Cibriform plate is also known as:
**Core Concept**
The cribriform plate is a part of the ethmoid bone in the skull, forming the roof of the nasal cavity. It contains numerous small foramina (openings) through which the olfactory nerves pass, connecting the nasal mucosa to the olfactory bulb in the brain.
**Why the Correct Answer is Right**
The cribriform plate is a critical structure in the transmission of olfactory information from the nose to the brain. The olfactory receptors in the nasal mucosa detect odor molecules, which then bind to olfactory receptors on the surface of the olfactory sensory neurons. These neurons transmit signals through the cribriform plate to the olfactory bulb, where they are processed and interpreted.
**Why Each Wrong Option is Incorrect**
**Option A:** The perpendicular plate of the ethmoid bone does not have foramina for the olfactory nerves, making it an incorrect option.
**Option B:** The orbital plate of the ethmoid bone forms part of the orbital floor, but it is not associated with the olfactory nerves.
**Option C:** The sphenoid bone is a separate cranial bone that forms part of the base of the skull, but it does not contain the cribriform plate.
**Clinical Pearl / High-Yield Fact**
It is essential to recognize the location and function of the cribriform plate, especially in the context of traumatic injuries to the face or head. A fracture of the cribriform plate can lead to damage to the olfactory nerves, resulting in anosmia (loss of smell).
**Correct Answer: C. Lamina cribrosa.**