Question

Assertion (A) : All spinal nerves are mixed nerves.
Reason (R) : Each spinal nerve has a sensory root and a motor root.
i) Both ‘A’ and ‘R’ are true and ‘R’ explains ‘A’.
ii) Both ‘A’ and ‘R’ are true but ‘R’ doesn’t explain ‘A’.
iii) Only ‘A’ is true but ‘R’ is false.
iv) ‘A’ is false but ‘R’ is true

Answer 1

A is false but R is true.

All spinal nerves are classified as mixed nerves as their posterior roots contain sensory axons and their anterior root contains motor axons.

Their motor fibres begin on the ventral part of the spinal cord and the roots of sensory fibres can be found on the dorsal side of the spinal cord.

Sensory neurons carry signals from outer parts into the CNS whereas motor neurons carry signals from CNS to outer parts.