BACKGROUND A classic sign of canine syringomyelia (SM) is scratching towards one shoulder. Using magnetic resonance imaging (MRI) we investigate the spinal cord lesion relating to this phenomenon which has characteristics similar to fictive scratch secondary to spinal cord transection. Medical records were searched for Cavalier King Charles spaniels with a clinical and MRI diagnosis of symptoma...

The neuromuscular control of vocalization in birds requires complicated and precisely coordinated motor control of the vocal organ (i.e. the syrinx), the respiratory system and upper vocal tract. The biomechanics of the syrinx is very complex and not well understood. In this paper, we aim to unravel the contribution of different control parameters in the coo of the ring dove (Streptopelia risor...

The stereotypical vocal patterns of adult male zebra finches (Poephila guttata) were examined before and after elimination of auditory feedback and/or feedback from the vocal organ (the syrinx). Elimination of auditory feedback was accomplished via bilateral removal of the cochleae, whereas feedback from the syrinx was eliminated by cutting hypoglossal afferent fibers while leaving hypoglossal ...

The prevalence of symptomatic syringomyelia in patients with chronic spinal cord injury (SCI) is around 4.5%. It is an important cause of treatable neurologic deterioration, although surgical shunting of the syrinx or arachnoid adhesiolysis of tethered elements have unpredictable results. Classically, syrinx extension causes progressive neuropathic pain, often with dissociated sensory loss due ...

In this thesis, the physics of birds phonation is discussed using a two-mass models approach and the theory of nonlinear dynamics. Two-mass models of the human larynx (rescaled two-mass model and trapezoidal model) have been adapted to the dimension of the avian syrinx to study pressure onset, control of harmonic overtones and “registers” of the sound radiated by the birds vocal organ (syrinx) ...

Five patients with syringomyelia were examined with a 3.5 kG nuclear magnetic resonance (NMR) imager. Syrinx cavities were visualized in all five cases, and image quality compared favorably with metrizamide computed tomography (CT). Axial images were optimal for identifying syrinx cavities, and sagittal views were useful in providing an overview of cord morphology and in examining the craniocer...

explain the pathophysiology of syringomyelia associated with the Chiari I malformation. In some of them, mechanisms in which the syrinx expands progressively from an initially small locus of syringomyelia, a “drop” of fluid, to a cavity that is large enough to distend the spinal cord are proposed. This is the mechanism proposed for the theories advocated by Gardner and Angel,4,5 and Williams18–...

The principal physical mechanism of sound generation is similar in songbirds and humans, despite large differences in their vocal organs. Whereas vocal fold dynamics in the human larynx are well characterized, the vibratory behaviour of the sound-generating labia in the songbird vocal organ, the syrinx, is unknown. We present the first high-speed video records of the intact syrinx during induce...

Spinal cord injury is an uncommon complication of post epidural lumbar anesthesia with acute and delayed progressive neurological complications described. Few cases of post spinal anaesthesia syrinx formation have been reported in literature. We report an interesting case of focal myelomalacia with syrinx formation occurring post lumbar anesthesia in a thity five year old female undergoing open...