What is the shape of the rhombencephalon?

What is the shape of the rhombencephalon?

• A. Oval
• B. Cylindrical
• C. Diamond shaped
• D. Spherical

Answer: (C)

The hindbrain is named for its appearance in early development—the embryonic hindbrain forms as a rhomboid, or diamond-shaped, vesicle. The term rhombencephalon literally points to this diamond outline seen when the neural tube grows into its primary vesicles between the forebrain and the spinal cord. That diamond shape helps students remember that this region will later give rise to structures like the metencephalon and myelencephalon. In contrast, this stage of development isn’t characterized by a simple oval, cylindrical, or spherical form, so those shapes don’t fit as well with how the hindbrain develops.

The hindbrain is named for its appearance in early development—the embryonic hindbrain forms as a rhomboid, or diamond-shaped, vesicle. The term rhombencephalon literally points to this diamond outline seen when the neural tube grows into its primary vesicles between the forebrain and the spinal cord. That diamond shape helps students remember that this region will later give rise to structures like the metencephalon and myelencephalon. In contrast, this stage of development isn’t characterized by a simple oval, cylindrical, or spherical form, so those shapes don’t fit as well with how the hindbrain develops.