e primary motor area Multiple Choice contains more motor neurons for the thighs than the mouth. contains neurons that control smooth muscle. contains a smaller area for control of the hands than for control of the legs. contains a larger area for control of the hand and fingers than for control of the contains sensory neurons for the face in its inferior portion.

e primary motor area Multiple Choice contains more motor neurons for the thighs than the mouth. contains neurons that control smooth muscle. contains a smaller area for control of the hands than for control of the legs. contains a larger area for control of the hand and fingers than for control of the contains sensory neurons for the face in its inferior portion.

Anatomy & Physiology

1st Edition

ISBN:9781938168130

Author:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Publisher:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Chapter13: Anatomy Of The Nervous System

Section: Chapter Questions

Problem 1ILQ: Watch this animation (http://openstaxcollege.org/l/braindevel) to examine the development of the...

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Watch this video (http://openstaxcollege.org/l/3Dmovies) to learn about the side effects of 3-D movies. As discussed in this video, movies that are shot in 3-D can cause motion sickness, which elicits the autonomic symptoms of nausea and sweating. The disconnection between the perceived motion on the screen and the lack of any change in equilibrium stimulates these symptoms. Why do you think sitting close to the screen or right in the middle of the theater makes motion sickness during a 3-D movie worse?
Watch this video (http://openstaxcollege.org/l/reflextest) to see how to test reflexes in the abdomen. Testing reflexes of the trunk is not commonly performed in the neurological exam, but if findings suggest a problem with the thoracic segments of the spinal cord, a series of superficial reflexes of the abdomen can localize function to those segments. If contraction is not observed when the skin lateral to the umbilicus (belly button) is stimulated, what level of the spinal cord may be damaged?
Watch this animation (http://openstaxcollege.org/l/braindevel) to examine the development of the brain, starting with the neural tube. As the anterior end of the neural tube develops, it enlarges into the primary vesicles that establish the forebrain, midbrain, and hindbrain. Those structures continue to develop throughout the rest of embryonic development and into adolescence. They are the basis of the structure of the fully developed adult brain. How would you describe the difference in the relative sizes of the three regions of the brain when comparing the early (25th embryonic day) brain and the adult brain?
Watch this short video (http://openstaxcollege.org/l/stationtest) to see a test for station. Station refers to the position a person adopts when they are standing still. The examiner would look for issues with balance, which coordinates proprioceptive, vestibular, and visual information in the cerebellum. To test the ability of a subject to maintain balance, asking them to stand or hop on one foot can be more demanding. The examiner may also push the subject to see if they can maintain balance. An abnormal finding in the test of station is if the feet are placed far apart. Why would a wide stance suggest problems with cerebellar function?
The cerebellum controls performance of rapid movements by :-a- directly stimulating AHCs of the acting musclesb- by storing pre-planed motor programs for these movementsc- by rapidly receiving proprioceptive information from the acting musclesd- by inhibiting antagonistic muscles
Representation of the body in the primary motor area :-a- is ipsilateralb- is uprightc- is disproportionate to the actual anatomical size of the represented regiond- all the above are correct
Motor signals in the ANS always pass through _ (a number. motor neuron (s. before reaching a muscle. Motor signals in the SNS always pass through _ (a number. motor neuron (s. before reaching a muscle. a. 2,2 b. 2,1 c. 1,3 d. 1,2
Premotor cortex is associated with ___________, whereas the supplementary motor area is associated with ___________. a. Preparing well-learned complex sequence of motor responses; preparing motor responses in accordance to external conditions b. Preparing motor responses in accordance to external conditions; preparing well-learned complex sequence of motor responses c. Firing during a movement; firing after a movement d. Firing shortly before a movement; firing long before a movement e. Firing after a movement; firing during a movement
The discharge from Golgi tendon organs initiated by excessive stretch ofa skeletal muscle produces :-a- inhibition of α -motor neurons of antagonistic musclesb- inhibition of γ-motor neurons of antagonistic musclesc- inhibition of α -motor neurons of the same muscled- stimulation of γ-motor neurons of the same muscle
In your own words how are drugs and toxins can have direct and indirect stimulation of the motor nerve
Fasciculations of lower motor neuron lesions :-a- are caused by injury currents initiated in the denervated muscle fibersb- can be recorded by electromyogramc- consist of asynchronous contraction of the muscle fibers composing a motor unitd- develop later than fibrillations of the muscle fibers
Co-activation of α and γ-motor neurons :-a- increases γ-motor neuron discharge whenever the activity of α-motor neurons rises to a high levelb- is mediated by interneurons that link the α and γ-motor neuronsc- maintains the proprioceptive information to higher centers during muscle contractiond- increases the α-motor neuron discharge whenever the activity of γ-motor neurons rises to a high level