Temporomandibular joint

The temporomandibular joint is the joint of the jaw and is frequently referred to as TMJ. The TMJ is a bilateral synovial articulation between the mandible and temporal bone. The name of the joint is derived from the two bones which form the joint: the upper temporal bone which is part of the cranium (skull), and the lower jawbone or mandible.

Structure

There are six main components of the TMJ.

Capsule and articular disc

The capsule is a dense fibrous membrane that surrounds the joint and incorporates the articular eminence. It attaches to the articular eminence, the articular disc and the neck of the mandibular condyle.

The unique feature of the TMJs is the articular disc. The disc is composed of fibrocartilagenous tissue that is positioned between the two bones that form the joint. The TMJs are one of the few synovial joints in the human body with an articular disc, another being the sternoclavicular joint. The disc divides each joint into two.These two compartments are synovial cavities, which consists of an upper and a lower synovial cavity. The synovial membrane lining the joint capsule produces the synovial fluid that fills these cavities.

WTMJ-TV

WTMJ-TV, virtual channel 4 (UHF digital channel 28), is an NBC-affiliated television station located in Milwaukee, Wisconsin, United States. The station is owned by the E. W. Scripps Company. WTMJ-TV maintains studio facilities located on Capitol Drive (Wisconsin Highway 190) in Milwaukee (an Art Deco facility that is known as "Radio City", in tribute to the New York complex of the same name), and its transmitter is located approximately 4 miles (6.4 km) north of downtown Milwaukee.

History

Journal Communications ownership

The Journal Company (owner of the Milwaukee Journal, which was consolidated with the Milwaukee Sentinel in 1995 to become the Milwaukee Journal Sentinel) was granted its first television station license in September 1931 for W9XD. The experimental station used a low-definition electromechanical system to transmit its signal, and conducted field tests from 1931 to 1933; in 1934, Journal converted W9XD's facilities to experimental high-fidelity apex radio unit W9XAZ in 1934. Its license was withdrawn by the Federal Communications Commission (FCC) in 1938 as part of an effort to limit broadcast licenses to stations that would actively engage in the development of television. No publicly announced television programming was broadcast by W9XD during this experimental period.