Posterior compartment of forearm muscles

This tutorial explores the superficial muscles of the back, focusing on the trapezius, latissimus dorsi, levator scapulae, rhomboids, and serratus posterior muscles. It covers their origins, insertions, actions, and innervations, as well as the bones they attach to, such as the vertebral column, scapula, and humerus. The tutorial also includes a clinical note on the triangle of auscultation, a key area for listening to lung sounds. The content is designed to help learners understand the anatomy and function of these muscles, aiding in both academic study and practical application.

Which of the following bones is NOT mentioned as a site of muscle attachment in the introduction?

• Scapula

• Femur

• Humerus

• Vertebral column

What is the primary action of the descending part of the trapezius muscle?

• Rotates the scapula

• Retracts the scapula

• Elevates the scapula

• Depresses the scapula

Which nerve is responsible for the innervation of the trapezius muscle?

• Spinal accessory nerve

• Intercostal nerve

• Thoracodorsal nerve

• Dorsal scapular nerve

The latissimus dorsi muscle is known for its role in which of the following activities?

• Breathing

• Climbing

• Running

• Shrugging

Which part of the latissimus dorsi muscle inserts more distally?

• Lateral part

• Inferior part

• Medial part

• Superior part

What is the primary function of the levator scapulae muscle?

• Depresses the scapula

• Rotates the scapula

• Retracts the scapula

• Elevates the scapula

Which nerve innervates the rhomboid muscles?

• Dorsal scapular nerve

• Thoracodorsal nerve

• Spinal accessory nerve

• Intercostal nerve

The serratus posterior superior muscle assists in which respiratory action?

• Expiration

• Inspiration

• Coughing

• Sneezing

What is the function of the serratus posterior inferior muscle?

• Rotates the scapula

• Flexes the neck

• Depresses the ribs

• Elevates the ribs

The triangle of auscultation is bordered by which of the following muscles?

• Trapezius and latissimus dorsi

• Trapezius and levator scapulae

• Rhomboid minor and serratus anterior

• Latissimus dorsi and rhomboid major