1.
Muscle: Latissimus Dorsi
Action: Extends, adducts, and medially rotates arm at shoulder joint, draws arm inferiorly and posteriorly
Innervation: Thoracodorsal nerve
Muscle: Triceps Brachii
Actions: Extends forearm at elbow joint and arm at shoulder joint
Innervation: Radial Nerve
2.
Muscle: Biceps Femoris
Action: Flexes leg at knee joint and extends thigh at hip joint
Innervation: Tibial and fibular nerves from sciatic nerve
Muscle: Rectus femoris
Action: Extend leg at knee joint and flexes thigh at hip joint
Innervation: Femoral nerve
3. Muscle: Rectus Abdominis
Action: Flexes vertebrae, compress abdomen
Innervation: Thoracic spinal nerve T7-T11
Muscle: External Oblique
Action: Compress abdomen and flex vertebrae
Innervation: Thoracic spinal nerves and iliohypogastric nerve
4. Muscle: Diaphragm
Actions: Contracts to increase dimension of thoracic cavity
Innervation: Phrenic Nerve
Muscle: External Intercostals
Actions: Contraction elevates rbs and increase dimensions of thoracic cavity
Innervation: Thoracic spinal nerves T2-T12