Anatomy Muscle Quiz- Trunk & Abdominal

The intertransversi run from the transverse process to the adjacent transverse process. Their main function is to laterally flex the vertebrae.

The transversus abdominis is a deep muscle in the abdomen that plays a crucial role in stabilizing the core. It functions by compressing and supporting the abdominal oblique muscles. This action helps to maintain proper posture, protect the spine, and provide stability during movements such as lifting or twisting.

The external abdominal oblique muscle originates from the external surface of the ribs 5-12. This means that the muscle attaches to and originates from the outer surface of the 5th to 12th ribs.

The transversus abdominis muscle originates from the thoracolumbar fascia, costal cartilages 7-12, iliac crest, and inguinal ligament.

The internal abdominal oblique muscle originates from the thoracolumbar fascia, the lateral inguinal ligament, and the anterior iliac crest. These structures provide attachment points for the muscle, allowing it to function in the movements and support of the abdomen. The thoracolumbar fascia is a strong connective tissue that spans the lower back and provides stability to the trunk. The lateral inguinal ligament is located in the groin area and helps to support the abdominal wall. The anterior iliac crest is the front portion of the hip bone and serves as another attachment point for the muscle.

The fibers of the internal abdominal oblique run at a right angle to the external abdominal oblique. This means that they run perpendicular to the fibers of the external abdominal oblique, which is the muscle located on the outermost layer of the abdominal wall. This arrangement of fibers allows for the muscles to work together in providing support and stability to the abdominal region.

The correct answer is xiphoid process inferior ribs (costal cartilages 5-7). The rectus abdominis is a long, flat muscle that runs vertically along the front of the abdomen. It originates from the xiphoid process (a small bone at the bottom of the sternum) and inserts into the inferior ribs, specifically the costal cartilages of ribs 5-7. This muscle is responsible for flexing the trunk, compressing the abdominal contents, and stabilizing the pelvis and spine.

The insertion of the quadratus lumborum is on the twelfth rib and upper lumbar vertebrae.

The rectus abdominis muscle originates from the symphysis pubis and pubic crest. This means that it starts at the area where the two pubic bones meet and extends along the crest of the pubic bone.

The Quadratus Lumborum is a muscle located in the lower back. It has multiple actions, including fixing the 12th rib during respiration and laterally flexing the trunk to the same side. This means that when the muscle contracts, it helps to stabilize the 12th rib during breathing and also assists in bending the trunk sideways towards the same side.

The quadratus lumborum originates from the iliac crest and lower lumbar vertebrae. This muscle is located in the lower back and plays a role in stabilizing the spine and pelvis. Its attachment to the iliac crest and lumbar vertebrae allows it to exert force and control movement in this area.

The external abdominal oblique does not medially flex side to side. This muscle is responsible for compressing the abdominal viscera, flexing the trunk, and rotating the same shoulder to the opposite hip. Medial flexion side to side would involve bending the trunk towards the midline, which is not a function of the external abdominal oblique.

The internal abdominal oblique is a muscle located in the abdominal region. Its main actions include supporting the abdominal viscera (organs), flexing the trunk (bending the torso forward), and laterally flexing the torso from the same shoulder to the same hip. These actions help in maintaining posture, providing stability to the abdominal region, and assisting in movements such as bending forward and twisting the torso.

The rectus abdominis is a muscle located in the front of the abdomen. It is responsible for flexing the trunk, meaning it helps to bend the spine forward. Additionally, it compresses the abdominal fascia, which is a layer of connective tissue that surrounds the abdominal muscles. This compression helps to stabilize the core and support the abdominal organs.

The internal abdominal oblique muscle inserts into the ribs 10-12 and the rectus sheath. This means that the muscle attaches to these structures, providing support and stability to the abdominal wall. The ribs 10-12 are the lower ribs, and the rectus sheath is a layer of connective tissue that covers the rectus abdominis muscle. The insertion of the internal abdominal oblique into these structures allows it to contribute to the movements and functions of the abdominal wall.

The insertions of the transverse abdominis are the thoracolumbar fascia, costal cartilage 7-12, iliac crest, and inguinal ligament. This means that the transverse abdominis muscle attaches to these structures.

The Spinalis unilateral (thoracic and cervical) is responsible for lateral bending to the same side and rotation to the same side.

The correct answer is "rectus sheath, inguinal ligament, anterior iliac crest". The external abdominal oblique muscle inserts into the rectus sheath, which is a layer of connective tissue covering the rectus abdominis muscle. It also inserts into the inguinal ligament, which is a band of connective tissue that runs from the anterior superior iliac spine to the pubic tubercle. Additionally, it inserts into the anterior iliac crest, which is the upper curved border of the ilium bone in the pelvis. These insertions allow the external abdominal oblique muscle to contribute to the movement and stability of the trunk and pelvis.