexion of the hand and are influenced by genetic and environmental factors. Once formed, the pattern of palmar creases remains unchanged throughout a person's life.

Related Pages[edit]

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-'''Palmar creases''', also known as '''simian lines''', are the lines in the [[palm]] of the human hand. They are formed during fetal development and are unique to each individual. The three major palmar creases are the [[radial longitudinal crease]], the [[proximal transverse crease]], and the [[distal transverse crease]].
+== Palmar Crease ==
-== Formation ==
+[[File:Simian_crease2.jpg|thumb|right|A hand showing a single transverse palmar crease, also known as a simian line.]]
-Palmar creases are formed in the womb around the 12th week of gestation. They are influenced by both genetic and environmental factors. The creases are formed where the skin on the palm folds or bends. They are permanent and do not change throughout a person's life.
+A '''palmar crease''' is a line that appears on the [[palm]] of the [[hand]]. These creases are formed during the development of the [[fetus]] and are present at birth. The pattern and number of palmar creases can vary among individuals and can sometimes be associated with certain medical conditions.
 == Types of Palmar Creases ==
-There are three major types of palmar creases: the radial longitudinal crease, the proximal transverse crease, and the distal transverse crease. The radial longitudinal crease runs from the base of the thumb towards the wrist. The proximal transverse crease runs across the palm, roughly parallel to the base of the fingers. The distal transverse crease runs across the palm, closer to the fingers than the proximal transverse crease.
-== Clinical Significance ==
+There are typically three main palmar creases on a human hand:
-In some cases, the presence of a single palmar crease (known as a [[simian crease]]) can be a sign of a genetic disorder such as [[Down syndrome]] or [[Fetal alcohol syndrome]]. However, a single palmar crease can also be found in people without any genetic disorders. It is important to note that the presence of a single palmar crease is not a definitive diagnosis of any condition, but rather a possible indicator that further testing may be needed.
+* The '''distal transverse palmar crease''', also known as the "head line," runs across the upper part of the palm.
+* The '''proximal transverse palmar crease''', also known as the "heart line," runs below the distal crease.
+* The '''radial longitudinal crease''', also known as the "life line," curves around the base of the thumb.
+== Single Transverse Palmar Crease ==
+A '''single transverse palmar crease''', commonly referred to as a "simian line," is a single line that runs across the palm, merging the distal and proximal transverse creases into one. This feature is present in approximately 1% of the general population.
+=== Medical Significance ===
+The presence of a single transverse palmar crease can be a normal variant, but it is also associated with certain [[genetic disorders]] and [[syndromes]]. For example, it is more commonly observed in individuals with [[Down syndrome]], [[Fetal alcohol syndrome]], and other chromosomal abnormalities.
+== Development ==
+Palmar creases develop during the 12th week of [[gestation]] as the [[fetus]] moves its hands. The creases are formed by the flexion of the hand and are influenced by genetic and environmental factors. Once formed, the pattern of palmar creases remains unchanged throughout a person's life.
+== Related Pages ==
-== See Also ==
 * [[Dermatoglyphics]]
-* [[Fingerprint]]
+* [[Down syndrome]]
-* [[Hand analysis]]
+* [[Fetal alcohol syndrome]]
+* [[Genetic disorders]]
-== References ==
-<references />
 [[Category:Anatomy]]
-[[Category:Dermatoglyphics]]
+[[Category:Human development]]
-[[Category:Medical signs]]
-{{anatomy-stub}}