Intertubercular groove muscles

The video tutorial covers the intertubercular groove muscles, focusing on the pectoralis major, teres major, and latissimus dorsi. It explains their origins, insertions, and actions on the glenohumeral joint, such as adduction and extension. The tutorial also highlights the innervation of the latissimus dorsi via the thoracodorsal nerve, emphasizing its clinical relevance.

Which muscle is primarily responsible for horizontal adduction of the glenohumeral joint?

• Pectoralis major

• Deltoid

• Latissimus dorsi

• Teres major

What is the origin of the teres major muscle?

• Medial third of the clavicle

• Inferior margin of the scapula

• T7 to the sacrum

• Lateral lip of the intertubercular groove

Which muscle assists in both adduction and extension of the glenohumeral joint?

• Teres major

• Latissimus dorsi

• Biceps brachii

• Pectoralis major

The thoracodorsal nerve is responsible for innervating which muscle?

• Subscapularis

• Latissimus dorsi

• Teres major

• Pectoralis major

Which spinal nerve levels contribute to the innervation of the latissimus dorsi?

• C6, C7, C8

• C8, T1, T2

• C5, C6, C7

• C7, C8, T1