<P> The patellar reflex or knee - jerk (myotatic) (monosynaptic) (American spelling knee reflex) is a stretch reflex which tests the L2, L3, and L4 segments of the spinal cord . </P> <Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (April 2016) (Learn how and when to remove this template message) </Td> </Tr> </Table>

The patellar knee jerk reflex is an example of