1. Throwing a baseball overhead
a. Latissimus dorsi
- Action: Extends, adducts, and medially rotates arm at shoulder joint
- Innervation: Thoracodorsal nerve
b. Deltoid
- Action: abducts, flexes, extends, and rotates the arm at shoulder joint
- Innervation: Axillary nerve
2. Kicking a ball
a. Quadriceps femoris
- Action: Extends leg at knee joint and flexes thighs at hip joint
- Innervation: Femoral nerve
b. Biceps femoris
- Action: Flexes and extend the leg and thigh, respectively
- Innervation: Tibial and fibular nerves from sciatic nerve
3. Doing sit-ups
a. Rectus abdominis
- Action: Flexes vertebral column and compresses abdomen
- Innervation: Thoracic spinal nerves T7-T12
b. Transversus abdominis
- Action: Compresses the abdomen
- Innervation: Thoracic spinal nerves T8-T12, iliohypogastric and ilioinguinal nerve
4. Breathing
a. External intercostals
- Action: Increases/decreases anteroposterior and lateral dimension of thoracic cavity and elevates/depresses ribs
- Innervation: Thoracic spinal nerves T2-T12
b. Diaphragm
- Action: Increases/decreases vertical dimension of thoracic cavity
- Innervation: Phrenic nerve originating from cervical spinal nerves C3-C5