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Related Concept Videos

Brainstem: Control Centers of Medulla01:21

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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 brainstem, located inferior to the brain and superior to the spinal cord, serves as a bridge between the cerebrum and the spinal cord. It plays a vital role in relaying information and controlling critical life functions. It comprises three primary regions: the midbrain, pons, and medulla oblongata.
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The reticular formation is a complex network of gray and white matter located within the brainstem extending from the medulla to the midbrain.
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The brain is the most complex organ in the human body. It consists of four main parts: the cerebrum, diencephalon, cerebellum, and brainstem.
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The neural regulation of respiration is a meticulously coordinated process primarily controlled by the respiratory centers located within the brainstem. These centers, composed of specialized neurons, transmit nerve impulses that control the contraction and relaxation of our respiratory muscles.
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The cranial nerves are an important part of the complex network of nerves in the human body. These nerves emerge directly from the brain and are responsible for transmitting essential information between the brain and various parts of the head and neck. There are 12 pairs of cranial nerves, systematically numbered using Roman numerals from I to XII, beginning from the anterior and moving to the posterior of the brain. Each cranial nerve is uniquely identified by names that reflect its function...
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Updated: May 27, 2025

Preparation of Rhythmically-active In Vitro Neonatal Rodent Brainstem-spinal Cord and Thin Slice
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A brainstem map of orofacial rhythms.

Heet Kaku1, Liu D Liu2,3, Runbo Gao1

  • 1Department of Neurobiology, Duke University, Durham NC.

Biorxiv : the Preprint Server for Biology
|February 20, 2025
PubMed
Summary
This summary is machine-generated.

Brainstem circuits coordinate rhythmic orofacial movements like licking with breathing. Researchers identified a neural network in the intermediate nucleus of the reticular formation (IRN) that acts as a central pattern generator for licking.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Computational Neuroscience

Background:

  • Rhythmic orofacial behaviors (eating, drinking, vocalization) are controlled by brainstem premotor networks.
  • Coordination between orofacial movements and breathing is crucial for preventing aspiration and due to shared musculature.
  • Understanding the neural mechanisms of rhythmic motor program coordination requires in vivo neurophysiological studies.

Purpose of the Study:

  • To investigate the neural circuits in the brainstem that coordinate rhythmic orofacial movements with breathing.
  • To identify the premotor networks responsible for generating rhythmic licking behavior.
  • To elucidate the interaction dynamics between coupled brainstem oscillators during behavior.

Main Methods:

  • Utilized Neuropixels probe recordings in behaving mice to map neural activity.
  • Recorded brainstem neural activity correlated with breathing, licking, and swallowing.
  • Employed local optogenetic stimulation to perturb neural activity in the intermediate nucleus of the reticular formation (IRN).

Main Results:

  • Breathing and licking rhythms were found to be tightly coordinated and phase-locked.
  • Intermittent swallowing events caused temporary pauses in both breathing and licking.
  • Identified distinct neuronal clusters within the IRN associated with different orofacial rhythms, forming a lingual premotor network.
  • Optogenetic stimulation in a specific IRN region induced sustained rhythmic licking, suggesting a central pattern generator.
  • Demonstrated that coupled brainstem oscillators autonomously coordinate licking and breathing, with descending inputs further patterning the rhythm at licking initiation.

Conclusions:

  • The intermediate nucleus of the reticular formation (IRN) contains a central pattern generator for licking.
  • Brainstem oscillators autonomously coordinate licking and breathing rhythms.
  • Descending inputs modulate these coupled oscillators during licking initiation.
  • The findings reveal the circuit logic and neural dynamics governing the interaction of orofacial rhythms, offering a model for studying multi-oscillator systems.