(Latin: from quatere, to shake, to strike, to beat)

To cause an injury to the brain, usually by a blow to the head or a jarring fall or jolt.
concussion (kuhn KUHSH uhn) (s) (noun), concussions (pl)
1. An injury to the brain, often resulting from a blow to the head, which can cause temporary disorientation, memory loss, or unconsciousness: The ice hockey leagues are studying changes in helmet requirements because of so many concussions that the players have been experiencing.
2. A damage to an organ of the body which is usually caused by a violent blow, a shaking or some suddenly violent jolting: The automobile accident caused several internal concussions to Mrs. Jackson and so she was unable to continue driving her car anymore.
concussion of the brain
A concussion is not a bruise to the brain caused by hitting a hard surface. In fact, no physical swelling or bleeding is usually seen on radiological scans.

Causes of some brain concussions

    A brain concussion can cause immediate and usually temporary impairment of brain function such as of thinking, vision, equilibrium and consciousness

  • Impact:
  • The concussion occurs from impact when the head accelerates rapidly and then is stopped, or from spinning when the head is spun rapidly and then is stopped.

    Impact to the brain can occur when the head slams into a hard surface.

    The skull is stopped by the hard surface but the brain, floating in cerebrospinal fluid (CSF), can still move and is shaken.

  • Spinning:
  • Spinning of the brain can occur when a blow causes the head to snap rapidly.

    The skull then stops spinning but the brain, floating in cerebrospinal fluid (CSF), can still move and is damaged.

  • Violent trauma:
  • Violent trauma, whether it be from shaking or spinning, causes the brain cells to become depolarized and fire all their neurotransmitters at once in an abrupt cascade, flooding the brain with chemicals; there is a sudden flood of ions (including sodium, potassium, and calcium, and deadening receptors in the brain that are associated with learning and memory.

A reference to a stunning, damaging, or shattering effect from a hard blow or collision; especially, a jarring injury of the brain resulting in the disturbance of a cerebral function.
1. To talk about a subject with others: "We need to discuss it with the others first."
2. To consider a topic in speaking or writing: "He wanted to discuss the procedures described in the book."
1. Someone who speaks or talks over a subject with another person or with others.
2. Anyone who examines or considers (a subject) for a speech or writing.
discussion (di SKUSH uhn) (s) (noun), discussions (pl)
1. A talk between two or more people about a subject, usually to exchange ideas or to reach a conclusion, or any talk of this kind: Just as Susan entered the kitchen, she overheard her parents having a discussion, or conversation, about where to spend their next holiday.
2. A detailed consideration or examination of a topic in writing or speech: There was a discourse or discussion in a magazine article about the best and healthiest method to lose weight.
1. Serving to disperse morbid matter; discussive; as, a discutient application.
2. An agent (as a medicinal application) which serves to disperse morbid matter.
Causing the dispersal or disappearance of a pathologic condition; such as, a tumor or a swelling.
fracas (s) (noun), fracases (pl)
1. A loud, disorderly disturbance or fight; a riotous brawl; an uproar: After a few hours, Dan's friends started a fracas as a result of too much drinking at his birthday party.
2. Etymology: from French fracas, from Italian fracasso, "uproar, crash"; from fracassare, "to smash, to crash, to break in pieces"; from fra of Latin infra, "below" + Italian cassare, "to break"; from Latin quassare, "to shake".
An uproar or noisy and disorderly quarrel.
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A brawl or uproar.
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Percussion on the body with the distal phalanx of the finger held perpendicularly to the body wall; used to determine the size of the heart, the faint percussion sound disappearing when the heart is reached even though that may be overlapped by a layer of the lung.
palpatopercussion (s) (noun), palpatopercussions (pl)
Finger touching in which the resistance of the tissues under the finger as well as the sound that comes from the area are used in aiding certain forms of medical diagnoses: The doctor used palpatopercussions by tapping on Joe’s chest, back, and abdomen during the general health check-up to determine if he was healthy enough to climb in the Alps during the summer.
palpatory percussion (s) (noun), palpatory percussions (pl)
The direct striking or tapping of the surface of a part of the body with the purpose of obtaining diagnostically relevant information by tactile or touching rather than with auditory procedures: Dr. Anderson used palpatory percussions, or finger touching, by hitting lightly on the outer layer of Jack’s stomach to hear if there were any indications of an abnormal condition.
1. To gently tap a part of a patient's body in order to diagnose an illness or condition.
2. To perform percussion by striking, for example, the thoracic or abdominal wall, thereby producing sound vibrations that aid in medical diagnosis.
1. The group of musical instruments that produce sound by being struck, including drums and cymbals, or the section of the orchestra playing such instruments.
2. The striking or detonating of a percussion cap in a firearm.
3. The impact of one object striking another, or the noise or shock created when two objects hit each other.
4. In medicine, an assessment method in which the surface of the body is struck with the fingertips to obtain sounds that can be heard or vibrations that can be felt.

It can determine the position, size, and consistency of an internal organ. It is done over the chest to determine the presence of normal air content in the lungs, and over the abdomen to evaluate air in the loops of the intestine.