- Turning a door knob
Flexor digitorum superficialis
- action: flexion of digits 2-5
- innervation: Median nerve (C8, T1)
Flexor pollicis longus
- action: thumb flexion
- innervation: median nerve (anterior interosseous nerve,C7, C8)
Opponens pollicis
- action: allows the thumb to meet any finger at the carpometacarpal joint
- innervation: median nerve - Throwing a baseball overhead
Triceps brachii
- action: extension of forearm at elbow joint and extension of the arm at shoulder joint
- innervation: radial nerve
Biceps brachii
- action: flexes the forearm at the elbow joint, supinates forearm at radioulnar joints, and flexes arm at shoulder joint
- innervation: Musculocutaneous nerve
Supraspinatus
- action: assists deltoid muscle in abducting arm at shoulder joint
- innervation: suprascapular nerve - Kicking a ball
Quadriceps femoris
- action: thigh flexion at the hip joint; leg extension at the knee joint
- innervation: femoral nerve
Biceps femoris
- action: flexes leg at the knee joint and extends thigh at hip joint
- innervation: Tibial and fibular nerves from sciatic nerve
Gluteus maximus
- action: extends thigh at the hip joint and laterally rotates thigh; helps lock the knee in extension
- innervation: Inferior gluteal nerve - Doing sit-ups
Rectus abdominis
- action: flexes vertebral column, compresses abdomen to aid in defecation, urination, forced exhalation, and childbirth
- innervation: Thoracic spinal nerves T7-T12
Iliopsoas
- action: flexion and external rotation of the thigh at the hip joint; flexion of the trunk at the hip, lateral flexion of the trunk.
- innervation: Lumbar spinal nerves L2–L3
Rectus femoris
- action: extend the leg at the knee joint, flexes thigh at hip joint
- innervation: femoral nerve - Walking
Semitendinosus
- action: flexes leg at the knee joint and extends thigh at the hip joint
- innervation: Tibial nerve from sciatic nerve
Gluteus medius
-action: Abducts thigh at the hip joint and medially rotates thigh
- innervation: superior gluteal nerve
Gastrocnemius
- action: Plantar flexes foot at ankle joint and flexes leg at knee joint
- innervation: Tibial nerve - Breathing
Diaphragm
- action: flatten and increase vertical dimension of thoracic cavity, move superiorly and decrease vertical dimension of thoracic cavity
- innervation: Phrenic nerve
External intercostals
- action: elevate ribs during forced inspiration
- innervation: Thoracic spinal nerves T2-T12
Interval intercostal
- action: depress ribs during forced expiration
- innervation Thoracic spinal nerves T2-T12