Learn Extremity 4 Muscles by StudyGallery.com

Extremity 4

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Adductor Brevis

O: lower pubic pelvis
I: Pectineal line and superior part of medial lip of linea aspera
A: Adducts and flexes the thigh, and helps to laterally rotate the thigh
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Adductor Longus

O: Lower middle pubic pelvis
I: Middle third of linea aspera, between the more medial adductor magnus and brevis insertions and the more lateral origin of the vastus medialis
A: Adducts and flexes the thigh, and helps to laterally rotate the hip joint
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Adductor Magnus

O: lower pelvis pubic
I: Gluteal tuberosity of femur, medial lip of linea aspera, medial supracondylar ridge, and adductor tubercle
A: Powerful thigh adductor; superior horizontal fibers also help flex the thigh, while vertical fibers help extend the thigh
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Biceps Femoris – Long Head

O:
I: Primarily on fibular head; also on lateral collateral ligament and lateral tibial condyle
A: Flexes the knee, and also rotates the tibia laterally; long head also extends the hip joint
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Opponens Pollicis

O: Flexor retinaculum, scaphoid and trapezium
I: Lateral side of 1st metacarpal
A: Draws 1st metacarpal laterally to oppose thumb toward center of palm and rotates it medially
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Palmaris Longus

O: Humerus
I: palmar aponeurosis
A: wrist flexor
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Popliteus

O:
I: Posterior surface of tibia in a fan-like fashion, just superior to the popliteal line
A: Rotates knee medially and flexes the leg on the thigh Questions

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Psoas

O:
I: Lesser trochanter
A: Flex the torso and thigh with respect to each other Questions

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Quadratus Femoris

O:
I: Quadrate tubercle and adjacent bone of intertrochanteric crest of proximal posterior femur
A: Rotates the hip laterally; also helps adduct the hip Questions

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Rectus Femoris

O: Iliac spine near Ilium
I: Base of patella to form the more central portion of the quadriceps femoris tendon
A: Extends the knee, flexes hip joint
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Sartorius

O: Iliac spine near ilium
I: Superior aspect of the medial surface of the tibial shaft near the tibial tuberosity
A: Flexes and laterally rotates the hip joint and flexes the knee
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Semimembranosus

O:
I: Posterior surface of the medial tibial condyle
A: Extends the thigh, flexes the knee, and also rotates the tibia medially, especially when the knee is flexed Questions

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Semitendinosus

O:
I: Superior aspect of medial portion of tibial shaft
A: Extends the thigh and flexes the knee, and also rotates the tibia medially, especially when the knee is flexed Questions

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Supinator

O:
I: Lateral, posterior and anterior surfaces of proximal 1/3 of radius
A: Supinates forearm (i.e., rotates radius to turn palm anteriorly)
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Supraspinatus

O: Top of scapula
I: Superior facet on greater tuberosity of humerus
A: Initiates and assists deltoid in abduction of arm and acts with other rotator cuff muscles
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Tensor Fascia Lata

O:
I:
A: Questions

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Teres Major

O: Scapula
I: Medial lip of intertubercular groove of humerus
A: Adducts and medially rotates arm
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Teres Minor

O: Scapula
I: Inferior facet on greater tuberosity of humerus
A: Laterally rotate arm; helps to hold humeral head in glenoid cavity of scapula
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Tibialis Anterior

O: Lateral of top tibia
I: Medial and plantar surfaces of 1st cuneiform and on base of first metatarsal
A: Dorsiflexor of ankle and invertor of foot
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Tibialis Posterior

O: Between the top of fibula and tibia
I: Splits into two slips after passing inferior to plantar calcaneonavicular ligament; superficial slip inserts on the tuberosity of the navicular bone and sometimes medial cuneiform; deeper slip divides again into slips inserting on plantar surfaces of metatarsals 2 - 4 and second cuneiform
A: Principal invertor of foot; also adducts foot, plantar flexes ankle, and helps to supinate the foot
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Trapezius

O: C7 - T12 vertebrae
I: Lateral third of clavicle, acromion, and spine of scapula
A: Elevates, retracts and rotates scapula; superior fibers elevate, middle fibers retract, and inferior fibers depress scapula; superior and inferior fibers act together in superior rotation of scapula
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Triceps Brachii

O:
I: Proximal end of olecranon process of ulna and fascia of forearm
A: Chief extensor of forearm; long head steadies head of abducted humerus
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Vastus Intermedius

O: Front top of femur
I: Lateral border of patella; also forms the deep portion of the quadriceps tendon
A: Extends the knee
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Vastus Lateralis

O: Top lateral of femur
I: Lateral base and border of patella; also forms the lateral patellar retinaculum and lateral side of quadriceps femoris tendon
A: Extends the knee
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Vastus Medialis

O: Middle of femur
I: Medial base and border of patella; also forms the medial patellar retinaculum and medial side of quadriceps femoris tendon
A: Extends the knee
Wikipedia Questions