NETA Personal Trainer Practice Exam

The erector spinae is made up of which three muscle subdivisions?

1. Trapezius, Rhomboids, and Serratus

2. Longissimus, Spinalis, and Iliocostalis

3. Latissimus Dorsi, Gluteus Medius, and Quadratus Lumborum

4. Semispinalis, Multifidus, and Rotatores

The correct answer is: Longissimus, Spinalis, and Iliocostalis

The erector spinae is a group of muscles that play a crucial role in supporting the spine and maintaining an upright posture. It is composed of three main subdivisions: Longissimus, Spinalis, and Iliocostalis. Longissimus runs along the length of the spine and is responsible for extending and laterally flexing the vertebral column. Spinalis is the most medial part of the erector spinae group and primarily aids in spinal extension. Iliocostalis, the most lateral subdivision, also contributes to the extension of the back and helps with lateral flexion. Together, these subdivisions allow for a range of movements including bending backward, side bending, and maintaining stability during various activities. Each muscle within the erector spinae is vital for back health, and understanding their roles helps in designing effective strength and conditioning programs for clients.