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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
(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
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
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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.
- Fall '12