Textbook Question
Explain how the cerebellum is physically connected to the brain stem.
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Ch. 12 The Central Nervous System
Marieb, Hoehn11th EditionHuman Anatomy & PhysiologyISBN: 9780136874034
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Table of contents
- Ch. 1 The Human Body: An Orientation24
- Ch. 2 Chemistry Comes Alive25
- Ch. 3 Cells: The Living Units21
- Ch. 4 Tissue: The Living Fabric20
- Ch. 5 The Integumentary System11
- Ch. 6 Bones and Skeletal Tissues19
- Ch. 7 The Skeleton14
- Ch. 8 Joints7
- Ch. 9 Muscles and Muscle Tissue26
- Ch. 10 The Muscular System26
- Ch. 11 Fundamentals of the Nervous System and Nervous Tissue19
- Ch. 12 The Central Nervous System26
- Ch. 13 The Peripheral Nervous System and Reflex Activity32
- Ch. 14 The Autonomic Nervous System19
- Ch. 15 The Special Senses26
- Ch. 16 The Endocrine System23
- Ch. 17 Blood25
- Ch. 18 The Cardiovascular System: The Heart24
- Ch. 19 The Cardiovascular System: Blood Vessels27
- Ch. 20 The Lymphatic System and Lymphoid Organs and Tissues14
- Ch. 21 The Immune System: Innate and Adaptive Body Defenses27
- Ch. 22 The Respiratory System21
- Ch. 23 The Digestive System31
- Ch. 24 Nutrition, Metabolism, and Energy Balance26
- Ch. 25 The Urinary System26
- Ch. 26 Fluid, Electrolyte, and Acid-Base Balance24
- Ch. 27 The Reproductive System24
- Ch. 28 Pregnancy and Human Development25
- Ch. 29 Heredity11
Marieb, Hoehn11th EditionHuman Anatomy & PhysiologyISBN: 9780136874034Not the one you use?Change textbook
Chapter 12, Problem 14
All of the following descriptions refer to dorsal column–medial lemniscal ascending pathways except one:
a. They include the fasciculus gracilis and fasciculus cuneatus.
b. They include a chain of three neurons.
c. Their connections are diffuse and poorly localized.
d. They are concerned with precise transmission of one or a few related types of sensory input.
Verified step by step guidance1
Step 1: Understand the dorsal column–medial lemniscal pathway. This ascending sensory pathway transmits fine touch, vibration, and proprioceptive information from the body to the brain.
Step 2: Review the components of the pathway. It includes the fasciculus gracilis and fasciculus cuneatus, which carry sensory information from the lower and upper body respectively.
Step 3: Recall the number of neurons involved. The pathway typically involves a chain of three neurons: the first-order neuron in the dorsal root ganglion, the second-order neuron in the medulla, and the third-order neuron in the thalamus.
Step 4: Consider the nature of the sensory connections. The dorsal column–medial lemniscal pathway is known for precise and well-localized transmission of sensory information, not diffuse or poorly localized connections.
Step 5: Identify the exception by comparing each statement to the known characteristics of the pathway. The statement that contradicts the precise and localized nature of the pathway is the correct exception.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Dorsal Column–Medial Lemniscal Pathway Anatomy
This pathway includes the fasciculus gracilis and fasciculus cuneatus, which carry sensory information from the lower and upper body, respectively. It is an ascending sensory tract in the spinal cord responsible for transmitting fine touch, vibration, and proprioception to the brain.
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2:48
Circuit Level & Perceptual Level
Three-Neuron Chain in Sensory Pathways
The dorsal column–medial lemniscal pathway consists of a chain of three neurons: the first-order neuron carries signals from the periphery to the medulla, the second-order neuron crosses over and ascends to the thalamus, and the third-order neuron projects to the sensory cortex for processing.
Recommended video:
1:06Organization of Sensory Pathways Example 1
Localization and Specificity of Sensory Transmission
This pathway is characterized by precise and well-localized transmission of sensory information, allowing the brain to accurately identify the location and type of stimulus. Unlike diffuse pathways, it conveys specific modalities such as fine touch and proprioception with high fidelity.
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2:47Sensory Receptors
Related Practice
Textbook Question
a. Make a rough drawing of the lateral aspect of the left cerebral hemisphere.
b. You may be thinking, 'But I just can't draw!' So, name the hemisphere involved with most people's ability to draw.
c. On your drawing, locate the following areas and provide the major function of each: primary motor cortex, premotor cortex, somatosensory association cortex, primary somatosensory cortex, visual and auditory areas, prefrontal cortex, Wernicke's and Broca's areas.
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Textbook Question
What constitutes the blood brain barrier?
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Textbook Question
A number of brain structures are listed below. If an area is primarily gray matter, write a in the answer blank; if mostly white matter, respond with b.
________ (1) cerebral cortex
________ (2) corpus callosum and corona radiata
________ (3) red nucleus
________ (4) medial and lateral nuclear groups
________ (5) medial lemniscus
________ (6) cranial nerve nuclei
________ (7) spinothalamic tract
________ (8) fornix
________ (9) cingulate and precentral gyri
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Textbook Question
A patient has suffered a cerebral hemorrhage that has caused dysfunction of the precentral gyrus of his right cerebral cortex. As a result:
a. He cannot voluntarily move his left arm or leg.
b. He feels no sensation on the left side of his body.
c. He feels no sensation on his right side.
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Textbook Question
a. What is the advantage of having a cerebrum that is highly convoluted?
b. What term is used to indicate its grooves? Its outward folds?
c. Which groove divides the cerebrum into two hemispheres?
d. What divides the parietal from the frontal lobe? The parietal from the temporal lobe?
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