Explanation Explanation/justification for the correct answer: Option (c). Plantar flexion of the foot. Calcaneal reflex is also known as the ankle jerk reflex. It takes place due to the tapping of the Achilles tendon while the foot is dorsiflexed. It is a sort of stretch reflex. It tests the role of the gastrocnemius muscle. Also, it tests the function of the nerve that supplies it. The plantaris tendon extends below both the gastrocnemius and the soleus muscles and directly joins with the heel bone. Hence, the option (c) is correct. Explanation for the incorrect answer: Option (a) Pain interpretation. Pain is generally felt when the special nerves which detect the tissue injury send signals to convey message about the damage through the spinal cord towards the brain...

LABORATORY MANUAL FOR HUMAN ANATOMY & PH

4th Edition

ISBN: 9781260254426

Author: Martin

Publisher: MCG

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Question

Chapter 29, Problem 5PL

Summary Introduction

Introduction: The stretch reflex is a muscle contraction which occurs in response to the stretching in the muscle. The muscle spindle is stretched when the muscle lengthens and its nerve activity also increases. This raises the alpha motor neuron activity. It causes the contraction of the muscle fibers and as a result resists the stretching.

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Chapter 29, Problem 4PL

Chapter 29, Problem 6PL

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Chapter 29 Solutions

LABORATORY MANUAL FOR HUMAN ANATOMY & PH

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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Solution Summary: The author explains that the stretch reflex is a muscle contraction that occurs in response to the stretching in the muscle.

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