Image Credit: NASA. Asked by Jon Gray. An impact basin known as Valhalla is Callistoâs largest crater with a diameter of over 300 kilometres (190 miles), while concentric rings that surround it extend out to 3,000 kilometres (1,900 miles) â nearly large enough for the entire USA to fit within its boundaries.
Somewhat surprisingly, the second most common cause of tinnitus is head and neck injuries. In a clinical study of 2,400 tinnitus patients at the Oregon Health Science University, more than 12% reported that their tinnitus had been caused by head or neck injury. (1) There are two broad categories of head and neck injury, Traumatic Brain Injury (TBI) and whiplash.
Most subjective tinnitus associated with the hearing system originates in the inner ear. Damage and loss of the tiny sensory hair cells in the inner ear (that can be caused by different factors such as noise damage, medications, and age) may be commonly associated with the presence of tinnitus. One of the preventable causes of tinnitus is excessive noise exposure.