Textbook Question
Since there are only three types of cones, how can you explain the fact that we see many more colors?
2
views
Ch. 13 The Peripheral Nervous System and Reflex Activity
Marieb, Hoehn7th EditionHuman Anatomy & PhysiologyISBN: 9780805359091
Not the one you use?Change textbookSelect a different textbook
Table of contents
- Ch. 1 The Human Body: An Orientation24
- Ch. 2 Chemistry Comes Alive25
- Ch. 3 Cells: The Living Units24
- Ch. 4 Tissue: The Living Fabric19
- Ch. 5 The Integumentary System10
- Ch. 6 Bones and Skeletal Tissues19
- Ch. 7 The Skeleton11
- Ch. 8 Joints7
- Ch. 9 Muscles and Muscle Tissue26
- Ch. 10 The Muscular System26
- Ch. 11 Fundamentals of the Nervous System and Nervous Tissue23
- Ch. 12 The Central Nervous System26
- Ch. 13 The Peripheral Nervous System and Reflex Activity28
- Ch. 14 The Autonomic Nervous System18
- Ch. 16 The Endocrine System26
- Ch. 17 Blood27
- Ch. 18 The Cardiovascular System: The Heart22
- Ch. 19 The Cardiovascular System: Blood Vessels27
- Ch. 20 The Lymphatic System and Lymphoid Organs and Tissues16
- Ch. 21 The Immune System: Innate and Adaptive Body Defenses29
- Ch. 22 The Respiratory System20
- Ch. 23 The Digestive System30
- Ch. 24 Nutrition, Metabolism, and Energy Balance26
- Ch. 25 The Urinary System25
- Ch. 26 Fluid, Electrolyte, and Acid-Base Balance24
- Ch. 27 The Reproductive System23
Marieb, Hoehn7th EditionHuman Anatomy & PhysiologyISBN: 9780805359091Not the one you use?Change textbook
All textbooks
Marieb, Hoehn 7th EditionCh. 13 The Peripheral Nervous System and Reflex ActivityProblem 35
Marieb, Hoehn 7th EditionCh. 13 The Peripheral Nervous System and Reflex ActivityProblem 35Chapter 13, Problem 35
What is the structural and functional relationship between spinal nerves, skeletal muscles, and dermatomes?
Verified step by step guidance1
Understand that spinal nerves are mixed nerves that emerge from the spinal cord and contain both motor and sensory fibers. These nerves play a crucial role in connecting the central nervous system to the peripheral structures.
Recognize that skeletal muscles receive motor innervation from specific spinal nerves. Each spinal nerve controls the contraction of certain muscles, enabling voluntary movement. This motor function is essential for muscle control and coordination.
Learn that dermatomes are specific areas of skin innervated by sensory fibers from a single spinal nerve. Each dermatome corresponds to a particular spinal nerve, allowing the mapping of sensory input from the skin to the spinal cord.
Explore the functional relationship: spinal nerves transmit motor commands to skeletal muscles and carry sensory information from dermatomes back to the spinal cord. This bidirectional communication allows for coordinated motor responses and sensory perception.
Summarize the structural relationship: spinal nerves physically connect the spinal cord to both skeletal muscles (via motor fibers) and dermatomes (via sensory fibers), establishing an integrated system for movement and sensation.
Verified video answer for a similar problem:
This video solution was recommended by our tutors as helpful for the problem above.
Video duration:
2mWas this helpful?
Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Spinal Nerves
Spinal nerves are mixed nerves that emerge from the spinal cord, carrying motor, sensory, and autonomic signals between the spinal cord and the body. Each spinal nerve innervates specific muscles and skin regions, playing a crucial role in transmitting information for movement and sensation.
Recommended video:
4:04
Splanchnic Nerves and the Adrenal Medulla
Skeletal Muscles Innervation
Skeletal muscles receive motor innervation from spinal nerves, which control voluntary muscle contractions. The motor neurons in the spinal cord send signals through spinal nerves to specific muscles, enabling coordinated movement and reflexes.
Recommended video:
Guided course
2:46Structure of a Skeletal Muscle Example 2
Dermatomes
Dermatomes are areas of skin innervated by sensory fibers from a single spinal nerve. They map the sensory distribution of spinal nerves on the body surface, helping to diagnose nerve damage or spinal cord injuries based on sensory loss patterns.