In voluntary muscle, sensory nerves end in end bulbs and Muscles spindles (Neuromuscular spindles). The muscle spindles, is a cylindrical elongated structure within which are one or several muscle fibres, connective tissue blood vessels and myelinated nerve fibres.
The whole is enclosed in a connective tissue capsule, which is pierced, at various points by one or more nerve fibres.
The thicker myelinated sensory fibres lose their myelin, as they branch repeatedly within the spindle.
The axons terminate in close opposition to the sarcolemma of the enclosed muscle fibres.
The muscle fibres of the muscle spindle are thinner, richer in sarcoplasm and have more nuclei.
