The branches of the cervical plexus innervate the muscles of the:

The brachial plexus innervates the:

When a sensory neuron synapses directly on a motor neuron, which itself serves as the processing center, the reflex is called a (an):

The sensory receptors in the stretch reflex are the:

All polysynaptic reflexes share the same basic characteristics(s), which include:

As descending inhibitory synapses develop:

The highest level of motor control involves a series of interactions that occur:

The somatic nervous system issues somatic motor commands that direct the:

The autonomic nervous system issues motor commands that control:

Proprioceptive data from peripheral structures, visual information from the eyes, and equilibrium-related sensations are processed and integrated in the:

The integrative activities performed by neurons in the cerebellar cortex and cerebellar nuclei are essential to the:

The autonomic nervous system is a subdivision of the:

The lower motor neurons of the somatic nervous system (SNS) exert direct control over skeletal muscles. By contrast, in the ANS there is:

Sympathetic (preganglionic) neurons originate between:

The important function(s) of the postganglionic fibers that enter the thoracic cavity in autonomic nerves include:

Preganglionic neurons in the parasympathetic division of the ANS originate in the:

Since second-order neurons in the parasympathetic division are all located in the same ganglion, the effects of parasympathetic stimulation are:

The parasympathetic division of the ANS includes visceral motor nuclei associated with cranial nerves:

At their synapses with ganglionic neurons, all ganglionic neurons in the sympathetic division release:

At neuroeffector junctions, typical sympathetic postganglionic fibers release: