- Throwing a Baseball Overhead
- Deltoid:
- Action: Abducts, flexes, and medially rotates the humerus (shoulder joint).
- Innervation: Axillary nerve (C5, C6)
- Rotator cuff muscles (supraspinatus, infraspinatus, teres minor, subscapularis):
- Action: Provide stability and strength to the shoulder joint.
- Innervation: Supraspinatus (suprascapular nerve), infraspinatus and teres minor (axillary nerve), subscapularis (anterior circumflex nerve)
- Deltoid:
- Kicking a Ball
- Quadriceps femoris (rectus femoris, vastus lateralis, vastus medialis, vastus intermedius):
- Action: Extends the knee.
- Innervation: Femoral nerve (L2-L4)
- Iliopsoas:
- Action: Flexes the hip.
- Innervation: Iliohypogastric nerve (L1), ilioinguinal nerve (L1)
- Quadriceps femoris (rectus femoris, vastus lateralis, vastus medialis, vastus intermedius):
- Doing Sit-Ups
- Rectus abdominis:
- Action: Flexes the trunk.
- Innervation: Thoracic nerves (T6-T12)
- External oblique:
- Action: Flexes, rotates, and laterally bends the trunk.
- Innervation: Thoracic nerves (T6-T12), lumbar nerves (L1-L5)
- Rectus abdominis:
- Breathing
- Diaphragm:
- Action: Contracts to flatten the dome, expanding the thoracic cavity during inhalation. Relaxes during exhalation.
- Innervation: Phrenic nerve (C3, C4, C5)
- Intercostal muscles:
- Action: Assist in expanding and contracting the thoracic cavity during breathing.
- Innervation: Intercostal nerves (T1-T12)
- Diaphragm: