The strings correspond to which muscle groups that perform flexion?

The strings correspond to which muscle groups that perform flexion?

• A. Hypaxial
• B. Epaxial
• C. Axial muscles
• D. Appendicular muscles

Answer: (A)

Flexion of the trunk is produced by the ventral, or hypaxial, muscle group. These muscles lie anterior to the vertebral column and include the abdominal wall muscles that pull the ribcage and pelvis closer together, bending the trunk forward. Epaxial muscles sit along the back and mainly extend and stabilize the spine; while they can contribute to some lateral movement, their primary role is extension, not flexion. Axial muscles is a broad category that includes both hypaxial and epaxial components, so it doesn’t pinpoint the flexors. Appendicular muscles govern limb movements, not trunk flexion. So the strings correspond to the hypaxial muscles.

Flexion of the trunk is produced by the ventral, or hypaxial, muscle group. These muscles lie anterior to the vertebral column and include the abdominal wall muscles that pull the ribcage and pelvis closer together, bending the trunk forward. Epaxial muscles sit along the back and mainly extend and stabilize the spine; while they can contribute to some lateral movement, their primary role is extension, not flexion. Axial muscles is a broad category that includes both hypaxial and epaxial components, so it doesn’t pinpoint the flexors. Appendicular muscles govern limb movements, not trunk flexion. So the strings correspond to the hypaxial muscles.