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Turning a door knob
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Supinator
Action: supinates forearm at radioulnar joints
Innervation: deep radial nerve -
Brachioradialis
Action: flexes the forearm at elbow joint; supinates and pronates forearm at radioulnar joints to neutral position
Innervation: radial nerve -
Biceps brachii
Action: flexes forearm at the elbow joint, supinates forearm at radioulnar joints, and flexes the arm at shoulder joint
Innervation: musculocutaneous nerve
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Throwing a baseball overhead
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Teres Major
Action: Extends arm at shoulder joint and assists in adduction and medial rotation of arm at shoulder joint
Innervation: Lower subscapular nerve -
Subscapularis
Action: Medially rotates arm at shoulder joint
Innervation: upper and lower subscapular nerve. -
Deltoid
Action: lateral fibers abduct arm at shoulder joint; anterior fibers flex and medially rotate arm at shoulder joint; posterior fibers extend and laterally rotate arm at shoulder
Innervation: axillary nerve -
Pectoralis Major
Action: adducts and medially rotates arm at shoulder joint
Innervation: medial and lateral perctoral nerves
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Kicking a ball
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Quadriceps femoris (Rectus femoris)
Action: extend and raise the knee
Innervation: femoral nerve -
Psoas Major
Action: flexes thigh and hip joint, laterally rotate thigh, and flexes trunk on hip
Innervation: Lumbar spinal nerve -
Iliacus
Action: flexes and rotates femur
Innervation: Femoral nerve
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Doing sit-ups
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Rectus abdominis
Action: flexes vertebral column especially lumbar portion
Innervation: Thoracic spinal nerves T7-T12 -
External oblique
Action: compresses the abdomen and flexes vertebral column
Innervation: Thoracic spinal nerves T7-T12 and the iliohypogastric nerve -
Transversus abdominis
Action: compresses abdomen
Innervation: Thoracic spinal nerves T8-T12, iliohypogastric nerve, and ilioinguinal nerve -
Psoas Major
Action: flexes thigh and hip joint and flexes trunk on hip
Innervation: Lumbar spinal nerve
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Walking
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Tibialis posterior
Action: flexes distal and middle proximal phalanx of each toe phalanges of each toe at interphalangeal joints and metatarsophalangeal joint
Innervation: Tibial nerve -
Soleus
Action: plantar flexes foot at ankle joint
Innervation: Tibial nerve -
Gastrocnemius
Action: plantar flexes foot at ankle joint and flexes leg at knee joint
Innervation: Tibial nerve
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Breathing
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Diaphragm
Action: increases the vertical dimension of the thoracic cavity resulting in inhalation
Innervation: phrenic nerve, which contains axons from cervical spinal nerves -
Internal intercostals
Action: draws adjacent ribs together to further decrease anteroposterior and lateral dimensions of thoracic activity during forced exhalation
Innervation: Thoracic spinal nerves T2-T12 -
External intercostals
Action: elevates ribs and increases anteroposterior and lateral dimensions of thoracic activity, making inhalation possible
Innervation: Thoracic spinal nerves T2-T12