Human Anatomy
5th Edition
ISBN: 9780073403700
Author: Kenneth S. Saladin Dr.
Publisher: McGraw-Hill Education
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Chapter 14, Problem 2TYC
Summary Introduction
To analyze:
The spinal tract injury and the reason for the losses on the opposite side of the body.
Introduction:
Dissociated sensory loss is neurological damage in the single tract of the spinal cord due to a lesion. The condition results in loss of proprioception, fine touch and selective loss of temperature and pain.
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Wallace is the victim of a hunting accident. A bullet grazed his vertebral column, and bone fragments severed the left half of his spinal cord at segments T8 through T10. Since the accident, Wallace has had a conditioncalled dissociated sensory loss, in which he feels no sensations of deep touch or limb position on the left side of his body below the injury, and no sensations of pain or heat from the right side. Explain what spinal tract(s) the injury has affected and why these sensory losses are on opposite sides of the body.
Complete transection of the spinal cord produces all of the following effects, except :-a- permanent loss of all sensations mediated by the cord below level of lesionb- permanent loss of voluntary movements by muscles innervated by the cord below level of lesionc- permanent loss of reflexes mediated by the cord below level of lesiond- temporary loss of micturition reflexes
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Chapter 14 Solutions
Human Anatomy
Ch. 14.1 - Prob. 1AWYKCh. 14.1 - Prob. 1BYGOCh. 14.1 - Prob. 2BYGOCh. 14.1 - Prob. 3BYGOCh. 14.1 - Prob. 4BYGOCh. 14.1 - Identify each of the following spinal tracts with...Ch. 14.2 - How does the structure of a nerve compare to that...Ch. 14.2 - Prob. 6BYGOCh. 14.2 - Prob. 7BYGOCh. 14.2 - List the five plexuses of spinal nerves and state...
Ch. 14.2 - State which plexus gives rise to each of the...Ch. 14.3 - Prob. 1AWYKCh. 14.3 - Prob. 10BYGOCh. 14.3 - Prob. 11BYGOCh. 14.3 - Describe a situation in which each of the...Ch. 14.4 - Prob. 1AWYKCh. 14.4 - Prob. 13BYGOCh. 14.4 - Prob. 14BYGOCh. 14.4 - Prob. 15BYGOCh. 14 - Four functions of the spinal cord and their...Ch. 14 - Prob. 14.1.2AYLOCh. 14 - Prob. 14.1.3AYLOCh. 14 - Prob. 14.1.4AYLOCh. 14 - Prob. 14.1.5AYLOCh. 14 - Prob. 14.1.6AYLOCh. 14 - Prob. 14.1.7AYLOCh. 14 - Prob. 14.1.8AYLOCh. 14 - The funiculi and tracts of spinal white matterCh. 14 - Prob. 14.1.10AYLOCh. 14 - Prob. 14.1.11AYLOCh. 14 - Prob. 14.1.12AYLOCh. 14 - Prob. 14.1.13AYLOCh. 14 - Prob. 14.2.1AYLOCh. 14 - The differences between afferent and efferent...Ch. 14 - Prob. 14.2.3AYLOCh. 14 - Prob. 14.2.4AYLOCh. 14 - The number of spinal nerves and the system for...Ch. 14 - The structure of the proximal portion of a spinal...Ch. 14 - Prob. 14.2.7AYLOCh. 14 - The five plexuses of spinal nerves-their names,...Ch. 14 - Prob. 14.3.1AYLOCh. 14 - The components of a reflex arc and the path...Ch. 14 - Prob. 14.3.3AYLOCh. 14 - The differences between ipsilateral,...Ch. 14 - Prob. 14.3.5AYLOCh. 14 - Prob. 14.4.1AYLOCh. 14 - Prob. 14.4.2AYLOCh. 14 - Prob. 14.4.3AYLOCh. 14 - Below L2, the vertebral canal is occupied by a...Ch. 14 - The brachial plexus gives rise to all of the...Ch. 14 - Prob. 3TYRCh. 14 - Prob. 4TYRCh. 14 - Prob. 5TYRCh. 14 - Prob. 6TYRCh. 14 - In the spinal cord, the neurosomas of the lower...Ch. 14 - Prob. 8TYRCh. 14 - Prob. 9TYRCh. 14 - Prob. 10TYRCh. 14 - Prob. 11TYRCh. 14 - Prob. 12TYRCh. 14 - Prob. 13TYRCh. 14 - Motor innervation of the leg proper comes...Ch. 14 - Prob. 15TYRCh. 14 - The _______ nerves arise from the servical plexus...Ch. 14 - The crossing of a nerve fiber actract from the...Ch. 14 - Prob. 18TYRCh. 14 - Prob. 19TYRCh. 14 - Prob. 20TYRCh. 14 - Prob. 1BYMVCh. 14 - Prob. 2BYMVCh. 14 - Prob. 3BYMVCh. 14 - Prob. 4BYMVCh. 14 - State a meaning of each word element and give a...Ch. 14 - Prob. 6BYMVCh. 14 - Prob. 7BYMVCh. 14 - Prob. 8BYMVCh. 14 - Prob. 9BYMVCh. 14 - Prob. 10BYMVCh. 14 - Prob. 1TOFCh. 14 - Prob. 2TOFCh. 14 - Prob. 3TOFCh. 14 - Briefly explain why each of the following...Ch. 14 - Prob. 5TOFCh. 14 - Prob. 6TOFCh. 14 - Prob. 7TOFCh. 14 - Briefly explain why each of the following...Ch. 14 - Prob. 9TOFCh. 14 - Prob. 10TOFCh. 14 - Prob. 1TYCCh. 14 - Prob. 2TYCCh. 14 - Anthony gets into a fight between rival gangs. As...Ch. 14 - When a patient needs a tendon graft, surgeons...
