Answer:
Biceps brachii.
Step-by-step explanation:
Biceps brachii is the large muscle present between the elbow and shoulder. The muscle arise on the scapula and attaches the fore arm.
The biceps muscles works across the humeroulnar joint, glenohumeral joint and proximal radioulnar joint. Biceps brachii muscle helps in extension, flexion and abduction of the arm.
Thus, the answer is biceps brachii.