Muscle Spindle and Comparison of Fish Muscle Spindle with Other Vertebrates

Abstract

The aim of this study is to bring together the literature knowledge on musculespindels that has been made up to until now and compare fish muscule spindels with othervertebrates. Muscle spindles are stretch receptor of skeletal muscles which detect the rate anddegree of muscle length. According to the available literature, this review is considered as aone in making a comparison of fish muscle spindle and other vertebrates. Fish muscle spindlepossesses single intrafusal muscle fiber similar to snake and lizard muscle spindle and have adouble capsule similar in all vertebrates have studied. No significant differences in the lengthand diameter of intrafusal muscle fibers by comparison of muscle size. In fish and othervertebrates muscle spindles are supplied with one sensory ending (exception in mammalianmay, in addition, be supplied with one or more secondary sensory endings) and receive itsmotor innervation from branches of axons that also innervate extrafusal muscle fibers. Noinvestigation has been done about motor innervation of fish muscle spindle.