Extrafusal muscle fiber Extrafusal muscle fiber Extrafusal muscle fibers are the skeletal standard muscle fibers that are innervated by alpha motor neurons and generate tension by contracting, thereby allowing for skeletal movement. They make up the large mass of skeletal muscle tissue and are attached to bone by fibrous tissue extensions (tendons). Each alpha motor neuron and the extrafusal muscle fibers innervated by it make up a motor unit. The connection between the alpha motor neuron and the extrafusal muscle fiber is a neuromuscular junction, where the neuron's signal, the action potential, is transduced to the muscle fiber by the neurotransmitter acetylcholine. Extrafusal
A Bone for a Bone A Bone for a Bone A Bone for a Bone is a "Looney Tunes" short starring the Goofy Gophers. The cartoon, released in 1951, was directed by Friz Freleng and released by Warner Bros. Pictures, and was the first of four Goofy Gophers cartoon directed by Freleng, and would be the final work by J.B. Hardaway at the Warner Bros. studio, having returned after almost a decade at the Walter Lantz studio. The Gophers (Mac and Tosh) are playing a gin game in their hole in the ground outside a house, where Tosh loses his fifth game in a row,