Sphenoid sinus drains into which of the following
Spheno-ethmoidal recess
Middle meatus
Superior meatus
Hiatus semilunaris
The right and left sphenoidal air sinuses lie within the body of sphenoid bone. They are separated by a septum. The two sinuses are usually unequal in size Each sinus opens into the sphenomandibular recess of corresponding half of the nasal cavity. Ref BDC volme3,6th edition pg 246
Head and neck