Download origins, insertions and prime mover actions of muscles in ... and more Study notes Human Physiology in PDF only on Docsity!
ORIGINS, INSERTIONS AND PRIME MOVER ACTIONS OF MUSCLES IN FIGURE 6.8Muscle Origin^ Insertion
Actions Adductor Longus^ Anterior surface of pubis^
Adducts thigh Adductor Magnus^ Ischial and pubic rami and ischial tuberosity
Medial half of linea asperaAdducts thighon the femur Biceps Brachii^ Long head – upper margin of glenoid fossa;short head – coracoid process of scapula
Radial (bicipital) tuberosityFlexes and supinates forearmof radius Biceps Femoris^ Long head – ischial tuberosity; short head –linea aspera of femur
Lateral aspect of head ofFlexes knee; long head extends thighfibula and lateral condyle oftibia Brachialis^ Anterior surface of lower ½ of humerus
Anterior surface ofFlexes forearmcoranoid process of ulna rd^ Brachioradialis Upper 2/3of lateral supracondylar ridge ofhumerus Base of styloids process ofFlexes forearmhumerus Deltoid - AnteriorAnterior border of outer 1/3- Medial- Posterior
rd^ of clavicle}Flexes and horizontally flexes humerus} Acromion process and lateral end of clavicle}Deltoid tuberosity ofAbducts and horizontally flexes humerus}humerus (lateral aspect ofLower margin of spine of scapula}humerus near midpoint)Extends and horizontally extends}humerus Extensor Digitorum^ Lateral epicondyle of humerus
Distal phalanges of fingersExtends fingers at metacarpophalangeal2-5and interphalangeal joints Extensor DigitorumLateral condyle of tibia and upper ¾ ofLongusanterior surface of fibula
Second and third phalangesDorsiflexes and everts foot and extendsof four lesser toestoes Extensor CarpiLateral epicondyle and supracondylar ridgeRadialis Longusof humerus
nd^ Base of 2metacarpal^ Extends and abducts wrist Extensor CarpiLateral epicondyle of humerus and posteriorUlnarisborder of ulna
th^ Base of 5metacarpal^ Extends and adducts wrist External Obliques^ Outer surfaces of lower eight ribs
Anterior half of crest ofFlexes and laterally flexes trunk, rotatesilium and from ribs totrunk to opposite sidepublic crest
Flexor Carpi Radialis^ Medial epicondyle of humerus
nd^ Base of 2metacarpal^ Flexes and abducts wrist Flexor Carpi Ulnaris^ Medial epicondyle of humerus, posteriorsurface and olecranon process of ulna
Pisiform bone and base ofFlexes and adducts wristth^5 metcarpal Gastrocnemius^ By two heads from medial and lateralcondyles of femur
Calcaneus through AchillesPlantar flexes foot; can help flex kneetendon Gluteus Maximus^ Posterior gluteal line of ilium, lower part ofsacrum, coccyx
Posterior surface of femurExtends and externally rotates thighat gluteal tuberosity,iliotibial tract Gluteus Medius^ Lateral surface of ilium between anterior andposterior gluteal lines
Lateral aspect of greaterAbducts and internally rotates thightrochanter of femur Gracilis^ Inferior ramus and body of pubis
Medial surface of tibia justAdducts thigh; helps extend andbelow medial condyleinternally rotate knee Iliopsoas^ Iliacus – iliac fossa; Psoas Major – transverseprocesses, bodies and discs of 12
Lesser trochanter of femur^ Flexes thighth thoracicvertebra and all lumbar vertebrae rd^ Infraspinatus Medial 2/3of infraspinous fossa of scapula Greater tubercle of humerus^ Outwardly rotates and horizontallyextends humerus Intercostals^ External – inferior border of rib above;Internal – superior border of rib below
External – superior borderRespirationof rib below; Internal –inferior border of rib above Internal Obliques^ Linea alba, pubic crest and lower three ribs
Crest of ilium and inguinalFlexes and laterally flexes trunk, rotatesligamenttrunk to same side Latissimus Dorsi^ Spinous processes of lower six thoracic andall lumbar vertebrae, posterior surface ofsacrum, iliac crest, lower three ribs
Inferior portion ofExtends and adducts humerusintertubercular groove ofhumerus Palmaris Longus^ Medial epicondyle of humerus
Palmar aponeurosis^ Weak flexor of wrist Pectineus^ Pectineal line of pubis on superior ramus
Pectineal line of femurFlexes and adducts thighbetween lesser trochanterand linea aspera rd^ Pectoralis Major Medial 2/3 of anterior border of clavicle,anterior surface of sternum, cartilage of ribs1- Greater tubercle of humerusFlexes, internally rotates, adducts and(lateral surface of humerus)horizontally flexes humerus
anterior surface of humerus^ humerus Tibialis Anterior^ Lateral condyle and upper 2/
rd^ of lateralInferior surface of medialDorsiflexes and inverts footsurface of tibiacuneiform and firstmetatarsal TransversusInguinal ligament, iliac crest, lumbodorsalAbdominisfascia, cartilages of lower six ribs
Linea alba and pubic crest^ Compresses abdominal contents Trapezius^ Occipital bone, ligamentum nuchae, spinousth^ processes of 7cervical vertebra and allthoracic vertebrae
Acromion process, spine ofRetracts and upwardly rotates scapula;scapula and posteriorupper fibres elevate scapula; middlerd^ border of lateral 1/3offibres retract scapula; lower fibresclavicledepress scapula Triceps Brachii^ Long head – infraglenoid tuberosity ofscapula; lateral head – posterior surface ofupper half of humerus; medial head –posterior surface of lower 2/
Olecranon process of ulna^ Extends forearmrd of humerus Vastus Lateralis^ Greater trochanter, upper part ofintertrochanteric line, and linea aspera offemur
Base of patella and, byExtends kneepatellar ligament, tibialtuberosity Vastus Medialis^ Linea aspera and lower half ofintertrochanteric line of femur
Base of patella and, byExtends kneepatellar ligament, tibialtuberosity
