Lab Activity 11: Group IIIMusclesMartini Chapter 11Portland Community CollegeBI 2312• Origin: Upper portion of ilium, the sacrum and coccyx• Insertion: Gluteal tuberosity and iliotibial tract• Action: Principal extensor and lateral rotator of femurGluteus Maximus3• Origin: Middle portion of iliumInsertion: Oblique ridge on greater trochanter of femur• Action: Abducts femur, stabilizes contralateral hip while standing on one legGluteus Medius4• Origin: Pelvic surface of sacrum• Insertion:Greater trochanter of femur• Action: Rotates femur laterallyPiriformis5• Origin: Ischial tuberosity• Insertion: Greater trochanter and shaft of femur• Action: Rotates thigh laterallyQuadratus Femoris6• Origin: Transverse processes of bodies of lumbar vertebrae• Insertion: Lesser trochanter of femur with iliacus• Action: Flexes trunk and flexes and laterally rotates thighPsoas Major7• Origin: Iliac fossa and lateral margin of sacrum• Insertion: Lesser trochanter of femur with psoas major• Action: Flexes and laterally rotates femurIliacus8• Origin: Long head, ischial tuberosity;Short head, lateral supracondylar ridge of femur• Insertion: Head of fibula and lateral condyle of tibia• Action: Extends femur and flexes leg Biceps Femoris Long HeadShort Head9• Origin: Ischial tuberosity• Insertion: Medial condyle of tibia• Action: Extends femur and flexes legSemitendinosus10• Origin: Ischial tuberosity• Insertion: Medial condyle of tibia• Action: Extends femur and flexes legSemimembranosus11• Origin: Anterior superior iliac spine• Insertion: Medial margin of tibial tuberosity• Action: Flexes both femur and tibiaSartorius12• Origin: Anterior inferior iliac spine and upper margin of acetabulum• Insertion: Tibial tuberosity• Action: Extends tibia and flexes femurRectus Femoris13• Origin: Intertrochanteric line and linea aspera of femur• Insertion: Tibial tuberosity• Action: Extends tibiaVastus Lateralis14• Origin: Intertrochanteric line and linea aspera of femur• Insertion: Tibial tuberosity• Action: Extends tibiaVastus Medialis15• Origin: Upper shaft of femur• Insertion: Tibial tuberosity• Action: Extends tibiaVastus Intermedius16• Origin: Inferior pubic ramus• Insertion: Upper part of linea aspera • Action: Adducts, flexes, and medially rotates femurAdductor Brevis17• Origin: Between pubic rami near symphysis• Insertion: Middle third of linea aspera• Action: Adducts, flexes & medially rotates femurAdductor Longus18• Origin: Pubic arch and ischial tuberosity• Insertion: Linea aspera and adductor tubercle• Action: Adducts, flexes, and laterally and medially rotates femurAdductor Magnus19• Origin: Inferior pubis near symphysis• Insertion: Upper portion of tibia• Action: Adducts, flexes, medially rotates tibiaGracilis20Tensor Fasciae Latae • Origin: Iliac crest • Insertion: Iliotibial tract • Action: Flexes thigh, stabilizes knee21• Origin: Superior ramus of pubis• Insertion: Just inferior to the lesser trochanter• Action: Adducts and flexes thigh, assists with medial rotation of thighPectineus22• Origin: Medial and lateral condyles of femur• Insertion: With soleus into calcaneus via calcaneal tendon• Action: Flexes tibia and plantar; flexes footGastrocnemius Superficial23• Origin: Upper third of fibula and soleal line of tibia• Insertion: With gastrocnemius into calcaneus via calcaneal tendon• Action: Flexes footSoleus Second Layer24• Origin: Lateral supracondylar ridge of femur• Insertion: Posterior calcaneus via calcaneal tendon• Action: Weakly assists gastroc in plantar flexing ankle and flexing kneePlantaris Second Layer25• Origin: Lateral surface of lateral condyle• Insertion: Posterior surface of tibia just below condyles• Action: Flexes and unlocks knee jointPopliteus Second Layer26• Origin: Interosseous membrane and tibia and fibula on either side• Insertion: Navicular, with slips to cuneiform; cuboid; metatarsals 2-4• Action: Adducts and inverts foot and aids in plantar flexionTibialis Posterior ThirdLayer27• Origin: Middle half of tibia• Insertion: By four tendons into distal phalanges of lateral four toes• Action: Flexes lateral four toesFlexor Digitorum Longus ThirdLayer28• Origin: Distal two-thirds of fibula • Insertion: Distal phalanx of great toe• Action: Flexes great toeFlexor Hallucis Longus ThirdLayer29• Origin: Upper half of tibia and interosseous membrane• Insertion: Base of first cuneiform and first metatarsal• Action: Dorsiflexes and inverts footTibialis Anterior30• Origin: Middle half of fibula and interosseous membrane• Insertion: Distal phalanx of great toe• Action: Dorsiflexes foot and extends great toeExtensor Hallucis Longus Tendon31• Origin: Tibia, proximal three-fourths of fibula, & interosseous membrane• Insertion: Tendons to middle & terminal phalanges of four lateral toes by extensor expansion• Action: Dorsiflexes foot and extends toesExtensor Digitorum Longus Tendon32• Origin: Upper two-thirds of fibula and intermuscular septa• Insertion: Plantar base of first metatarsal and first cuneiform and • Action: Plantar flexes and everts footFibularis Longus33• Origin: Lower two-thirds of fibula• Insertion: Plantar base of fifth metatarsal• Action: Plantar flexes and everts footFibularis Brevis34• Origin: Dorsal surface of calcaneus• Insertion: By four tendons into extensor expansion• Action: Extends toesExtensor Digitorum Brevis35• Origin: Medial surface of calcaneus• Insertion: Proximal phalanx of great toe• Action: Extends toesExtensor Hallucis Brevis36The