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Related Concept Videos

Neural Regulation01:37

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Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.
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The medulla oblongata is a crucial part of the brainstem responsible for controlling various autonomic and involuntary functions. It contains several nuclei, including the olivary, cuneate, gracile, and solitary nuclei.
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The process of digestion is composed of three stages – cephalic, gastric, and intestinal – each with a distinct control center. The cephalic phase is the first stage, and it starts even before the food enters the stomach. It is controlled by the central nervous system and is initiated by any food-related sensory stimuli, such as the sight and smell of food, which send signals to the brain. While eating, the taste receptors intensify these signals, which travel to the cerebral cortex...
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Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the...
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The diencephalon, etymologically translated as 'through brain,' plays an integral role as the conduit between the cerebrum and the vast extent of the nervous system. However, the olfactory system is an exception, as it interfaces directly with the cerebrum. The diencephalon, deeply ensconced beneath the cerebrum, primarily consists of three paired structures — the thalamus, hypothalamus, and epithelamus. It also includes accessory structures such as the subthalamus, which houses the...
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Related Experiment Video

Updated: Jan 18, 2026

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Cellular coding of ingestion in the caudal brainstem.

Truong Ly1,2,3,4,5, Xinyang Yi1,2,3,5, Grace R Lee6

  • 1Department of Physiology, University of California, San Francisco, San Francisco, CA, USA.

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Summary

The brainstem rapidly controls eating using mouth signals, not just gut signals. Pregastric feedback from the mouth and throat influences meal termination, revealing new insights into food intake regulation.

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Area of Science:

  • Neuroscience
  • Gastroenterology
  • Behavioral Science

Background:

  • The caudal nucleus of the solitary tract (cNTS) in the brainstem receives signals from the gut via vagal sensory neurons.
  • These signals are thought to be crucial for triggering meal termination.
  • How the cNTS represents food intake and controls behavior remains largely unknown.

Purpose of the Study:

  • To investigate how food ingestion is encoded in the cNTS of behaving animals.
  • To characterize the neural representations of different modes of food intake (oral vs. gastric).
  • To identify the pathways and signals involved in rapid control of food consumption.

Main Methods:

  • Single-cell imaging in the cNTS of behaving animals.
  • Delivery of food directly to the stomach versus oral consumption.
  • Investigating the role of gut-brain pathways and pregastric signals.
  • Examining descending projections from the paraventricular hypothalamus.

Main Results:

  • Gastric food delivery caused slow, ramping activation of cNTS neurons dependent on gut-brain pathways.
  • Oral food consumption elicited rapid, phasic responses in cNTS neurons, time-locked to oral contact or predictive cues.
  • These rapid responses were driven by mechanical, gustatory, and nutritive signals from the mouth and throat, independent of canonical gut-brain pathways.
  • Descending projections from the paraventricular hypothalamus tracked ingestion dynamics and were essential for meal termination.

Conclusions:

  • The caudal brainstem extensively utilizes pregastric signals for rapid control of food consumption.
  • Rapid, mouth-based feedback plays a significant role in meal termination, distinct from slower gut-based signals.
  • Understanding these pregastric signals offers new avenues for addressing eating disorders and obesity.