title: The fine structure of the guinea-pig muscle spindle.
mesh_terms: D000818:Animals; D002415:Cats; D002467:Cell Nucleus; D006168:Guinea Pigs / Q000033:anatomy & histology*; D008297:Male; D008854:Microscopy, Electron; D009470:Muscle Spindles / Q000166:cytology*; D009132:Muscles / Q000294:innervation; D051381:Rats; D013045:Species Specificity