Textbook Question
The tracts of the posterior columns decussate in the ________, whereas the tracts of the anterolateral system decussate in the ________.
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13. The Peripheral Nervous System
Organization of Sensory Pathways
Problem 1a
Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
a. The somatic sensory division of the PNS detects sensory stimuli from the organs in the thoracic and abdominopelvic cavities.
Verified step by step guidance1
Step 1: Understand the terminology in the statement. The somatic sensory division of the peripheral nervous system (PNS) is responsible for detecting sensory stimuli from the skin, muscles, bones, and joints, not from internal organs. Sensory stimuli from internal organs are detected by the visceral sensory division of the PNS.
Step 2: Analyze the statement provided. The statement claims that the somatic sensory division detects sensory stimuli from organs in the thoracic and abdominopelvic cavities. This is incorrect because these organs are part of the visceral sensory division's domain.
Step 3: Correct the false statement. Replace 'somatic sensory division' with 'visceral sensory division' to make the statement true. The corrected statement should read: 'The visceral sensory division of the PNS detects sensory stimuli from the organs in the thoracic and abdominopelvic cavities.'
Step 4: Review the corrected statement to ensure it aligns with the functions of the visceral sensory division, which is responsible for monitoring internal organ activity and transmitting sensory information to the central nervous system.
Step 5: Confirm the distinction between somatic and visceral sensory divisions to reinforce understanding. The somatic sensory division deals with external stimuli (e.g., touch, pain, temperature), while the visceral sensory division handles internal stimuli from organs.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Somatic Sensory Division
The somatic sensory division of the peripheral nervous system (PNS) is responsible for transmitting sensory information from the skin, muscles, and joints to the central nervous system (CNS). It primarily detects stimuli related to touch, temperature, pain, and proprioception, which helps the body understand its position and movement in space.
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Visceral Sensory Division
The visceral sensory division of the PNS is responsible for conveying sensory information from the internal organs, particularly those in the thoracic and abdominopelvic cavities, to the CNS. This division detects sensations such as hunger, thirst, and the fullness of the bladder, which are crucial for maintaining homeostasis and responding to internal bodily states.
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Peripheral Nervous System (PNS)
The peripheral nervous system (PNS) consists of all the nerves outside the brain and spinal cord, connecting the CNS to limbs and organs. It is divided into the somatic and autonomic nervous systems, with the somatic system controlling voluntary movements and sensory information, while the autonomic system regulates involuntary functions like heart rate and digestion.
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