Section 1: This section, just inferior to the tegmen tympani (i.e., roof of middle ear space), passes through the epitympanic recess where the head of the malleus (m) and body of the incus (i) are located. The superior semicircular canal (ssc) has been cut in two places.
The scutum (sc) is the lateral wall of the epitympanum and is a "shield"-like contribution of the squamous portion of the temporal bone to the osseous external auditory meatus (EAM). The aditis ad antrum (aaa) is the passageway from the epitympanum to the mastoid antrum and is just inferior to the tegmen.