Questions and Answers
Which laminae correspond to the Rexed Laminae Posterior/Dorsal Horn?
What does Lamina VII include?
What is Lamina I known as?
Marginal nucleus of spinal cord or posteromarginal nucleus
What is the primary role of Lamina II?
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What is the significance of Lamina V?
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What is Lamina VI's primary function?
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Match the following Rexed Laminae with their corresponding functions:
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What are the primary cells found in Lamina X?
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What does Lamina IX control?
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Study Notes
Rexed Laminae Overview
- Rexed laminae are regions in the spinal cord categorized by distinct types of neurons and their functions.
- Laminae are numbered I-X and are organized into dorsal, intermediate, and ventral horns.
Posterior/Dorsal Horn (Lamina I-VI)
- Lamina I: Contains the marginal nucleus; involved in processing pain, temperature, and touch sensations.
- Lamina II: Known as the substantia gelatinosa; releases substance P and glutamate, and processes pain-related information.
- Lamina III/IV: Nucleus proprius; involved in proprioception, two-point discrimination, and vibration sensation.
- Lamina V: The neck of the dorsal horn; participates in processing visceral stimuli and contributes to voluntary motor control.
- Lamina VI: Base of the dorsal horn; responsible for proprioceptive input from muscle spindle and joint afferents, present in cervical and lumbar regions.
Intermediate Zone (Lamina VII and X)
- Lamina VII: Contains the intermediomedial nucleus and nucleus dorsalis of Clarke; processes sensory information from lower extremities and contains sympathetic/parasympathetic preganglionic fibers, spanning C8-L4.
- Lamina X: Central gray matter surrounding the central canal; predominantly made up of interneurons.
Anterior/Ventral Horn (Lamina VIII-IX)
- Lamina VIII: Part of the medial ventral horn; involved in modulation of flexor and extensor muscles for posture and balance control.
- Lamina IX: Divided into lateral and central parts; lateral section sends descending motor signals to skeletal muscles of limbs, while the central part deals with muscles related to respiration.
Additional Notes
- Laminae I-VI are primarily sensory regions, contributing to the perception of various sensory modalities.
- Laminae VII-IX play critical roles in motor control and autonomic functions.
- Lamina X functions to integrate and relay information within the spinal cord, influencing reflexes and central pattern generators.
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Description
This quiz focuses on the anatomy of the Rexed Laminae within the spinal cord. It presents flashcards that detail the various laminas, including their nuclei and functions. Perfect for students studying neuroanatomy or related fields.
