Front: Spinal cord
Back: Nervous system
Front: Brain
Back: Nervous system
Front: Thyroid gland
Back: Endocrine system
Front: Larynx
Back: Respiratory system
Front: Trachea
Back: Respiratory system
Front: Gonad (testis/ovary)
Back: Reproductive / Endocrine system
Front: Lymph vessel and lymph node
Back: Lymphatic system
Front: Pituitary gland
Back: Endocrine system
Front: Vertebrae
Back: Skeletal system
Front: Lung
Back: Respiratory system
Front: Heart
Back: Cardiovascular system
Front: Artery, vein
Back: Cardiovascular system
Front: Large intestine
Back: Digestive system
Front: Small intestine
Back: Digestive system
Front: Stomach
Back: Digestive system
Front: Gall bladder
Back: Digestive system
Front: Liver
Back: Digestive system
Front: Adrenal gland
Back: Endocrine system
Front: Kidney
Back: Urinary system
Front: Urethra
Back: Urinary system, reproductive system (in males)
Front: Ureter
Back: Urinary system
Front: Uterus
Back: Reproductive system
Front: Diaphragm
Back: Respiratory system
Front: Urinary bladder
Back: Urinary system
Front: Salivary gland
Back: Digestive system
Front: Esophagus
Back: Digestive system
Front: Rib
Back: Skeletal system
Front: Spleen
Back: Lymphatic system
Front: Pancreas
Back: Endocrine system, Digestive system