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
Bertram A. Bone floating reserve force, and Bone did not see combat. Colonel Bone was appointed officer in Charge of the Ordnance Section, Service Command Fleet Marine Force, Pacific under Major General Earl C. Long. In this capacity, Bone was co-responsible for the supply, salvage, evacuation, construction, personnel management, quartering and sanitation needs of all FMFPac units and other marine units in its area. He was ordered back to the States in May 1946 and following the brief leave home, he was appointed commanding officer of the Recruit Depot within Marine Corps Base San Diego under Major General Leo D. Hermle. In this