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Related Concept Videos

Brainstem: Control Centers of Medulla01:21

Brainstem: Control Centers of Medulla

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.
Olivary Nucleus
The olivary nucleus, or inferior olivary nucleus, is located within the ventrolateral part of the medulla oblongata. It is primarily involved in motor coordination and motor learning. The olivary nucleus receives input from the spinal cord, cerebellum, and motor...
Diencephalon: Hypothalamus and Coordination01:23

Diencephalon: Hypothalamus and Coordination

The hypothalamus is a small yet highly complex and essential brain region that plays a crucial role in regulating various bodily functions. Anatomically, it is located at the base of the brain, just above the brainstem and below the thalamus, forming part of the limbic system.
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Related Experiment Video

Updated: Jun 20, 2026

Injections of AAV Vectors for Optogenetics in Anesthetized and Awake Behaving Non-Human Primate Brain
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Orexin-A inputs onto visuomotor cell groups in the monkey brainstem.

S Schreyer1, J A Büttner-Ennever, X Tang

  • 1Institute of Anatomy, Ludwig-Maximilians University of Munich, Pettenkoferstrasse 11, D-80336 Munich, Germany.

Neuroscience
|August 26, 2009
PubMed
Summary

Orexin-A influences eye movements, eyelid position, and pupil reactions during sleep-wake transitions. This neuropeptide modulates specific oculomotor pathways, impacting eyelid and pupil control but not saccadic eye movements.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Sleep Science

Background:

  • Orexin-A, a neuropeptide from the lateral hypothalamus, is crucial for maintaining wakefulness.
  • Changes in visuomotor behaviors during sleep-wake transitions suggest a role for orexin-A in these processes.

Purpose of the Study:

  • To investigate orexin-A projections to visuomotor cell groups in the monkey brainstem.
  • To determine if direct orexinergic pathways modulate visuomotor behaviors during the sleep-wake cycle.

Main Methods:

  • Used histological markers to identify visuomotor cell groups in monkey brainstem sections.
  • Performed orexin-A immunostaining and quantitative analysis of orexin-A input.
  • Utilized dorsal raphe nucleus orexin-A input as a control standard.

Main Results:

  • Orexin-A input was minimal to motoneurons of singly-innervated extraocular muscles, omnipause neurons, and premotor saccadic neurons.
  • Strong orexin-A input was observed in motoneurons of multiply-innervated extraocular muscles, levator palpebrae muscle, and preganglionic ciliary ganglion neurons.
  • Orexin-A strongly innervated motoneurons controlling eyelid and pupil muscles.

Conclusions:

  • Orexin-A modulates pupil size and eyelid position via motoneurons of multiply-innervated muscle fibers.
  • Orexin-A influences convergence and eye alignment through these pathways.
  • Orexin-A does not directly modulate premotor pathways for saccades or singly-innervated extraocular muscle motoneurons.