Motor Functions and Control of Movement

Motor Functions and Control of Movement - movements...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Motor Functions and Control of Movement All muscular contractions are controlled by motor signals generated (but not originate) in the spinal cord Closed loop system of voluntary muscle control and movement 1. Local feedback Local sensory signals directly cause a motor signal Low level of hierarchy Immediate influence on the movement 2. Central feedback Processing of somatic sensory information by brain to influence descending motor signals High level of hierarchy Delay in signal processing 3. Feedback by other modalities Use of afferent information from vision and other modalities to influence descending motor signals Provides most accurate control Delay in signal processing Open loop system of muscle control and movement Afferent inputs elicit a movement that cannot be controlled by the brain (examples include reflex-evoked
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: movements, withdrawal from noxious stimuli) Major neural structures involved in movement (7) • Cerebral cortex, basal ganglia, thalamus, cerebellum, brain stem, spinal cord, muscle • Signals from brain stem originate from a variety of nuclei, including many from the core of gray matter – reticular formation • Most of the descending cortical signals affect spinal cord indirectly though relays in brain stem, some travel all the way to the anterior horn cells in the spinal cord • Basal ganglia and cerebellum have prominent projections to thalamus and to premotor and motor areas of the cerebral cortex...
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