The Neck Muscle
Latissimus dorsi is the muscle that extends from the ribs to the pubis and compresses the abdomen.
trapezius muscle
Triceps Brachii extends the forearm at the elbow joint.
extends your forearm
The erector spinae
The posterior deltoid is one extensor of the upper arm.
cranial tibial muscles
the shoulder muscle extends the arm
gastrocin
extensor digitorium longus
extensor digitorum