A&P UNITY AND FUNCTION ACCESS
A&P UNITY AND FUNCTION ACCESS
9th Edition
ISBN: 9781264893683
Author: SALADIN
Publisher: MCG
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Chapter 13, Problem 1TYR

Below L2. the vertebral canal is occupied by a bundle of spinal nerve roots called

  1. a. the terminal filum.
  2. b. the descending tracts.
  3. c. the gracile fasciculus
  4. d. the medullary cone.
  5. e. the cauda equina.
Expert Solution & Answer
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Summary Introduction

Introduction:

Spinal cord is a collection of nerve tissue that arises from the brain stem.

Answer to Problem 1TYR

Correct answer:

Below L2, the vertebral canal is occupied by a bundle of spinal nerve roots called the cauda equina. Therefore, option e is correct.

Explanation of Solution

Justify reasons for the correct statement:

Cauda equina is a collection of spinal nerves at the first lumbar vertebra and medullary cone. It occupies the vertebral canal from L2 to S5.

Option (e) is given as “the cauda equina”.

Cauda equina has approximately 10 fiber pairs that consist of 3 to 5 lumber fibers, 5 sacral fiber pairs, and 1 one coccygeal nerve. The cauda equina functions as to send and receive messages from the pelvic and the lower limbs.

Hence, option (e) is correct.

Justify reasons for the incorrect statements:

Option (a) is given as “the terminal filum.

It is a delicate fibrous tissue or terminal thread that precedes downward from the apex of the conus medullaris. Hence, it is a wrong answer.

Option (b) is given as “the descending tracts”.

The descending tracts are motor signals that carry the signals from the brain to lower motor neurons. Hence, it is a wrong answer.

Option (c) is given as, “the gracile fasciculus”.

It carries signals from the mid-thoracic and lower parts of the body. Hence, it is a wrong answer.

Option (d) is given as “the medullary cone”.

The medullary cone or the conus medullaris occurs at the lumbar vertebral level 1 and level 2. Hence, it is a wrong answer.

Hence, options (a), (b), (c), and (d) are incorrect.

Conclusion

In conclusion, the cauda equina is a collection of spinal nerve that occurs below the lumbar vertebral level 2 and occupies from L2 to S5.

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Chapter 13 Solutions

A&P UNITY AND FUNCTION ACCESS

Ch. 13.1 - Prob. 6AYLOCh. 13.1 - Prob. 7AYLOCh. 13.1 - Prob. 8AYLOCh. 13.1 - The position of the posterior and anterior horns...Ch. 13.1 - Prob. 10AYLOCh. 13.1 - Prob. 11AYLOCh. 13.1 - Prob. 12AYLOCh. 13.1 - Names and functions of the descending tractsCh. 13.1 - Prob. 14AYLOCh. 13.1 - Prob. 15AYLOCh. 13.1 - Prob. 16AYLOCh. 13.2 - Prob. 6BYGOCh. 13.2 - Prob. 7BYGOCh. 13.2 - Prob. 8BYGOCh. 13.2 - Prob. 9BYGOCh. 13.2 - Prob. 1AYLOCh. 13.2 - Prob. 2AYLOCh. 13.2 - Prob. 3AYLOCh. 13.2 - Prob. 4AYLOCh. 13.2 - Prob. 5AYLOCh. 13.2 - Prob. 6AYLOCh. 13.2 - Prob. 7AYLOCh. 13.2 - Prob. 8AYLOCh. 13.2 - Prob. 9AYLOCh. 13.2 - Prob. 10AYLOCh. 13.2 - Prob. 11AYLOCh. 13.2 - Prob. 12AYLOCh. 13.3 - Name five structural components of a typical...Ch. 13.3 - State the function of each of the following in a...Ch. 13.3 - Prob. 12BYGOCh. 13.3 - Prob. 13BYGOCh. 13.3 - Prob. 14BYGOCh. 13.3 - Prob. 1AYLOCh. 13.3 - The pathway and constituents of a somatic reflex...Ch. 13.3 - Prob. 3AYLOCh. 13.3 - Structure and function of muscle spindlesCh. 13.3 - Stretch reflexes; one or more examples; the...Ch. 13.3 - Prob. 6AYLOCh. 13.3 - Prob. 7AYLOCh. 13.3 - Prob. 8AYLOCh. 13.3 - Prob. 9AYLOCh. 13 - Below L2. the vertebral canal is occupied by a...Ch. 13 - Prob. 2TYRCh. 13 - Nerve fibers that adjust the tension in a muscle...Ch. 13 - A stretch reflex requires the action of _______ to...Ch. 13 - Prob. 5TYRCh. 13 - Prob. 6TYRCh. 13 - Prob. 7TYRCh. 13 - Prob. 8TYRCh. 13 - Prob. 9TYRCh. 13 - Prob. 10TYRCh. 13 - Prob. 11TYRCh. 13 - Prob. 12TYRCh. 13 - The cerebellum receives feedback from the muscles...Ch. 13 - In the ______ reflex, contraction of flexor...Ch. 13 - Prob. 15TYRCh. 13 - Prob. 16TYRCh. 13 - Prob. 17TYRCh. 13 - Prob. 18TYRCh. 13 - Prob. 19TYRCh. 13 - Prob. 20TYRCh. 13 - arachno-Ch. 13 - Prob. 2BYMVCh. 13 - Prob. 3BYMVCh. 13 - Prob. 4BYMVCh. 13 - Prob. 5BYMVCh. 13 - Prob. 6BYMVCh. 13 - Prob. 7BYMVCh. 13 - Prob. 8BYMVCh. 13 - Prob. 9BYMVCh. 13 - tecto-Ch. 13 - Prob. 1WWTSCh. 13 - Prob. 2WWTSCh. 13 - Prob. 3WWTSCh. 13 - Some spinal nerves are sensory and others are...Ch. 13 - Prob. 5WWTSCh. 13 - The anterior and posterior horns of the spinal...Ch. 13 - Prob. 7WWTSCh. 13 - Prob. 8WWTSCh. 13 - Prob. 9WWTSCh. 13 - Prob. 10WWTSCh. 13 - Jillian is thrown from a horse. She strikes the...Ch. 13 - Wallace is the victim of a hunting accident. A...Ch. 13 - Anthony gets into a fight between rival gangs As...Ch. 13 - Stand with your right shoulder, hip, and foot...Ch. 13 - When a patient needs a tendon graft, surgeons...
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