Long-Chain Fibres in Spindles of Cat Superficial Lumbrical Muscles

A high incidence of long-chain fibres, i.e. of nuclear chain fibres that extend for 1 mm or more beyond the spindle capsule (Barker et al., 1976), was observed in spindle poles of cat superficial lumbrical muscles which were reconstructed over their whole length from serial transverse sections (Decorte et al., 1987).