8.2 Brain Mechanisms of Movement Flashcards Preview

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Flashcards in 8.2 Brain Mechanisms of Movement Deck (18)
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Primary motor cortex

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


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


Prefrontal cortex

Responds mostly to the sensory signals that lead to movement


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


Supplementary motor cortex

Most active during preparations for a rapid series of movements


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



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


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


Vestibular nucleus

The brain area receiving input from the vestibular system



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



Ballistic I movements from one fixation point to another


Cerebellar cortex

The surface of the cerebellum


Purkinje cells

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


Parallel fibers

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


Nuclei of the cerebellum

Clusters of cell bodies in the interior of the cerebellum


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


Caudate nucleus and putamen

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


Globus pallidus

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