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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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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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]
In the patellar tendon reflex, what is the name of the receptors being struck by the reflex hammer?
What is the specific reflex arc, the function of the reflex, and the clinical appilications specific to the reflex of the patellar?
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. 4PLCh. 29 - Prob. 5PLCh. 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. 2.5ACh. 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. 2.13ACh. 29 - Prob. 2.14A
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- When a physician elicits the patellar reflex, what physiological activities are being examined? List four. (Hint: think of the function of each component of the reflex pathway).arrow_forwardDescribe patellar reflex and explain the reason why patellar reflex can cease to function or function abnormally.arrow_forwardThe central junction of the reflex arc for the patellar reflex consists only of a synapse between the afferent and efferent neuron. Diagram such a reflex arc and label the five major components.arrow_forward
- Give the parts of the reflex arc for the patellar reflex including the main components and the nerve carrying both afferent and efferent impulses.arrow_forwardLabel the patellar reflex arc and reciprocal innervation in Figure .arrow_forwardConcerning the patellar reflex, compare the reflex with and without Jendrassik's maneuver. The central junction of the reflex arc for the patellar reflex consists only of a synapse between the afferent and efferent neuron. Diagram such a reflex arc and label the five major components.arrow_forward
- Callisto survives the accident and goes to jail. Many years later she is found slumped in her cell, quite confused and with apparent paralysis in her right arm. When the jailer speaks to her, she is unable to produce any clear speech. Callisto can understand very simple sentences, and her sight is not affected. It is determined that she has a vascular occlusion (blockage) in her internal carotid artery. Callisto’s blood pressure is markedly lower than would be expected under physiological conditions. Based on this information, how are these structures in brain affected (if they are). Provide justification. Short answers. 1. Broca's area 2. Right posterior cerebral artery 3. Autonomic nervous systemarrow_forwardWhat is affected by electrical signal sent by forth reflex arc structure?(This will be the fifth structure in the arc.)arrow_forwardIs the patellar reflex altered during Jendrassik’s maneuver? If so, How and why do you think this might happen?arrow_forward
- Using a reflex hammer, which of the following reflexes are assessed to determine the patient's neurologic condition? I. Patellar reflex and Babinski reflex II. Achilles tendon reflex and Triceps reflex III. Brachial reflex and Pupillary reflex IV. Plantar reflex and Pharyngeal reflexarrow_forwardSeveral of the events that occur between the time a physician strikes apatient’s patellar tendon with a rubber hammer and the time the quadriceps femoris contracts (knee-jerk reflex) are listed below:(1) increased frequency of action potentials in sensory neurons(2) stretch of the muscle spindles(3) increased frequency of action potentials in the alpha motor neurons(4) stretch of the quadriceps femoris(5) contraction of the quadriceps femorisWhich of the following most closely describes the sequence ofevents as they normally occur?a. 4,1,2,3,5 c. 1,4,3,2,5 e. 4,2,3,1,5b. 4,1,3,2,5 d. 4,2,1,3,5arrow_forwardThe biceps-jerk reflex is carried out by motor neurons that exit the spinal cord in the fifth spinal nerve (C5). The triceps-jerk reflex uses motor neurons in the seventh spinal nerve (C7). Describe how these reflexes might be tested to help pinpoint damage in a patient with a neck injury.arrow_forward
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