column skull brain eye tonsil
In both the United States (U.S.) and Canada, considered as controlled Risk countries, SRMs are defined as: skull, brain, trigeminal ganglia (nerves attached to brain and close to the skull exterior), eyes, spinal cord, distal ileum (a part of the small intestine), and the dorsal root ganglia (nerves attached to the spinal cord and close to the vertebral column) of cattle aged 30 months or older. On January 12, 2004, the Food Safety and Inspection Service (FSIS) of the USDA published new rules banning such materials from the human food supply.
In countries classified as undetermined risk, the OIE code recommends SRM removal as follows: tonsils and intestines in cattle at all ages; brains, eyes, spinal cord, skull and vertebral column from animals over twelve months of age.
In the European Union (E.U.), SRMs are excluded by law from the human and animal food chain.