No abstract

This case report describes abnormalities in bilateral rectus capitis posterior minor muscles in one individual with persistent head and neck pain. These findings are muscle atrophy, fatty infiltration on magnetic resonance imaging, and electromyographic abnormalities compatible with denervated muscle. The objective of the study contained herein was to determine if fatty infiltration on magnetic resonance imaging of the rectus capitis posterior minor muscle is the result of disuse or denervation. Electromyography and magnetic resonance imaging data were collected from normal and atrophied muscles. Electromyography and magnetic resonance imaging abnormalities compatible with denervation atrophy were detected. Although we cannot rule out aging or other unknown causes, we suspect that denervation is caused by nerve damage from trauma to the C1 dorsal ramus as a consequence of entrapment within the rectus capitis posterior major muscle.

The optical constants of nine compounds of NiAl ranging in composition from 45.2 at.% Ni to 61.6 at.% Ni have been determined between 0.212 and 1.80 μ. Measurements of the ratio of the reflectance of light polarized parallel to the plane of incidence to the reflectance of light polarized perpendicular to the plane of incidence were made at the following five angles of incidence: 55°, 60°, 65°, 70°, 75°. Data were analyzed by a computerized interation technique to provide values of the high-frequency dielectric constants and the electrical conductivity. Since the measurements were made on mechanically polished surfaces, two annealing experiments were performed to ascertain the effects of surface disturbance; the results showed that the optical properties were essentially unaffected by the annealing treatments. Plots of 2nk show absorption bands at ≈1.5 to 2, 2.5, 4.0, and 5.1 eV and what may be interpreted as free-electron behavior below 1.5 eV. The energy-band structure shows a strong compositional dependence which has been interpreted to be the result of contact between the Fermi surface and a Brillouin-zone boundary.

In magnetic resonance images of the median nerve at the carpal tunnel, swelling and T2 increases from baseline are a normal response to typing and may be less likely to occur in subjects with symptoms of carpal tunnel syndrome.