This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
CSF rhinorrhoea is due to the fracture of which of the following March 2008 
Select and explain. 
A. Nasal bones, B. Cribriform plate, C. Temporal bone, D. Maxillary bone
B: Cribriform plate
Answer: B: Cribriform plate 
Explanation: Ans. B: Cribriform Plate CSF rhinorrhoea can follow a head injury. CSF from anterior cranial fossa reaches the nose by way of cribriform plate, ethmoid air cells or frontal sinus. CSF from middle cranial fossa reaches the nose sphenoid sinuses. Sometimes, injuries of the temporal bone result in leakage of CSF into the middle ear and thence the Eustachian tube into the nose (otorhinorrhoea). The meninges are torn and cerebrospinal fluid leaks down the nose. Ascending infection may cause meningitis