Dense regular arranged in an irregular pattern

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Unformatted text preview: tendon receptors through two neurons to the cerebellum First order is unipolar sensory neuron, and it synapses with the second order neuron in the spinal gray matter, which travels in spinocerebellar tract to cerebellum. They either don’t cross or crisscross as long as the information ends up on the same side of cerebellum as the stimulus. First order unipolar sensory neuron synapses with second order neuron in the spinal gray matter, which crosses over to other side of cord and travels up the spinothalamic tract to the thalamus. The secondary neuron then synapses with the third order neuron that travels to the cerebral cortex where the conscious senses are perceived. The first order unipolar neurons proceed uncrossed to medulla oblongata and synapse with second order neurons, which travel to the thalamus where they synapse with third order neurons, which carry received signals to the cerebral cortex where the sensory signals are interpreted. The lateral bundle fibers cross to the other side of the cord in an area of the medulla known as the pyramids, and the anterior bundle fibers remain on the same side of the cord until they reach the lower motor neurons. The upper motor neurons are primary neurons; the lower motor neurons are secondary neurons. Name of Tract Spinothalamic Tract (Sensory) Senses pain, temperature, touch, and pressure from pacinian and meissner’s corpuscles throughout the body. Information travels from the spinal cord to the thalamus. Fasciculus Cuneatus and Fasciculus Gracilis (sensory) Transmit fine touch and conscious proprioception from spinal nerves located in C1 through T6 and T7 through L5 to the cerebral cortex. Corticospinal Tracts (motor) Carries voluntary motor stimuli from the pre-central gyrus to motor neurons in the ventral horn of the gray matter of spinal cord. Walking Right Knee Extended going to Flexed 1. Contraction of rectus femoris (quadriceps) stretches tendon. 2. Tendon stretch causes Golgi tendon organ to send message to spinal cord, which in turn: a. Inhibits contraction of rectus femoris b. Activates contraction of biceps femoris (hamstrings) 3. Contraction of biceps femoris causes right knee to flex Right Knee Flexed going to Extended 4. Extension of rectus femoris causes muscle to stretch. 5. Stretched muscle activates muscle spindle to send message to spinal cord, which in turn: a. Inhibits contraction of biceps femoris b. Activates contraction of rectus femoris 6. Contraction of rectus femoris causes right knee to extend. Repeat for walking! Brain Assignment C E B A F G H I D J NAME OF AREA Visual areas FUNCTION OF AREA Areas receive visual stimuli, process the images from the two eyes into a single 3-dimensional image, and interpret it. Parietal lobe Integrates sensory information from different modalities, particularly determining spatial sense and navigation Primary somatosensory area Primary motor area Responsible for conscious sensations from musculocutaneous regions of the body: pain, temperature, touch, and pressure Receiv...
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This note was uploaded on 01/29/2013 for the course BIOL 239 taught by Professor Swan during the Fall '12 term at New Mexico.

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