Scutum is
The lateral wall of the middle ear is formed largely by the tympanic membrane and to a lesser extent by the bony outer attic wall called the scutum.Refer: PL Dhingra, Diseases of Ear, Nose & Throat, 7th edition, pg no. 6
Bony pa of outer attic wall
Bony pa of inner attic wall
Cailaginous pa of outer attic wall
Cailagenous pa of inner attic wall
Ear