The Sydney line: an underestimated hand mark.

The Sydney line: an underestimated hand mark.

The Sydney line: an underestimated hand mark in Palmistry!

Many years ago the Sydney line was discovered as another hand line mark for Down’s syndrome – the other handmark is the ‘famous’ simian crease. How come that the diagnostic significance of the Sydney line is still underestimated?

This article describes an overview of the global palmistry- & scientific research related to the Sydney line.

In 1967 a Belgian study on Down’s syndrome was published which pointed out that besides the ‘famous’ simian line, an ‘extended proximal palmar crease’ is also a significant feature in Down’s syndrome.

One year later some researchers from Sydney, Australia (Purvis-Smith & Menser, 1968) reported that this fascinating palmar line is also frequently found in the hands of patients with congenital rubella – from that point researchers adopted the name used by researchers from Sydney: the name of the ‘Sydney line’ was established!

S.G. Purvis-Smith (Australian researcher) described the Sydney line as follows:

“A sydney line occurs where the proximal transverse crease extends beyond the midline axis of the fifth finger towards the ulnar border of the palm.”

Dozens of studies have confirmed the diagnostic significance of the Sydney line – sometimes the discriminative value is even higher compared to the simian crease! The significance of the Sydney line can be related to various medical problems (such as: Down’s syndrome, leukemia, Alzheimer dementia), and psychological problems (in general: developmental problems at young ages).

You can read more about the Sydney line & the simian crease in these extended articles:

The Sydney line: an underestimated hand mark
The simian line: a ‘notorious’ hand crease
More hand analysis news

The Sydney line: a hand mark for Down's syndrome, leukemia, Alzheimer dementia, and psychological problems.

Hand analysis: hands & science.

Scientific hand analysis mini-course:
palmistry course on the basis of scientific facts!

A 33 pages hand analysis course about how diseases, syndromes and psychological problems manifest in the features of the human hand.

What can you expect from this online mini-course ‘Scientific Hand Analysis’? – A unique palmistry course:


Why is Down’s syndrome often featured with a ‘simian crease‘ or a Sydney line? About diseases, syndromes and hand characteristics.


What are common hand features in schizophrenia? About the link between the brain, dermatoglyphics, and other hand features.


About hand features that related to developmental problems, personality characteristics, and low intelligence.

Palm reading: scientific hand analysis course.

Scientific palmistry course
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Medical palm reading: about the nails, dermatoglyphics, palmar lines and the fingers

The simian line is often found in Down syndrome, but also frequently seen in Asian populations.

The simian line is often found in Down syndrome, but also frequently seen in Asian populations.

The simian line

The simian line is a ‘notorious’ hand crease and well-known for it’s significance in Down’s syndrome – more than half of these people have a simian line in 1 or both hands, while only about 1% of healthy populations have a simian line. Nevertheless, this line is also frequently observed in the hands of certain ethnic population – especially in Asians!

In 1866, R.L. Down discovered in 1906 the relationship between the simian crease and Down’s syndrome. The simian line is also know as: the ‘simian crease’ or ‘single palmar transverse crease’.

‘Healthy hands’ with the simian line usually do not have the other stereotypical hand features related related to Down syndrome are missing (examples of other Down syndrome-related hand features are: a short thumb, curved little finger, certain dermatoglyphic patterns in the palm and fingerprints).

In some (Asian) populations is extraordinary frequently seen, such as: Pygmies: 34.7 %; Gypsies: 14.3 %; Chinese: 13.0 %; Koreans: 11.2 % – more percentages are presented in the full article.

Deciphering the simian line.

The simian line: a notorious hand crease
The simian line: merging of mind and heart
The simian crease, down syndrome & other disorders
Do you have a simian line?