| A constant low level of tonic contraction also characterizes the parapharyngeal musculature, the striated muscles that share their innervation with the pharynx. |
| The toxin inhibits the release of acetylcholine at the neuromuscular junction and affects the postganglionic sympathetic innervation of the sweat glands. |
| In contrast to the innervation of the proximal esophagus, axons from vagal neurons synapse within ganglia of the myenteric plexus. |
| The detrusor, levator ani, and external sphincter muscles share the sacral nerves as a common innervation source. |
| Respiratory depression is caused by blockade of the innervation of the respiratory muscles, including the diaphragm. |
| During expiration, the rectus abdominous muscle receives motor innervation from both the thoracoabdominal intercostal and subcostal nerves. |
