Which spinal segments lack an intervertebral disc?

Which spinal segments lack an intervertebral disc?

• A. Between the occiput and the first cervical vertebra
• B. Between the first and second cervical vertebrae
• C. Both A and B
• D. None of the above

Answer: (C)

The question relates to the anatomy of the spine and specifically to the presence of intervertebral discs between specific vertebral segments. The region between the occiput (the base of the skull) and the first cervical vertebra (the atlas) indeed lacks an intervertebral disc. This area is instead connected by the atlanto-occipital joint, which allows for nodding of the head. Additionally, between the first cervical vertebra (atlas) and the second cervical vertebra (axis), there is also no intervertebral disc. Instead, this region features the atlanto-axial joint, which allows for rotational movement of the head. Both of these regions—the junction of the occiput and the atlas, as well as the junction between the atlas and the axis—are unique in their structure and function compared to the rest of the spinal column, which is characterized by intervertebral discs that provide cushioning and support. Thus, the correct answer encompasses both segments that lack intervertebral discs, confirming that both areas mentioned in the options are indeed devoid of these structures.

The question relates to the anatomy of the spine and specifically to the presence of intervertebral discs between specific vertebral segments.

The region between the occiput (the base of the skull) and the first cervical vertebra (the atlas) indeed lacks an intervertebral disc. This area is instead connected by the atlanto-occipital joint, which allows for nodding of the head.

Additionally, between the first cervical vertebra (atlas) and the second cervical vertebra (axis), there is also no intervertebral disc. Instead, this region features the atlanto-axial joint, which allows for rotational movement of the head.

Both of these regions—the junction of the occiput and the atlas, as well as the junction between the atlas and the axis—are unique in their structure and function compared to the rest of the spinal column, which is characterized by intervertebral discs that provide cushioning and support.

Thus, the correct answer encompasses both segments that lack intervertebral discs, confirming that both areas mentioned in the options are indeed devoid of these structures.