Accessory nucleus

Accessory Nucleus

The accessory nucleus is a component of the nervous system that plays a crucial role in the functioning of the human body. It is a part of the medulla oblongata, which is located in the brainstem. The accessory nucleus is associated with the accessory nerve, also known as the eleventh cranial nerve.

Function

The accessory nucleus is responsible for providing motor innervation to the sternocleidomastoid and trapezius muscles, which are involved in movements of the neck and shoulders. It also contributes to the functioning of the larynx, pharynx, and soft palate.

Anatomy

The accessory nucleus is located in the anterior part of the medulla oblongata, extending from the level of the mid-pons to the upper cervical spinal cord. It is composed of a series of neurons that give rise to the accessory nerve.

Clinical Significance

Damage to the accessory nucleus can result in a condition known as accessory nerve palsy, which is characterized by weakness or paralysis of the sternocleidomastoid and trapezius muscles. This can lead to difficulties in moving the neck and shoulders, and may also affect speech and swallowing.

See Also

• Medulla oblongata
• Accessory nerve
• Cranial nerves
• Nervous system