What is true regarding the gamma efferent neuron?: (A) An 'A' group motor neuron with a smaller diameter than that of alpha efferent neurons, (B) Innervates intrafusal fibres, (C) Innervates muscle fibres that stretch annulospiral bulbar endings, (D) All of the above
Answer is D. (D) All of the above # SPINDLES have motor nerve supply of their own and these nerves constitute about 30% of fibers in ventral roots, and belong in Erlanger and Gasser's A g group.> Because of their characteristic 3-6 mm diameter in size or called g efferents of Leksell or small motor nerve system.> Larger b motor neurons innervate both intrafusal and extrafusal fibers.