bio 201 muscles

muscle name & function

Brachialis (below the muscle) is a muscle located in the upper arm that flexes the elbow joint. (elbow flexion- bringing spoon to mouth)

muscle & function

biceps brachii - muscle in the upper arm - flexes elbow, supinates forearm (scooping up water in hand to drink)

muscle name & function

brachioradialis - flexes the elbow while thumb pointing upwards (thumbs up)

muscle name & function

flexor carpi radialis? or extensor carpi radialis - flexes wrist, radially deviates wrist (aBduction)

muscle name & function

triceps brachii (posterior) - extends forearm at elbow (as in lowering a spoon back to the table)

muscle name & function

extensor carpi radialis? - extends wrist, radially deviates wrist (aBduction) (moves hand towards thumb side)

muscle name & function

Flexor Digitorum? - flexes digits of the hand and wrist

muscle name & function

Pronator Teres - pronates forearm at elbow (turning a doorknob laterally)

muscle name & function

Extensor Digitorum - extends digits of the hand and wrist

muscle name & function

Extensor Carpi Ulnaris - extends wrist, ulnar deviates wrist (aDduction) (moves hand toward the pinky side)

muscle name & function

Flexor Carpi Ulnaris - flexes wrist, ulnar deviates wrist (aDduction)

muscle name & function

Middle Deltoid - abducts humerus at shoulder (as in upward flap)

muscle name & function

Posterior Deltoid - extension & lateral rotation of humerus at shoulder

muscle name & action

Anterior Deltoid - flexion & medial rotation of humerus at shoulder

muscle name & action

Teres Minor (posterior) - laterally rotates humerus at shoulder

• stabilizes shoulder

muscle name & action

Pectoralis Major - flexion, adduction, medial rotation of humerus at shoulder (as in overhead fist raise, or bench press motion)

muscle name & action

Supraspinatus - abducts arm at shoulder

• stabilizes shoulder

muscle name & action

Latissimus Dorsi - extension, adduction, medially rotation humerus at shoulder (gym lat pull-downs)

muscle name & action

Subscapularis (anterior) - medially rotates humerus at shoulder

• stabilizes shoulder

muscle name & action

Infraspinatus (posterior) - laterally rotates humerus at shoulder 

• stabilizes shoulder

muscle name & function

Frontalis - raise eyebrows

muscle name & function

Orbicularis Oculi - closes eye (squint), lowers eyebrows

muscle name & function

Orbicularis Oris - Closes lips (purses, protrudes)

muscle name & function

Zygomaticus Major - Raises corners of mouth (smile)

muscle name & function

Buccinator - compress cheeks (whistling, sucking)

muscle name & action

Platysma - pulls lower lip down (as in frowning)

Depresses mandible (opening mouth as when chewing or surprised)

muscle name & action

Masseter - elevates mandible (as in closing mouth while chewing)

muscle name & function

Temporalis - elevates mandible

muscle name & function

Sternocleidomastoid -

Both sides: flexes neck (as in looking down)

One side: cocks head

muscle name & action

Splenius Capitis -

Both sides: extends neck (as in looking up)

One side: cocks head

muscle name & action

Levator Scapulae (deep view) - elevates & retracts scapula (as in bringing shoulder up & in toward ear

muscle name & action

Upper Trapezius - elevates scapula (as in shrugging)

muscle name & action

Middle Trapezius - Retracts scapula (as in pulling shoulders back) 

muscle name & action

Lower Trapezius - Retracts & depresses scapula (as in pulling shoulders back & down)

muscle name & action

Spinalis Thoracis -

One side: lateral flexion of vertebral column

Both sides: extension & hyperextension of vertebral column

muscle name & action

Rhomboideus Major (deep view) - retracts scapula (as in pulling the shoulders back)

muscle name & action

Psoas Major - flexes hip (as in lifting leg to place on stair)

muscle name & action

Rectus Abdominis - compresses abdomen, flexes vertebral column

muscle name & action

Serratus Anterior - protracts scapula (which pushes the arm forward in front of the scapula, as in punching or hugging)

muscle name & action

Diaphragm - drops down to enlarge thoracic cavity, causing inspiration?