Muscles of the trunk

This tutorial covers the muscles of the trunk wall, focusing on both thoracic and abdominal regions. It details the intercostal, transversus thoracis, subcostal, scalene, and subclavius muscles, explaining their roles in respiration and stabilization. The abdominal wall muscles, including the external and internal obliques and rectus abdominis, are discussed in terms of their functions in movement and pressure maintenance. The back and posterior abdominal muscles, such as the trapezius, rhomboid, and quadratus lumborum, are explored for their roles in stabilization and movement. Finally, the intrinsic back muscles are examined for their contributions to spinal movement and support.

Which muscles are responsible for raising the ribs during inhalation?

• Subcostal muscles

• Transversus thoracis

• External intercostal muscles

• Internal intercostal muscles

What is the primary function of the transversus thoracis muscle?

• To rotate the trunk

• To elevate the ribs

• To lower the ribs

• To stabilize the scapula

Which muscle is known for its role in forming a 'six-pack'?

• Transversus abdominis

• External oblique

• Rectus abdominis

• Internal oblique

What is the function of the pyramidalis muscle in humans?

• To tense the linea alba

• To elevate the ribs

• To flex the lumbar spine

• To rotate the trunk

Which muscle is responsible for the adduction and elevation of the scapula?

• Levator scapulae

• Latissimus dorsi

• Trapezius

• Rhomboid muscles

What is the role of the quadratus lumborum during expiration?

• To flex the trunk

• To rotate the spine

• To fix the 12th rib

• To elevate the ribs

Which muscle group is involved in the lateral flexion of the spine?

• Iliocostalis

• Longissimus

• Splenius

• Intertransversarii

What is the primary function of the multifidus muscle?

• To flex the spine

• To rotate the spine

• To stabilize the scapula

• To extend the spine

Which muscle is part of the spinal transverse system?

• Iliocostalis

• Splenius

• Levatores costarum

• Interspinales

What is the main takeaway from the tutorial on trunk muscles?

• Understanding trunk muscles is crucial for respiration and movement.

• Trunk muscles are only important for posture.

• Trunk muscles are primarily for aesthetic purposes.

• Trunk muscles have no significant function.