In a blast injury, which of the following organ is least vulnerable to the blast wave -

• Primary blast injuries result from the rapid overpressure or shock waves produced by an explosion • These injuries result from the dramatic changes in barometric pressure projected from the point of detonation • Primary blast injuries predominantly cause damage to air filled hollow organs of the body from rapid pressure change (barotraumas).\ • Damage to air filled organs includes middle ear, lungs and GIT. • Most sensitive and most frequently injured hollow organ: Tympanic membrane > Lungs • Blast damage to the lungs is the MC cause of life threatening injury following an explosion.