Peter H Abrahams

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Twenty-four hours after nerve crush, the Schwann cell plasma membrane and subjacent outer layer of Schwann cell cytoplasm were examined by freeze-fracture in myelinated fibres from the rat and rabbit sciatic nerves. The irregular circumferential bands and longitudinal columns of cytoplasm which characterise the surface of the normal Schwann cell were(More)
In bilateral dissections of 68 cadavers, four examples were found unilaterally of variant slips of iliacus and psoas major muscles. In three of them the femoral nerve was pierced by the variant slip. One of these variants was a previously undocumented accessory slip of iliacus, originating from the iliolumbar ligament, passing inferiorly anterior to(More)
It would be valuable to use cadaveric models of cervical vertebrae and spinal cord to assess how varying degrees of traumatic subluxation would relate to neurological damage. However, before such a study may be undertaken, it would be important to assess the degree of shrinkage of expansion of the spinal cord that occurs during the embalming process. This(More)
Integral group actions on symmetric spaces and discrete duality symmetries of supergravity theories, Abstract simplicity of complete Kac–Moody groups over finite fields, Conjecture on the structure of fundamental domains for nonuniform lattices in Kac–Moody groups, Discrete, interactive and algorithmic mathematics, algebra and number theory meets geometry(More)
Recent theories about migraine pathogenesis have emphatized the role of the trigeminal system in the pathogenesis of migraine attacks. The local vasodilatation of intracranial extracerebral blood vessels and the consequent stimulation of surrounding trigeminal sensory nerve pain pathways are proposed to be the key mechanisms underlying the generation of(More)
This anatomic study describes the course and intracranial relations of the hypoglossal n. in 32 cadavers. The rootlets of the nerve emerged as a fan-shaped distribution (23.44%) or in two bundles (76.56%) and converged towards the hypoglossal canal in the subarachnoid space before piercing the duramater. In 76.57% of cases the rootlets pierced the dura(More)
This case report represents the finding of an abnormal atlas vertebra during dissection of 34 cadavers. The case which we describe appeared to have an atlas with a mass at a position similar to that of a centrum. This mass may have been a developmental abnormality of the centrum of the atlas or may have represented a congenital abnormality, known as the os(More)
When administered to intact adult male rats, cyproterone acetate (10 mg/day), flutamide (15 mg/day), or Compound I (1 mg/day) caused a significant decrease in the organ weight to body weight ratios, with a concomitant rise in the specific activity of prostatic acid phosphatase. These compounds do not affect two other markers of androgen activity in the(More)
Using the freeze-fracture technique, myelinated fibres were examined from the rabbit sciatic nerve at 48 h after a proximal nerve crush. Employing computer-aided morphometric techniques the distribution of Schwann cell plasma membrane pores was analysed. In both normal control and crushed nerves membrane pores were restricted to the cytoplasmic(More)