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# Nervous System Structures The document describes the structures and functions of several cranial nerves, specifically their innervation pathways. ## Cranial Nerve X (Vagus Nerve) * **Sensory Fibers:** Collect gustatory information from the base of the tongue, epiglottis, and pharynx. Also, coll...

# Nervous System Structures The document describes the structures and functions of several cranial nerves, specifically their innervation pathways. ## Cranial Nerve X (Vagus Nerve) * **Sensory Fibers:** Collect gustatory information from the base of the tongue, epiglottis, and pharynx. Also, collect visceral sensory information from internal organs. * **Motor Fibers:** Innervate muscles of the pharynx and larynx. * **Parasympathetic (PS) Fibers:** Innervate most thoracic and abdominal organs; they pass laterally to the carotid artery and anterior/posterior to the arch of the aorta, the stomach, small intestine, and colon. ## Cranial Nerve XI (Accessory Nerve) * **Motor Fibers:** Two roots: bulbar and spinal. * **Bulbar Root:** Innervates larynx muscles, originates from the nucleus ambiguus in the medulla oblongata. * **Spinal Root:** Innervates sternocleidomastoid and trapezius muscles, originates from the upper cervical spinal cord. ## Cranial Nerve XII (Hypoglossal Nerve) * **Motor Fibers:** Innervate muscles of the tongue, originating from the hypoglossal nucleus in the medulla oblongata. **Important Note:** The document contains anatomical descriptions and diagrams and lists, but there are no tables or mathematical formulas. The information about the nerves includes their functions (sensory, motor, and parasympathetic). There is also a mention of locations (e.g., position relative to other nerves or structures).