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- A person who was injured in a car accident exhibits the followingsymptoms: extreme paresis on the right side, including the arm andleg; reduction of pain sensation on the left side; and normal tactilesensation on both sides. Which tracts are damaged? Where in the spinalcord did the patient suffer tract damage?arrow_forwardAs with most spinal nerves, the sacral spinal nerves become part of a nerve plexus, the sacral plexus. What is a nerve plexus? dermatome maps explain sensory supply, and this patient did not have any motor problems. So which root(s) of nerves were affected, dorsal or ventral? Explain your answer.arrow_forwardA 45-year-old man complains of shooting pain down his right leg that worsens with sitting and coughing. He also has some numbness in the area. The physician tests sensations of the lateral thigh region. Which of the following spinal nerve levels is being tested? L4 and L5 S3 and S4 O L2 and L3 S1 and S2 O L1 and L2arrow_forward
- Fill in the blank: The dorsal root of a spinal nerve contains the _______________________ neurons.arrow_forwardwhy does the injury of the spinal cord at the lumbar region would lead to paralysis and loss of sensations of the lower limbs (legs)?arrow_forwardA person with a spinal cord injury is experiencing loss of pain sensation in his left leg and loss of tactile sensation in his right leg. On which side of the spinal cord is the injury located? Explainarrow_forward
- An individual is unable to close his left eye with ears overflowing on the left cheek and saliva dribbling from the left mouth angle. what is the reason for his sad condition? What nerve is damaged and how is the integrity of the nerve tested?arrow_forwardAn individual has a spinal cord injury superior to the area involved in the patellar reflex circuit such that all communication to the brain is broken off. How would this affect the operation of the patellar reflex circuit?arrow_forwardInjury to the accessory nerve may result in sternocleidomastoid muscledysfunction, a condition called torticollis (sometimes called wry neck),in which the head is drawn to one side. If the head is turned to the left,does this position indicate injury to the left or the right spinal componentof the accessory nerve?arrow_forward
- Will pain be felt upon stimulation of the central stump of the left vagus nerve if it was ligated? Explainarrow_forwardAn 18-year-old male is shot in the back and is taken to the emergency room. A neurological exam reveals a hemisection of the right half of the spinal cord extending from T8 to T12. Which of the following deficits will most likely result from this injury? Loss of pain and temperature sensation from the left arm and leg; loss of conscious proprioception from the right arm and leg; extreme weakness of right arm and leg O Loss of pain and temperature sensation from the right leg; loss of conscious proprioception from the left leg; extreme weakness of left leg O Loss of pain and temperature sensation from the left leg; loss of conscious proprioception from the right leg; extreme weakness of right leg Loss of pain and temperature sensation from the right arm; loss of conscious proprioception from the left arm; extreme weakness of left arm O Loss of pain and temperature sensation from the left arm; loss of conscious proprioception from the right arm; extreme weakness of right armarrow_forwardA patient with a cerebral lesion exhibits loss of fine motor control ofthe left hand, arm, forearm, and shoulder. All other motor and sensoryfunctions appear to be intact. Describe the location of the lesion asprecisely as possiblearrow_forward
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