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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