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Table 1 Classification of Types and Subtypes 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

Type Inclusion criteria for the type Subtype Inclusion criteria for the subtype
Type I • origin of the muscular part of the medial epicondyle of the humerus
• the tendon was inserted to the palmar aponeurosis
A Tendon to muscle ratio < 1
B Tendon to muscle ratio 1–1,5
C Tendon to muscle ratio > 1,5
Type II • origin of the muscular part of the medial epicondyle of the humerus
• the tendon was bifurcated (lateral and medial division); the lateral division was inserted to the palmar aponeurosis, and medial division was inserted to the flexor retinaculuum of the wrist
A Tendon to muscle ratio < 1
B Tendon to muscle ratio 1–1,5
C Tendon to muscle ratio > 1,5
Type III “Rare variants” non-conforming definition Types I and II