|
Activity |
Muscles |
Action |
Innervation |
|
Turning a door knob |
Pronator teres |
Pronates forearm at radioulnar joints and weakly flexes forearm at the elbow joint |
Median nerve |
|
Pronator quadratus |
Pronates forearm at radioulnar joints |
Median nerve |
|
|
Supinator |
Supinates forearm at radioulnar joints |
Deep radial nerve |
|
Throwing a baseball overhead |
Deltoid |
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 joint |
Axillary nerve |
|
Supraspinatus |
Assists deltoid muscle in abducting arm at shoulder joint |
Suprascapular nerve |
|
|
Infraspinatus |
Laterally rotates arm at shoulder joint |
Subscapular nerve |
|
Kicking a ball |
Biceps femoris |
Flexes leg at knee joint and extends thigh at hip joint. |
Tibial and fibular nerves from sciatic nerve |
|
Fibularis longus |
Plantar flexes foot at ankle joint and everts (pronates) foot at intertarsal joints |
Superficial fibular (peroneal) nerve |
|
|
Plantaris |
Plantar flexes foot at ankle joint and flexes leg at knee joint |
Tibial nerve |
|
Doing sit-ups |
Rectus abdominis |
Flexes vertebral column, compresses abdomen |
Thoracic spinal nerves T7-T12 |
|
External oblique |
Compresses abdomen, flexes and rotates vertebral column |
Thoracic spinal nerves T7-T12, and the Iliohypogastric nerve |
|
|
Serratus anterior |
Compresses abdomen |
Thoracic spinal nerves T8-T12, Iliohypogastric nerve, and Ilioinguinal nerve |
|
Walking |
Soleus |
Plantar flexes foot at the ankle joint |
Tibial nerve |
|
Tibialis posterior |
Plantar flexes foot at ankle joint and inverts (supinates) foot at intertarsal joints |
Tibial nerve |
|
|
Plantaris |
Plantar flexes foot at ankle joint and flexes leg at knee joint |
Tibial nerve |
|
Breathing |
Diaphragm |
Inhalation: Contraction flattens and increases vertical dimension of thoracic cavity Exhalation: relaxation causes diaphragm to move superiorly and decreases vertical dimension of thoracic cavity |
Phrenic nerve containing axons from cervical spinal nerves C3-C5 |
|
External intercostals |
Inhalation: Contraction elevates ribs and increases anteroposterior and lateral dimensions of thoracic cavity Exhalation: relaxation depresses ribs and decreases anteroposterior and lateral dimensions of thoracic cavity |
Thoracic spinal nerves T2-T12 |
|
|
Internal intercostals |
Forced exhalation: Contraction draws adjacent ribs together to decrease anteroposterior and lateral dimensions of thoracic cavity |
Thoracic spinal nerves T2-T12 |