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 when Geo P. Dog digs a hole and dumps a bone on the Gophers and then dirt as he fills the hole in. Geo does remove the bone upon Tosh's request, but realizing that it was gophers who asked him to move the bone, he returns to the same hole to rebury the bone. This time, Mac goes up, only to be grabbed by Geo. Mac then yells for help, which arrives in the form of Tosh and a hammer, which Tosh uses to knock Geo's head into his collar, allowing the Gophers to return to their hole and escape