Final answer:
The intermediate intrinsic back muscles include the multifidus and segmental muscles such as the interspinales and intertransversarii, which stabilize and move the vertebral column. The abdominal wall is made up of the rectus abdominis, external oblique, internal oblique, and transversus abdominis, while the intercostal muscles in the thorax assist in respiration.
Step-by-step explanation:
The intermediate intrinsic back muscles are a group of muscles located deep within the back, beneath the superficial layers, and they play a crucial role in the stabilization and movement of the vertebral column. These include muscles such as the multifidus, which helps in extending and laterally flexing the vertebral column, and the segmental muscles, including the interspinales and intertransversarii, which bring together the spinous and transverse processes of each consecutive vertebra. Additionally, the abdominal wall consists of several layers of muscle which include the rectus abdominis, external oblique, internal oblique, and transversus abdominis.
The thorax contains the intercostal muscles, which draw the ribs together and are essential for respiration. The internal and innermost intercostal muscles contract to decrease the thoracic cavity's volume during exhalation. Conversely, during inhalation, muscles such as the scalene muscles (anterior, middle, and posterior) are involved in deep breathing by elevating the first two ribs, thus expanding the thoracic cavity.The intermediate intrinsic back muscles are a group of muscles located in the back that help with movement and stability of the spine. These muscles include the multifidus, interspinales, and intertransversarii muscles. The multifidus muscle is found in the lumbar region and helps extend and laterally flex the vertebral column. The interspinales and intertransversarii muscles bring together the spinous and transverse processes of each consecutive vertebra.