Explanation The patellar ligament is present at the distal portion of the tendon of the quadriceps femoris. The muscle quadricep femoris has the sensory stretch receptors responsible for the patellar reflex. When the patellar ligament is stroked with an object, the following events occur in a sequential manner that results in patellar reflex: Stretching of quadriceps femoris...

Laboratory Manual For Human Anatomy & Physiology

4th Edition

ISBN: 9781260159363

Author: Martin, Terry R., Prentice-craver, Cynthia

Publisher: McGraw-Hill Publishing Co.

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Question

Chapter 29, Problem 2.14A

Summary Introduction

To write:

The major events occurring in the patellar reflex, from striking of the patellar ligament to the resulting response.

Introduction:

The patellar reflex is also known as the knee jerk. Segments L4, L3, and L2 of the spinal cord are

responsible for controlling the reflexes of the knee. The reflex arc of the patellar reflex does not

include any interneuron for the contraction of the effector muscles.

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Chapter 29, Problem 2.13A

Chapter 30, Problem 1PL

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Do you think the patellar reflex would be inhibited or enhanced by actively contracting the quadriceps muscle group? With an understanding of how muscle spindle fibers work, explain how active contraction of a muscle might affect the myotactic reflex. [hint: try to elicit a knee jerk reflex when someone is doing a leg lift]

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Chapter 29 Solutions

Laboratory Manual For Human Anatomy & Physiology

Ch. 29 - The impulse over a motor neuron will lead to a. an...Ch. 29 - Stretch reflex receptors are called a. effectors....Ch. 29 - Stretch reflexes include ail of the following...Ch. 29 - Prob. 4PL Ch. 29 - Prob. 5PL Ch. 29 - The quadriceps femoris is the effector muscle of...Ch. 29 - The posterior roots of spinal nerves contain the...Ch. 29 - The normal patellar reflex response involves...Ch. 29 - A withdrawal reflex employs...Ch. 29 - Interneurons in a withdrawal reflex are located in...

Ch. 29 - A reflex arc begins with the stimulation of a...Ch. 29 - Effectors of somatic reflex arcs are...Ch. 29 - Prob. 2.5A Ch. 29 - The effector muscle of the patellar reflex is the...Ch. 29 - The sensory stretch receptors (muscle spindles) of...Ch. 29 - The posterior root of a spinal nerve contains the...Ch. 29 - The normal plantar reflex results in...Ch. 29 - Stroking the sole of the foot in infants results...Ch. 29 - In a stretch reflex arc, when the agonist muscle...Ch. 29 - Synapses, whether excitatory or inhibitory, occur...Ch. 29 - Prob. 2.13A Ch. 29 - Prob. 2.14A

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