Cranial Nerves Anatomy Tutorials

Region: Cranial Nerves

Hypoglossal Nerve

Hypoglossal Nerve The structure indicated is the hypoglossal nerve (cranial nerve XII). The hypoglossal nerve carries general somatic efferent nerve fibres and is responsible for motor innervation to the extrinsic and intrinsic muscles of the tongue. It arises from the hypoglossal nucleus located in the caudal brain stem and emerges from the preolivary sulcus in the ventromedial aspect of the medulla oblongata from several rootlets. The preolivary sulcus separates the olive from the medullary pyramids. The hypoglossal nerve then passes through the subarachnoid space and exits the skull through the hypoglossal canal. The extrinsic muscles of the tongue are as …

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Hypoglossal Nerve

Abducent Nerve

Abducent Nerve The structure indicated is the abducent nerve (cranial nerve VI). The abducent nerve (cranial nerve VI), provides general somatic efferent fibres (motor function) to the lateral rectus muscle of the eye. There are three cranial nerves which are responsible for innervating the extrinsic muscles of the eye: Oculomotor nerve (cranial nerve III) Trochlear nerve (cranial nerve VI) Abducent nerve The oculomotor nerve supplies the superior, inferior and medial rectus muscles, as well as the inferior oblique muscle and the levator palpebrae superioris. The trochlear nerve supplies the superior oblique muscle. It originates between the pons and the medulla …

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Abducent nerve