The Surgery of the Skull and BrainRawling, Louis Bathe
Science
The Surgery of the Skull and Brain
Rawling, Louis Bathe
Brain -- Surgery; Skull -- Surgery
=The localizing symptoms of traumatic epilepsy.= When the cause of the
trouble is situated over the motor area--the pre-Rolandic cortical
strip--the fits should commence by twitchings of the fingers, toes,
corners of the mouth, &c., according to the site of the lesion. The fits
are seldom preceded by any sensory auræ, though occasionally such may be
the case, for even at the present day some doubt exists as to whether
the precentral area should be regarded as purely motor or sensori-motor.
In other cases, the patient, without being able to state definitely his
sensations previous to the onset of the fit, may be able to foretell its
immediate development, and still more rarely he may be capable of
aborting the fit or diminishing its intensity by grasping firmly or
massaging the region of the body in which the fit first develops.
When Broca’s motor speech-area is primarily involved, the fits are
preceded by difficulty in phonation, mumbling of words and incoherence,
grinding of the teeth, &c., the fits then rapidly spreading to the parts
responsible for the movements of the muscles of face and upper
extremity.
When the fits arise from a post-central source of irritation, they are
usually preceded by well-marked sensory auræ--tinglings, burning and
painful sensations--again according to the region affected.
When preceded by sensations of taste and smell, the lesion is probably
situated over the anterior part of the temporo-sphenoidal lobe.
When by visual impressions--flashes of light, &c.--the lesion is
probably situated over the occipital lobe of the brain.
=Pathology.= The pathological conditions responsible for the development
of fits are various, resolving themselves, when fully investigated, into
two main groups: those associated with meningeal changes only, and those
accompanied by definite cortical scarring and tract degeneration.
In the event of osseous deficiency the scalp is usually more or less
adherent to underlying structures, and the gap in the skull filled with
dense fibrous tissue, which is itself adherent to the membranes of the
brain and perhaps to the brain itself.
In the absence of osseous deficiency, the cerebral irritation is usually
dependent on depressed fragments of bone, on subdural hæmatomata and
cysts, and on meningeal thickening.
In the event of cerebral degenerative changes it may be presumed,
whether there is a deficiency in the bone or not, that considerable
matting of meninges and cortex is existent with pyramidal degeneration.
Public-domain text, read in full here on John Shaqi.
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