Turning a door knob
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Supinator
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Action: supinates forearm at radioulnar joints
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Innervation: Deep radial nerve
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Pronator quadratus
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Action: Pronates forearm at radioulnar joints
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Innervation: Median nerve
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Pronator teres
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Action: Pronates forearm at radioulnar joints and weakly flexes forearm at elbow joint
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Innervation: Median nerve
Throwing a baseball overhead
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Teres Major
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Action: Extends arm at the shoulder joint and assists in adduction and medial rotation of the arm at the shoulder joint
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Innervation: Lower subscapular nerve
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Subscapularis
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Action: Medially rotates arm at the shoulder joint.
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Innervation: Upper and lower subscapular nerve
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Deltoid
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Action: At the shoulder joint, posterior fibers cause the arm to stretch and rotate laterally. While the lateral fibers abduct the arm at the shoulder joint. Lastly, anterior fibers flex and medially rotate the arm at the shoulder joint.
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Innervation: Axillary nerve
Kicking a ball
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Gluteus medius
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Action: abducts thigh at hip joint and medially rotates thigh
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Innervation: superior gluteal nerve
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Vastus medialis
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Action: extend leg at knee joint
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Innervation: femoral nerve
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Rectus femoris
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Action: extend leg at knee joint and flexes thigh at hip joint
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Innervation: femoral nerve
Doing sit-ups
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Rectus abdominis
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Action: Flexes vertebral column, especially lumbar portion, and compresses abdomen to aid in defecation, urination, forced exhalation, and childbirth. Flexes pelvis on the vertebral column
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Innervation: Thoracic spinal nerves
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Iliopsoas
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Action: Psoas major and iliacus muscle acting together flex thigh at hip joint, rotate thigh laterally, and flex trunk on hip
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Innervation: Lumbar spinal nerves L2-L3
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External obliques
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Action: Acting together (bilaterally), compress abdomen and flex vertebral column; acting singly (unilaterally), laterally flex vertebral column, especially lumbar portion, and rotate vertebral column
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Innervation: Thoracic spinal nerves T7-T12 and the iliohypogastric nerve
Walking
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Gastrocnemius
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Action flexes the leg, plantar flexes foot
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Innervation: tibial nerve
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Tibialis anterior
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Action: Inverts and dorsiflexes the foot
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Innervation: deep fibular (peroneal) nerve (L4,L5)
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Soleus
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Action: Plantar flexes foot at ankle joint
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Innervation: Tibial nerve (S1, S2)
Breathing
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Diaphragm
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Action: Contraction which increases vertical dimension of thoracic cavity (inhale) and relaxation which decreases vertical dimension of thoracic cavity (exhale) of diaphragm
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Innervation: phrenic nerve, which contains axons from cervical spinal nerves C3-C5.
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External intercostals
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Action: Contraction which elevates ribs and increases anteroposterior and lateral dimensions of thoracic cavity (inhale) and relaxation which depresses ribs and decreases anteroposterior and lateral dimensions of thoracic cavity (exhale)
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Innervation: thoracic spinal nerves T2-T12.
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Internal intercostals
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Action: Contraction that draws adjacent ribs together to decrease anteroposterior and lateral dimensions of thoracic cavity (forced exhalation)
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Innervation: thoracic spinal nerves T2-T12.