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
The Marrow of a Bone The Marrow of a Bone The Marrow of a Bone (stylized THE MARROW OF A BONE) is the sixth studio album by Japanese metal band Dir En Grey, released on February 7, 2007, in Japan, and in the United States (20 February), Germany (2 March), France (6 March), and the United Kingdom (7 May) in the following months. In total, the album was released in eleven countries. The band was touring North America at the time of the album's release in both Japan and the United States. In March 2007, "The Marrow of a Bone" reached number 21 on "Billboard's"