2-Minute Neuroscience: The Brainstem

Subjects: Neurosciences
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Neuroscientifically Challenged

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Release Date: 2024-05-13

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brain
brainstem
neurons
CNS

Video Introduction

The brainstem is a stalk that leaves the base of the brain and connects the brain to the spinal cord. It contains many important pathways that run between the brain and spinal cord as well as pathways to other areas like the cerebellum. It also contains a large number of important nuclei, and is essential to both survival and proper cognitive functioning. It consists of three major divisions: the medulla oblongata, pons, and midbrain.

The medulla oblongata, often simply called the medulla, is the point where the brainstem connects to the spinal cord. The medulla is essential for survival as it contains nuclei that ensure vital systems like the cardiovascular and respiratory systems are working properly. The medulla also contains nuclei that are responsible for a number of reflexive actions, including vomiting, swallowing, coughing, and sneezing. Several cranial nerves also exit the brainstem at the level of the medulla.

The next structure on our way up the brainstem is the pons. The word "pons" means bridge in Latin, and the pons is a large, rounded structure resembling a rounded bridge that connects the medulla and the midbrain. The pons is home to a number of nuclei for cranial nerves and contains nuclei that deal with sensations from the head and face, motor movement of the eyes, face, and mouth, hearing, equilibrium, and autonomic functions like tear and saliva production.

The final branch of the brainstem as we move toward the cerebrum is called the midbrain. On the posterior side of the midbrain we find four bumps representing two paired structures: the superior and inferior colliculi. The superior colliculi are involved in eye movements and visual processing, while the inferior colliculi are involved in auditory processing. The midbrain also contains the major dopamine-producing nuclei of the brain: the ventral tegmental area and substantia nigra. Among other functions, the ventral tegmental area is involved in motivation and reward while the substantia nigra plays an important role in movement. ^[1]

References

Nolte J. The Human Brain: An Introduction to its Functional Anatomy. 6th ed. Philadelphia, PA. Elsevier; 2009.

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Description: The brainstem is a stalk that leaves the base of the brain and connects the brain to the spinal cord

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Challenged, N. 2-Minute Neuroscience: The Brainstem. Encyclopedia. Available online: https://encyclopedia.pub/video/video_detail/1241 (accessed on 21 December 2024).

Challenged N. 2-Minute Neuroscience: The Brainstem. Encyclopedia. Available at: https://encyclopedia.pub/video/video_detail/1241. Accessed December 21, 2024.

Challenged, Neuroscientifically. "2-Minute Neuroscience: The Brainstem" Encyclopedia, https://encyclopedia.pub/video/video_detail/1241 (accessed December 21, 2024).

Challenged, N. (2024, May 13). 2-Minute Neuroscience: The Brainstem. In Encyclopedia. https://encyclopedia.pub/video/video_detail/1241

Challenged, Neuroscientifically. "2-Minute Neuroscience: The Brainstem." Encyclopedia. Web. 13 May, 2024.