2024年5月20日 · The hypoglossal nerve is purely motor nerve, which innervates extrinsic tongue muscles and geniohyoid muscle. It originates from it motor nucleus found in the ventral medulla oblongata. This article will discuss the anatomy and function of the hypoglossal nerve.

The hypoglossal nucleus is a cranial nerve nucleus, found within the medulla. Being a motor nucleus, it is close to the midline. In the open medulla, it is visible as what is known as the hypoglossal trigone, a raised area (medial to the vagal …

2022年11月7日 · The hypoglossal nerve can be damaged at the hypoglossal nucleus (nuclear), above the hypoglossal nucleus (supranuclear), or interrupted at the motor axons (infranuclear). Such damage causes paralysis, fasciculations (as noted by a scalloped appearance of the tongue), and eventual atrophy of the tongue muscles.

The hypoglossal nerve, also known as the twelfth cranial nerve, cranial nerve XII, or simply CN XII, is a cranial nerve that innervates all the extrinsic and intrinsic muscles of the tongue except for the palatoglossus, which is innervated by the vagus nerve.

2024年11月2日 · The hypoglossal nerve arises from the hypoglossal nucleus in the medulla oblongata of the brainstem. It then passes laterally across the posterior cranial fossa, within the subarachnoid space. The nerve exits the cranium via the hypoglossal canal of the occipital bone.

Hypoglossal Nerve. The hypoglossal nucleus is on the floor of the fourth ventricle and contains the motor neurons that innervate the tongue. The nucleus is elongated, and multiple rootlets exit along a line between the pyramid and olive of the medulla. The rootlets converge to form the hypoglossal nerve, which exits the skull via the ...

The hypoglossal nucleus is a prominent cluster of large motor neurons that supply the muscles of the tongue. It extends from the caudal pole of the fourth ventricle to the pyramidal decussation.

2022年3月28日 · The hypoglossal nuclei, exist as paired nuclei within the medulla oblongata that provide motor innervation to the intrinsic and extrinsic muscles of the tongue (excluding palatoglossus) via the hypoglossal nerve. Gross Anatomy. The hypoglossal nuclei are located within the tegmentum of upper medulla close to the midline, lying deep to the ...

Hypoglossal Nucleus: The hypoglossal nucleus–the origin of the nerve–is found in the medulla oblongata within the brainstem. It is located near the midline beneath the floor of the fourth ventricle. The hypoglossal nucleus receives corticonuclear fibers (upper motor neurons) from both cerebral hemispheres.

The nucleus of hypoglossal nerve consists of neuronal cell bodies situated near the midline beneath the fourth ventricle floor's lower part. It functions as a general somatic efferent nucleus, crucial for innervating tongue muscles, thus controlling its movement and shape.