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Table 1 Classification of mechanoreceptors, by Freeman and Wyke [17]

From: Morphological study of mechanoreceptors in collateral ligaments of the ankle joint

Type Name Feature Size (μm) Characteristics
I Ruffini Round shaped, thinly myelinated, connected by nerve fibers; 100 × 40 Low threshold, slowly adapted
II Pacini Column or cone shaped, thickly myelinated; 280 × 120 Low threshold, rapidly adapted
III Golgi Spindle shaped, thinly myelinated, connected by thicker nerve fibers 600 × 100 Low threshold, slowly adapted
IV Free nerve endings Non-myelinated, irregular; diameter 0.5 ~ 5 Transmit nociceptive sensation