Posterolateral sulcus of medulla oblongata

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Posterolateral Sulcus of Medulla Oblongata

The Posterolateral Sulcus of Medulla Oblongata is a significant anatomical feature of the Medulla Oblongata, a part of the Brainstem. It is a groove that runs along the posterior and lateral aspects of the medulla oblongata, marking the area where the Cranial Nerves emerge.

Anatomy[edit | edit source]

The posterolateral sulcus is located on the dorsal surface of the medulla oblongata, adjacent to the Posterior Median Sulcus. It extends from the Foramen Magnum to the lower border of the Pons, and is the exit point for the glossopharyngeal, vagus, and accessory nerves.

File:Gray's Anatomy plate 691.png
Posterolateral sulcus of medulla oblongata as seen in Gray's Anatomy

Cranial Nerves[edit | edit source]

The Glossopharyngeal Nerve (IX), Vagus Nerve (X), and Accessory Nerve (XI) emerge from the posterolateral sulcus. These nerves are involved in various functions including swallowing, speech, and shoulder movements.

Function[edit | edit source]

The posterolateral sulcus serves as a pathway for the aforementioned cranial nerves. It plays a crucial role in transmitting signals between the brain and the body, particularly in relation to the functions controlled by the glossopharyngeal, vagus, and accessory nerves.

Clinical Significance[edit | edit source]

Damage or disease affecting the posterolateral sulcus can lead to a range of neurological disorders, including Dysphagia (difficulty swallowing), Dysphonia (voice disorders), and Shoulder Drop (weakness of the trapezius muscle).

See Also[edit | edit source]

References[edit | edit source]


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Contributors: Prab R. Tumpati, MD