8.2 Brain Mechanisms of Movement Flashcards Preview

Behavioral Neuroscience > 8.2 Brain Mechanisms of Movement > Flashcards

Flashcards in 8.2 Brain Mechanisms of Movement Deck (18):
1

Primary motor cortex

The precentral gyrus of the frontal cortex, just anterior to the central sulcus; can elicit movements

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Posterior parietal cortex

Some neurons respond primarily to visual or somatosensory stimuli, Somers fun mostly to current or future movements, and some respond to complicating make sure of the stimulus and the upcoming response; Keeps track of the position of the body relative to the world

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Prefrontal cortex

Responds mostly to the sensory signals that lead to movement

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Premotor cortex

Most active during preparations for a movement and less active during the movement itself; response to sensory stimuli, especially to visual stimuli from objects near the hands for the face

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Supplementary motor cortex

Most active during preparations for a rapid series of movements

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Dorsolateral tract

The part of the spinal cord that has a set of axons from the primary motor cortex and surrounding areas and from the red nucleus of the midbrain

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Pyramids

The bulges of the medulla; where the dorsolateral tract crosses from one side of the brain it's the opposite side of the spinal cord

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Ventromedial tract

Includes many axons from the primary motor cortex and supplementary motor cortex and also some from many other parts of the cortex; also includes axons that originate from the midbrain tectum, the reticular formation, and the vestibular nucleus; Controls mainly the muscles of the neck, shoulders, and trunk; these movements are necessarily bilateral

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Vestibular nucleus

The brain area receiving input from the vestibular system

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Cerebellum

Important for motor control, including learned motor sponsors; contains more neurons than the rest of the brain combined

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Saccades

Ballistic I movements from one fixation point to another

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Cerebellar cortex

The surface of the cerebellum

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Purkinje cells

Very flat cells and sequential planes; found in the cerebellar cortex

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Parallel fibers

Axons parallel to one another but perpendicular to the planes of the Purkinje cells

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Nuclei of the cerebellum

Clusters of cell bodies in the interior of the cerebellum

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Basal ganglia

Applies collectively to a group of large subcortical structures in the forebrain; Includes the caudate nucleus, the putamen, and the globus pallidus; Important for habit learning; active in selecting which response to make or inhibit

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Caudate nucleus and putamen

Receptive areas; receiving input from sensory areas of the thalamus and the cerebral cortex

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Globus pallidus

The output area; sends information to the thalamus, which in turn sends it to the motor cortex and the prefrontal cortex