type of Head injury: occurs on the opposite side of the brain from the site of impact. aCoup injury bcontrecoup injury cskull fracture dICP

A traumatic brain injury (TBI) is a form of brain injury caused by an external physical force.  In addition to direct injury at the site of an impact, the rapid acceleration-deceleration of the head may cause the brain to move within the skull and result in injury to the part of the brain opposite the impact site.  This is known as a contrecoup injury.If an impact to the head also results in a skull fracture, the injury is classified as an open TBI.  If there is no skull fracture, the injury is classified as a closed TBI.  The type of TBI can be predicted from the collision duration and the average acceleration of the head.  The thresholds for open and closed TBI are shown in Figure 1.Figure 1  Thresholds for open and closed TBIIn an experiment to study head collisions with projectiles, researchers equipped the head of a crash test dummy with sensors that measured acceleration on multiple axes.  The crash test dummy was stationary before its head was subjected to controlled collisions with incoming projectiles of varying mass and impact velocity.  The linear acceleration of the crash test dummy's head was recorded during and after the impact.  The results for a trial in which the impact lasted for 10 ms are shown in Figure 2.Figure 2  The acceleration of the head during and after a 10-ms collision Question 4A baseball traveling at 20 m/s strikes a player running at 5 m/s.  The relative speed of the ball with respect to the player depends on the direction of travel of the ball relative to the player's direction of travel.  What is the difference between the minimum and maximum possible speeds of the ball relative to the player?A.10 m/sB.15 m/sC.20 m/sD.25 m/s

describe common mechanisms that contribute to extracranial and intracranial traumatic brain injuries, including intracranial hematomas.

Describe what happens in the brain when a traumatic brain injury occurs.

An injury that breaks in the continuity of the bone. It usually occurs as a result of high impact forces that cause that bone to bend or twist.*concussionsprainfracturedislocation

Item6Item 6A baseball player was hit on the left side of his skull in the parotid area. He cannot close his eye and the corner of his mouth droops. Which cranial nerve was damaged?Multiple ChoiceFacialGlossopharyngealAccessoryOpticOculomotor