Innervation of the small intestine

The video tutorial explores the anatomy and innervation of the small intestine, focusing on its extrinsic and intrinsic nervous systems. It covers the roles of the sympathetic and parasympathetic nervous systems in digestion, as well as the enteric nervous system's ability to function independently. The tutorial also discusses clinical applications like celiac plexus block for pain management.

What percentage of digestion occurs in the small intestine?

• 90%

• 70%

• 50%

• 100%

Which part of the nervous system is responsible for controlling involuntary bodily functions?

• Central nervous system

• Peripheral nervous system

• Autonomic nervous system

• Somatic nervous system

What is the effect of sympathetic stimulation on digestion?

• Decreases digestion

• Increases digestion

• Varies with conditions

• No effect

Which nerves are involved in the sympathetic innervation of the small intestine?

• Vagus nerves

• Greater splanchnic nerves

• Phrenic nerves

• Hypoglossal nerves

What is the primary role of the parasympathetic nervous system in the small intestine?

• Inhibit digestion

• Control heart rate

• Regulate blood pressure

• Stimulate digestion

Which nerve provides parasympathetic innervation to the small intestine?

• Sciatic nerve

• Vagus nerve

• Trigeminal nerve

• Facial nerve

What is the enteric nervous system often referred to as?

• The big brain

• The little brain

• The peripheral brain

• The central brain

Which plexus is found between the circular and longitudinal layers of the gut muscle?

• Submucosal plexus

• Myenteric plexus

• Celiac plexus

• Renal plexus

What is the function of the submucosal plexus?

• Control heart rate

• Coordinate muscle contractions

• Regulate blood pressure

• Manage local intestinal conditions

How does the enteric nervous system operate in relation to the central nervous system?

• Is part of the CNS

• Depends entirely on the CNS

• Operates independently

• Requires constant CNS input