title: Intrafusal muscle fibre types in frog spindles.
abstract: Muscle spindles from bullfrog semitendinosus, iliofibularis and sartorius muscles were examined with light and electron microscopy. Four types of intrafusal muscle fibre were identified according to their diameter, central nucleation and reticular zone arrangement: a large nuclear bag fibre, a medium nuclear bag fibre, and two types of small nuclear chain fibres with and without a reticular zone, respectively. It is suggested that they are comparable to the nuclear bag1, bag2 and chain fibres in mammalian muscle spindles.
authors.affiliation: Department of Physiology, Nagoya University School of Medicine, Japan.
authors.forename: F H
authors.initials: FH
authors.lastname: Diwan
authors.forename: F
authors.initials: F
authors.lastname: Ito
mesh_terms: D000818:Animals; D008854:Microscopy, Electron; D009470:Muscle Spindles / Q000166:cytology* / Q000648:ultrastructure; D009132:Muscles / Q000166:cytology* / Q000648:ultrastructure; D011892:Rana catesbeiana / Q000033:anatomy & histology*