Chondroepitrochlearis
Chest & Trunk
A rare accessory slip from pectoralis major toward the arm — when present, it can compress neurovascular structures in the axilla.
Function
May assist arm adduction; can limit shoulder abduction if tight
Origin
Costal cartilages/pectoralis major region
Insertion
Medial humeral epicondyle or arm fascia
Innervation
Usually pectoral nerve branches