Chapter 11 – Study Guide

 

origin

insertion

belly

mechanical advantage

mechanical disadvantage

what is most closely related to range of motion? (fiber length or cross-sectional area of muscle?)

what is most closely related to power? (fiber length or cross-sectional area of muscle?)

agonist or prime mover

antagonist

synergist

fixator

compartment

 

deltoid                                   

                O=clavicle, scapula (acromion, spine)                            

                I=humerus (deltoid tuberosity)                                        

                A=flexion, extension, abduction (of arm)

coracobrachialis                 

                O=scapula (coracoid process)                                          

                I=humerus (mid medial shaft)                                         

                A=flexion, adduction (of arm)                         

latissimus dorsi                    

                O=T vertebrae, L vertebrae, inf. 4 ribs, ilium (crest)     

                I=humerus (intertubercular sulcus)                                 

                A=extension, adduction (of arm)    

teres major                           

                O=scapula (inf. angle)                                                       

                I=humerus (intertubercular sulcus)                                 

                A=extension, adduction (of arm)    

supraspinatus                      

                O=scapula (supraspinous fossa)                                      

                I=humerus (greater tubercle)                                            

                A=abduction (of arm)                       

pectoralis major                  

                O=clavicle, sternum, ribcage                                            

                I=humerus (greater tubercle, intertubercular sulcus)    

                A=adduction (of arm)       

 

                                                                                                                                                                                               

triceps brachii                      

                O=scapula (below glenoid), humerus (posterior)                          

                I=ulna (olecranon)                                             

                A=extension (of forearm)

brachialis                              

                O=humerus (distal anterior)                                                              

                I=ulna (coronoid process & tuberosity)          

                A=flexion (of forearm)

biceps brachii                      

                O=scapula (above glenoid, coracoid process)                               

                I=radius (radial tuberosity)                                               

                A=flexion (of forearm)

supinator                              

                O=humerus (lateral epicondyle), ulna                                            

                I=radius (lateral proximal 1/3rd)                      

                A=supination (of forearm)

pronator teres                      

                O=humerus (medial epicondyle), ulna (coronoid process)         

                I=radius (mid lateral surface)                           

                A=pronation (of forearm)

pronator quadratus            

                O=ulna (distal)                                                                                    

                I=radius (distal)                                                   

                A=pronation (of forearm)

 

 

gluteus maximus                

                O=ilium, sacrum, coccyx                  

                I=femur                                                

                A=extension (of thigh/leg at hip)

psoas major                         

                O=L vertebrae                                     

                I=femur (lesser trochanter)                               

                A=flexion (of thigh/leg at hip)

iliacus                                    

                O=ilium (iliac fossa), sacrum            

                I=femur (lesser trochanter)                               

                A=flexion (of thigh/leg at hip)

adductor longus                  

                O=pubis                                                

                I=femur (linea aspera)                       

                A=adduction (of thigh/leg at hip)

gluteus medius                    

                O=ilium                                                 

                I=femur (greater trochanter)            

                A=abduction (of thigh/leg at hip)

 

 

HAMSTRINGS

semimembranosus             

                O=ischium (ischial tuberosity)                                          

                I=tibia (medial condyle)                                    

                A=flexion (of lower leg at knee)

semitendinosus                   

                O=ischium (ischial tuberosity)                                          

                I=tibia (proximal medial shaft)                       

                A=flexion (of lower leg at knee)

biceps femoris                     

                O=ischium (ischial tuberosity), femur (linea aspera)   

                I=fibula (head), tibia (lateral condyle)           

                A=flexion (of lower leg at knee)

QUADRICEPS FEMORIS

rectus femoris                      

                O=ilium                                                 

                I=patella (tibial tuberosity)                               

                A=extension (of lower leg at knee)   

vastus medialis                   

                O=femur (anteromedial)                   

                I=patella (tibial tuberosity)                               

                A=extension (of lower leg at knee) 

vastus lateralis                    

                O=femur (anterolateral)                    

                I=patella (tibial tuberosity)                               

                A=extension (of lower leg at knee)

vastus intermedius             

                O=femur (anterolateral)                    

                I=patella (tibial tuberosity)                               

                A=extension (of lower leg at knee)