ANAT 321 Lecture Notes - Lecture 7: Trapezius Muscle, Cranial Nerve Nucleus, Periaqueductal Gray

• School: McGill University
• Department: Anatomy & Cell Biology
• Course: ANAT 321
• Professor: David Ragsdale

Document Summary

Brainstem functions can be divided into the three general categories: conduit functions, cranial nerve functions; The fasciculi gracilis and cuneatus are part of the dorsal column-medial lemniscus tract; the spinothalamic tract is part of the anterolateral tract (pain and temperature) The fasciculi turn into nuclei as the tracts ascend up the brainstem: at the medial lemniscus, the tracts correspond to the opposite side of the body - this is also where you can see the 4th ventricle. In the pons, the medial lemniscus starts moving up. Cranial nerves: nerves that mainly come out of the brainstem (mostly, not all) They are in charge of innervated the head/neck/face areas. Trigeminal - mainly motor, cutaneous and proproceptive sensation in face and mouth; innervation of teeth; muscles of mastication: responsible for sensory function in the head, abducens - motor nerve, eye movements. Spinal accessory - motor ; trapezius and sternocleidomastoid muscles (back and neck: hypoglossal nerve - motor - muscles of the tongue.