<prompt> Prussaks space is related to -MesotympanumEpitympanumHypotympanumInner ear  <response>: Ans. is B i.e., Epitympanum o The middle ear lies between the tympanic membrane laterally and the cochlea medially. The middle ear tympanic cavity is divided into Mesotympanum tympanic cavity proper It is the narrowest part of tympanic cavity transverse dimension is 2 mm. It lies opposite to pars tensa. Epitympamim attic It is the part of tympanic cavity which extends above the tympanic membrane pars tensa and lies opposite medial to shrapnels membrane pars flacida and bony lateral attic wall. It is the widest part of tympanic cavity transverse dimension is 6 mm. Epitympanum attic communicates with mastoid air cell system, through a small opening called aditus. Prussaks space communicates with epitympanum through a posterior gap. Attic area epitympanum is a crowded place and only a thin plat of bone tegmen separates this region from middle cranial fossa. Any infection in this area is prone to affect the temporal lobe of brain through erosion of this plate. Infections and inflammations in this area are considered to be unsafe due to impending intracranial complications. C Hypotympanuni It is the part of the tympanic cavity which extends below the pars tensa. Its transverse dimension is 4 mm. o Sometimes the portion of middle ear around the tympanic orifice of the eustachian tube is called as protympanum. 