1. Throwing a baseball overhead
- Teres major
Action: Adduction and medial rotation of arm at shoulder joint, produce movement of the humerus at the glenohumeral joint
Innervation: Lower subscapular nerve - Latissimus dorsi
Action: Extension, adduction and medial rotation of the upper limb at the shoulder; raising trunk above arm
Innervation: Thoracodorsal nerve
2. Kicking a ball
- Sartorius
Action: Flexes hip and knee, laterally rotates thigh if flexed at hip
Innervation: Femoral nerve - Gluteus maximus
Action: Lateral rotation of hip joint, maintenance of extended knee joint
Innervation: Inferior gluteal nerve
3. Doing sit-ups
- Rectus abdominis
Action: Trunk flexion, compresses abdominal viscera during intense effort, depresses ribs
Innervation: Thoracoabdominal nerves - Obliquus externus abdominis
Action: Helps rotate and twist the trunk, stabilized core of the body
Innervation: Intercostal nerves, subcostal nerve
4. Breathing
- Diaphragm
Action: Primary muscle involved in breathing, contracts chest during inhalation, relaxes chest during exhalation
Innervation: Phrenic nerves - External Intercostal Muscles
Action: Elevates ribs, provides structural support to intercostal spaces
Innervation: Anterior rami of thoracic nerves