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Table 4 Comparison of measurements between types I and II of the palmaris longus muscle

From: Anatomical variations of the palmaris longus muscle including its relation to the median nerve – a proposal for a new classification

Morphometric parameter

Type of the palmaris longus

p-value

Type I

Type II

Forearm length [mm]

254.8 (24.3)

252.0 (13.6)

0.7181

Forearm circumference [mm]

212.5 (24.8)

217.2 (22.0)

0.5107

Width between processes

55.4 (4.2)

54.1 (4.0)

0.2788

Thickness between processes

163.9 (21.4)

170.2 (15.5)

0.1883

The length of the belly

115.0 (21.6)

107.4 (19.5)

0.1510

The length of the tendon

155.9 (29.4)

140.0 (32.7)

0.2614

The thickness of the tendon at the ‘muscle-tendon’ junction

1.7 (0.7)

2.2 (0.7)

0.0831

The width of the tendon at the ‘muscle-tendon’ junction

3.7 (1.6)

4.0 (1.7)

0.9361

The thickness of the tendon at the insertion point

2.1 (1.0)

1.6 (0.4)

0.0905

The width of the tendon at the insertion point

4.4 (1.4)

3.0 (1.0)

0.0018

The width of the central portion of the tendon

4.0 (1.2)

3.4 (1.2)

0.1216

The width of the tendon where the tendon crosses the median nerve

3.9 (0.9)

3.4 (1.7)

0.4222

The thickness of the tendon where the tendon crosses the median nerve

1.2 (0.4)

1.1 (0.2)

0.7788

Distance from the midportion of the interstyloid line to the point where the median nerve crosses the tendon

32.0 (7.4)

28.5 (5.8)

0.3773