Question

which of the following statements about the spinal cord is false? multiple choice the cell bodies of motor neurons are located only in the spinal cord. descending motor axons that originate in the primary motor cortex synapse directly onto motor efferents. spinal interneurons can synapse onto motor neurons. motor efferents exit the spinal cord at the ventral root. sensory afferents projecting to the spinal cord have their cell bodies in the dorsal root ganglia.

Answer 1

The false statement is that descending motor axons directly synapse onto motor efferents. They actually synapse on interneurons or lower motor neurons in the spinal cord.

Step-by-step explanation:

The false statement about the spinal cord is: 'Descending motor axons that originate in the primary motor cortex synapse directly onto motor efferents.' This is incorrect because the descending motor axons from the primary motor cortex typically synapse onto interneurons or lower motor neurons in the spinal cord, rather than directly onto motor efferents.

The cell bodies of motor neurons are located in the ventral horn of the spinal cord and project to muscle through the ventral root. Spinal interneurons can indeed synapse onto motor neurons facilitating communication within the spinal cord. Motor efferents exit the spinal cord at the ventral root, and sensory afferents projecting to the spinal cord have their cell bodies located in the dorsal root ganglia. Thus, these statements are true.