The somatotopic representation of the micturition pathways in the cervical cord of man

Bladder function has been studied in a group of patients submitted to open and percutaneous high cervical cordotomy. It is concluded that the vesicomotor pathway lies within 3 mm of the cord surface in the region of the dentate ligament. Vesicosensory pathways probably lie in the posterior columns. The investigation supports the thesis that visceral frtnctions such as respiration and micturition are associated with appropriate somatic innervation.

Extracranial skeletal metastases from an intracranial meningeal chondrosarcoma. Case report

✓ This report describes a meningeal chondrosarcoma over the convexity of the brain with extracranial metastases to the left femur and pelvis.

Metastases of glioblastoma multiforme to cervical lymph nodes. Report of two cases

✓ Two cases of occipital glioblastoma multiforme are reported in which a metastatic lesion involving the cervical lymph nodes on the side of the previous craniotomy was verified during life. This suggests to the authors that the brain tumor metastasized via lymphatic channels.

Compressive Fatigue Coaxing in Composites

Compressive fatigue experiments on unidirectional fiber reinforced composites, of both fiberglass and graphite fiber, reveal that compressive fatigue damage takes place by crack extension directly transverse to the fibers. It is also found that specimens which are first subjected to a few hundred thousand cycles of compressive fatigue at low stress levels, and then subjected to compressive fatigue at high stress levels, will survive longer at high stress levels than specimens which are placed under high compressive fatigue stresses from the outset. The increase of fatigue life at high compressive stress levels can be quite large; increases of fatigue life by as much as a factor of five were observed. The phenomenon of prolonging fatigue life at high stress levels by first "running in" a specimen at low stress levels is called coaxing, and is directly opposite to the often reported cumulative damage phenomena observed in tensile fatigue of composites. A possible mechanism for coaxing in compressive fatigue of composites is offered, and practical applications of the effect are suggested.