Domanda del libro di testo
Which of the following somatic sensations is not carried by the posterior columns?
a. Tactile senses
b. Temperature
c. Proprioception
d. Stretch
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Ch. 13 The Peripheral Nervous System
Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822
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TOC.tableOfContents
- Ch. 1 Introduction to Anatomy and Physiology26
- Ch. 2 The Chemistry of Life38
- Ch. 3 The Cell55
- Ch. 4 Histology47
- Ch. 5 The Integumentary System30
- Ch. 6 Bones and Bone Tissue36
- Ch. 7 The Skeletal System40
- Ch. 8 Articulations19
- Ch. 9 The Muscular System36
- Ch. 10 Muscle Tissue and Physiology29
- Ch. 11 Introduction to the Nervous System and Nervous Tissue28
- Ch. 12 The Central Nervous System42
- Ch. 13 The Peripheral Nervous System41
- Ch. 14 The Autonomic Nervous System and Homeostasis31
- Ch. 15 The Special Senses39
- Ch. 16 The Endocrine System42
- Ch. 17 The Cardiovascular System I: The Heart30
- Ch. 18 The Cardiovascular System II: The Blood Vessels43
- Ch. 19 Blood32
- Ch. 20 The Lymphatic System and Immunity45
- Ch. 21 The Respiratory System27
- Ch. 22 The Digestive System27
- Ch. 23 Metabolism and Nutrition7
- Ch. 24 The Urinary System39
- Ch. 25 Fluid, Electrolyte, and Acid-Base Homeostasis39
- Ch. 26 The Reproductive System10
- Ch. 27 Development and Heredity5
Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822Non è quello che usi tu?Cambia libro di testo
Capitolo 13, Problema 18
Which two cranial nerves mediate the gag reflex?
Guida verificata passo dopo passo1
Understand the gag reflex: The gag reflex is a protective mechanism that prevents foreign objects from entering the throat and airway. It involves sensory and motor components mediated by cranial nerves.
Identify the sensory component: The sensory part of the gag reflex detects the presence of a stimulus (e.g., touch or irritation) in the back of the throat or pharynx. This is mediated by the glossopharyngeal nerve (cranial nerve IX).
Identify the motor component: The motor part of the gag reflex triggers the contraction of muscles in the pharynx to expel the stimulus. This is mediated by the vagus nerve (cranial nerve X).
Recognize the interaction: The glossopharyngeal nerve (cranial nerve IX) carries sensory information to the brainstem, which then activates the vagus nerve (cranial nerve X) to produce the motor response.
Summarize the cranial nerves involved: The gag reflex is mediated by cranial nerve IX (glossopharyngeal nerve) for sensory input and cranial nerve X (vagus nerve) for motor output.
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Cranial Nerves
Cranial nerves are a set of twelve paired nerves that emerge directly from the brain, primarily responsible for sensory and motor functions of the head and neck. Each nerve has specific roles, including the transmission of sensory information and the control of muscle movements. Understanding which cranial nerves are involved in reflex actions, such as the gag reflex, is essential for comprehending their physiological functions.
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Overview of Cranial Bones
Gag Reflex
The gag reflex, or pharyngeal reflex, is an involuntary contraction of the muscles at the back of the throat triggered by stimulation of the soft palate or the back of the throat. This reflex serves as a protective mechanism to prevent choking and aspiration of foreign objects. Identifying the cranial nerves that mediate this reflex is crucial for understanding its neurological pathways and clinical significance.
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3:37Stretch Reflex
Glossopharyngeal and Vagus Nerves
The glossopharyngeal nerve (Cranial Nerve IX) and the vagus nerve (Cranial Nerve X) are the two cranial nerves primarily responsible for mediating the gag reflex. The glossopharyngeal nerve provides sensory input from the oropharynx, while the vagus nerve controls the motor response of the pharyngeal muscles. Their coordinated action is essential for the proper functioning of the gag reflex, highlighting the interplay between sensory and motor pathways in reflex actions.
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2:25Nerves and Blood Supply
Pratica correlata
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Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
b. The Golgi tendon organs detect stretch in a simple stretch reflex.
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b. Thermoreceptors send temperature information to centers in the hypothalamus.
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Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
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