Muscle Spindle (Sensory Receptor)Nervous TissuePeripheral Nervous System Download ImageAll ChaptersBlood Cells5Cardiovascular System5Cells and Organelles2Connective Tissues3Digestive and Accessory Organs6Endocrine System3Epithelial Tissues4Immune System6Integumentary System1Muscle Tissues8Nervous Tissue10Reproductive Systems8Respiratory System4Skeletal and Articular Systems10Special Senses10Urinary System9