Functional Anatomy Of The Trunk Trivia Quiz

When the patient is sitting in a neutral position and leans back to grab the object, their abdominals are working eccentrically. Eccentric muscle contractions occur when the muscle lengthens while generating force, as opposed to concentric contractions where the muscle shortens while generating force. In this scenario, the abdominals are lengthening as the patient leans back to reach the object, while still actively contracting to control the movement and prevent falling.

Subtle postural shifts can indeed have a significant impact on muscle activity. Even small adjustments in posture can alter the distribution of forces and load on different muscles, leading to changes in muscle activation patterns. This means that even slight changes in body position can result in different muscles being engaged or disengaged. Therefore, it is accurate to say that subtle postural shifts can completely change muscle activity.

In this scenario, your abdominals are working concentrically. This means that they are contracting and shortening in order to bring your torso forward and allow you to grab the remote.

Patients who are weak or posturally insecure, freezing their degrees of freedom, or spastic will have trouble dissociating their muscle actions. This means that they will have difficulty in coordinating and controlling their muscle movements, leading to impaired motor function.

When acting unilaterally, internal obliques turn the vertebral column to the same side. The external obliques, when working unilaterally, turn the vertebral column to the OPPOSITE side.

When the shoulders are behind the hips, it creates a posterior pelvic tilt, which activates the abdominal muscles. This position helps to stabilize the spine and maintain proper alignment. The abdominals have to work harder to prevent the hips from tilting forward and to maintain a neutral spine. On the other hand, when the shoulders are in front of the hips, it creates an anterior pelvic tilt, which lengthens and relaxes the abdominal muscles. This position can lead to poor posture and decreased abdominal activation.

The normal range of motion of the cervical portion of the spine includes flexion of 40 degrees, extension of 75 degrees, lateral flexion of 35-45 degrees, and rotation of 45-50 degrees. This means that the neck can bend forward and backward, tilt to the sides, and rotate to some extent within these ranges.

The normal range of motion of the thoracic portion of the spine includes flexion of 105 degrees, extension of 60 degrees, lateral flexion of 20 degrees, and rotation of 35 degrees.

The normal range of motion of the total spine includes flexion, extension, lateral flexion, and rotation. Flexion refers to the forward bending of the spine, while extension refers to the backward bending. Lateral flexion refers to the side bending of the spine, and rotation refers to the twisting movement. The correct answer states that the normal range of motion for flexion is 140 degrees, for extension is 140 degrees, for lateral flexion is 75-85 degrees, and for rotation is 90 degrees.

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The purpose of the abdominal wall and lateral trunk is to support the viscera, assist in respiration, and provide trunk control, including lateral flexion, rotation, and posterior movement (leaning back). These functions help maintain the balance of the vertebral column and pull the pelvis into an anterior tilt. Additionally, they accentuate lumbar lordosis, contributing to the overall stability and mobility of the trunk.