enter spinal cord via dorsal root from abdominopelvic viscera OR enter

Enter spinal cord via dorsal root from abdominopelvic

This preview shows page 6 - 10 out of 11 pages.

enter spinal cord via dorsal root (from abdominopelvic viscera) OR enter brainstem via CNs V, VII, IX, and X (from mouth, pharynx, larynx, thoracic viscera) Impulses arrive at the solitary nucleus Solitary nucleus relays impulses to reticular formation, cardiovascular, and respiratory centers, but not cerebral cortex… unconscious sensations Visceral Sensory Pathway destination
Image of page 6
5/21/19 7 Motor Pathways Visceral motor pathways: ANS Chapter 16 Somatic motor pathways – stimulate skeletal muscle via • reflexes planned actions Organization of Motor pathways begin: primary motor cortex end: skeletal muscles 2 neurons Upper motor neuron (UMN): soma located in CNS processing center Lower motor neuron (LMN): soma located in a nucleus of brain stem or ventral horn Three Motor pathways Corticospinal Medial Lateral FYI: Activity monitored & adjusted by basal nuclei – cerebellum
Image of page 7
5/21/19 8 Corticospinal pathway - also called pyramidal system Voluntary control over skeletal muscles pyramidal cells (UMNs) of the primary motor cortex synpase on LMNs Tracts form pyramids LMNs located in the brainstem or in ventral horn of spinal cord LMNs fibers extend to effectors Corticospinal pathway Contains three paired tracts Lateral corticospinal tracts Anterior corticospinal tracts Corticobulbar tracts Motor cortex precentral gyrus Differential representation of different muscles groups is evident motor homunculus muscles with high numbers of motor units: large area of cortex Muscle groups with the largest cortical area representation include those of the fingers/thumb, lips, tongue, vocal cords
Image of page 8
Image of page 9
Image of page 10

You've reached the end of your free preview.

Want to read all 11 pages?

  • Spring '18
  • Mark Bolke
  • Corticospinal tract, Visceral Sensory Pathways

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes