Multiple Choice
Which part of the neuron is primarily found in the white matter of the central nervous system?
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12. The Central Nervous System
Introduction to the Central Nervous System
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which structure marks the most superior boundary of the spinal cord?
A
Cervical enlargement
B
Medulla oblongata
C
Conus medullaris
D
Foramen magnum
Verified step by step guidance1
Step 1: Understand the anatomy of the spinal cord and its boundaries. The spinal cord is a cylindrical structure that extends from the brainstem to the lower back. It is protected by the vertebral column and surrounded by meninges.
Step 2: Identify the superior boundary of the spinal cord. The spinal cord begins at the foramen magnum, which is the large opening at the base of the skull where the brainstem transitions into the spinal cord.
Step 3: Clarify the role of the medulla oblongata. The medulla oblongata is part of the brainstem and lies just above the foramen magnum. It is not part of the spinal cord but connects to it at the foramen magnum.
Step 4: Differentiate between other structures mentioned. The cervical enlargement is a widened area of the spinal cord that provides nerves to the upper limbs, and the conus medullaris is the tapered end of the spinal cord located near the lower back. Neither of these structures marks the superior boundary.
Step 5: Conclude that the foramen magnum is the correct answer because it is the anatomical landmark where the spinal cord begins and marks its most superior boundary.
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