Final answer:
The minor deep layer intrinsic back muscles consist of the transversospinales group, which includes semispinalis, multifidus, and rotatores, and these muscles aid in stabilizing and moving the vertebral column.
Step-by-step explanation:
Intrinsic Back Muscles
The minor deep layer intrinsic back muscles include a group known as the transversospinales. These muscles are situated beneath the erector spinae and play an essential role in stabilizing the vertebrae and allowing for precise movements of the vertebral column. The transversospinales group is made up of several smaller muscle groups such as the semispinalis, multifidus, and rotatores. These muscles originate at the transverse processes and insert at the spinous processes of the vertebrae.
Aside from the intrinsic back muscles, the transversus abdominis is a deep layer of the abdomen with muscle fibers arranged transversely. This muscle compresses the abdominal contents and supports the abdominal wall. The infraspinatus muscle, part of the rotator cuff, is responsible for the lateral rotation of the arm, and the internal intercostal muscles assist with expiration by drawing the ribs together during the respiratory cycle.