Fig. 22. Light micrograph of an “atypical muscle spindle” in hman extraocular muscle. The terminal fiber spirals around a single extrafusal muscle fiber and terminates in a small end bulb. Electron-microscopic examination has produced evidence that these are actually motor endings.226 (silver stain) (Daniel P: Spiral nerve endings in the extrinsic eye muscles of man. J Anat 80:189, 1946.)