Which cranial bone is made of two masses connected horizontally by thin plates?Multiple choice question.vomerethmoid bonesphenoid bonefrontal bone

Answering the Multiple Choice Question

1. Understanding the Question: The question asks which cranial bone is characterized by being made up of two masses that are connected horizontally by thin plates.

2. Analyzing the Options:

   • Vomer: This is a singular bone forming part of the nasal septum, but it does not consist of two masses connected by plates.
   • Ethmoid Bone: The ethmoid bone is composed of two lateral masses connected by a horizontal plate (the cribriform plate).
   • Sphenoid Bone: This bone has a complex shape, including a central body with greater and lesser wings, but it does not fit the description provided.
   • Frontal Bone: This is a single bone at the front of the skull, thus does not meet the conditions of the question.

3. Conclusion: Considering the structural description provided in the question, the ethmoid bone is the cranial bone that matches the characteristics of being made of two masses connected horizontally by thin plates.

Final Answer

Ethmoid Bone