1 / 21

Trigeminal System

Trigeminal System. Useful animations:. https://www1.columbia.edu/sec/itc/hs/medical/neruoanatomy/neuroanat/. Somatic sensory: A007. Sensory cranial: F003. Sensory cranial: F004. Somatic sensory: AN01. Somatic sensory: A006. Readings: Principles of NS

lucas
Download Presentation

Trigeminal System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Trigeminal System

  2. Useful animations: https://www1.columbia.edu/sec/itc/hs/medical/neruoanatomy/neuroanat/ Somatic sensory: A007 Sensory cranial: F003 Sensory cranial: F004 Somatic sensory: AN01 Somatic sensory: A006 Readings: Principles of NS General somatic sensory organization: 447-449 Brain stem/cranial nerve review: 873-880 Sensory nuclei : 880-882, Fig 44-6

  3. Nociceptors, thermoreceptors, & itch receptors are bare nerve endings Mechanoreceptors are encapsulated Bare nerve ending Merkel’s receptor Meissner’s corpuscle Pacinian corpuscle

  4. Dorsal horn Anterolateral system: spino-thal spino-retic spino-mesen

  5. Components of the trigeminal system • Spinal nucleus • Caudal nucleus Pain/temp/itch • Interpolar nucleus Pain/reflexes, etc, ??? • Oral nucleus Reflexes, etc, ??? • Main sensory nucleus Mechanosensation • Mesencephalic nucleus Jaw proprioception • Motor nucleus Jaw muscles

  6. Mesencephalic Trigeminal motor Main sensory Spinal trigeminal nuc: oral interpolar caudal

  7. Organization of the spinal trigeminal nucleus: caudal nucleus

  8. Ophthalmic division Maxillary division Mandibular division 7, 9, & 10 3 C2 2 1 C2 Interpolar nucleus 3 Caudal nucleus 2 1 C2 Upper spinal cord

  9. Input: Small-diameter fibers Marginal zone Substantia gelatinosa Spinal trigeminal tract Caudal nucleus Output: Marginal zone-->Thalamus, midbrain Substantia gelatinosa-->interneurons

  10. Spinal trigeminal tract Caudal nucleus Anterolateral system

  11. Trigeminal lemniscus Medial lemniscus Main sensory Anterolateral/ trigeminothal Trigeminal motor Medial/trigeminal lemniscus

  12. Mesencephalic Nucleus &tract

  13. Mesencephalic Nucleus &tract

  14. Somatic Sensory Thalamus Medial dorsal Ventral posterior medial-VPM (trigem) Ventral posterior lateral-VPL (spinal) Touch Pain Ventral posterior (VMpo)

  15. Anterolateral and Trigeminal Systems Ventral posterior-->Postcentral gyrus •localization

  16. Anterolateral System Ventral medialpost-->Insular •behavioral & •autonomic responses •“Limbic” Amygdala

  17. Anterolateral and Trigeminal Systems Medial dorsal-->Cingulate gyrus •emotional (-valence…) •“Limbic”

  18. - Pain suppression path Limbic cortex Periaqueductalgray matter Raphe nuclei(5-HT) Caudal nucleus

  19. Trigeminal System • Separate components for pain and touch • Brain stem nuclei: • Caudal nucleus (pain) • Interpolar nucleus (caudal part for pain-mouth) • Oral nucleus (???) • Main sensory nucleus • 3 Separate thalamic pain nuclei & 1 for touch: • Pain (VPM, VMpo, MD) • Touch (VPM) • 3 Separate cortical representations: • Postcentral gyrus (localization) • Insular (important for pain) • Cingulate (emotions, esp. for pain) • Pain suppression system • PAG-->Raphe nuclei (5-HT)-->Caudal nucleus

More Related