{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Somatic Motor Pathways - posture blocking unwanted...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Somatic Motor Pathways: Levels of Motor Control: - some lower-level motor control is mediated by reflex arcs, but complex motor activities appear to be regulated by fixed-action patterns (stereotyped sequential motor actions triggered internally or by environmental stimuli) - Segmental level: segmental circuits of spinal cord Segmental circuits activate anterior horn segments of the spinal cord to stimulate a specific group of muscle fibers Circuits controlling locomotion & common motor activity are called central pattern generators (CPGs) - Projection level: cortical motor areas that produce the direct (pyramidal) system & indirect (extrapyramidal or multineuronal) system . axons of the neurons at this level project to the spinal cord & help control both reflex & fixed-action pattern activities, and produce voluntary movement - Programs & Instructions Level: neurons in the basal nuclei of the cerebrum and of the cerebellum ( precommand areas ) that regulate motor activity Involved in starting & stopping movements, coordinating movements with
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: posture, blocking unwanted movements & maintaining muscle tone Cerebellum: center for sensorimotor integration & control, correcting errors in muscle activity, & fine-tuning motor activity o damage to the cerebellum results in disorders of synergy & muscle tone, disturbances of equilibrium & speech disorders Basal nuclei: receive inputs from all cortical areas & send output to the premotor & prefrontal cortex to coordinate more complex motor activities- Organization of Upper Motor Neuron Pathways: cortical motor areas that produce the direct (pyramidal) system & indirect (extrapyramidal or multineuronal) system Direct Motor Pathways o lateral corticospinal tracts: conveys nerve impulses from motor cortex to skeletal muscles on opposite side of the body for precise, voluntary movements of hands & limbs o anterior corticospinal tracts: conveys nerve impulses from motor cortex to skeletal muscles on opposite side of the body for movements of axial skeleton page4...
View Full Document

{[ snackBarMessage ]}

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