Question

What is the term for a muscle fiber in the skeletal muscle that lies outside muscle spindles and receives innervation from alpha motor neurons?

Answer 1

An extrafusal muscle fiber is a muscle fiber in the skeletal muscle that lies outside muscle spindles and receives innervation from alpha motor neurons.

Step-by-step explanation:

A muscle fiber in the skeletal muscle that lies outside muscle spindles and receives innervation from alpha motor neurons is called an extrafusal muscle fiber.

Extrafusal muscle fibers are responsible for generating the force needed for muscle contraction. They make up the majority of the muscle and are innervated by alpha motor neurons. In contrast, intrafusal muscle fibers are located within muscle spindles and are responsible for providing sensory information about muscle length and stretch.