Muscles of medial wall of axilla

Question 1

Serratus anterior

Answer 1

Origin:

• Lateral surfaces of upper 8-9 ribs and deep fascia overlying the related intercostal spaces

Insertion:

• Costal surfaces of medial border of scapula

Innervation:

• Long thoracic nerve (C5, C6, C7)

Function:

• Protraction and rotation of the scapula;
• Keeps medial border and inferior angle of scapula opposed to thoracic wall