APK Muscles 2
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- Gastrocnemius
- Origin: by two heads from medial and lateral condyles of femur Insertion: posterior calcaneus via calcaneal tendon Action: plantar flexes foot
- Soleus
- Origin: extensive cone-shaped origin from superior tibia, fibula, and interosseus membrane Insertion: posterior calcaneus via calcaneal tendon Action: plantar flexes foot
- Tibialis Anterior
- Origin: lateral condyle and upper 2/3 of tibial shaft Insertion: by tendon into inferior surface of medial cuneiform and first metatarsal bone Action: prime mover of dorsiflexion
- Rectus Femoris
- Origin: anterior inferior iliac spine and superior margin of acetabulum Insertion: patella and tibial tuberosity via patellar ligament Action: extends knee and flexes thigh at hip
- Vastus Lateralis
- Origin: greater trochanter, intertrochantic line, linea aspera Insertion: patella and tibial tuberosity via patellar ligament Action: extends and stabilizes knee
- Vastus Medialis
- Origin: linea aspera, medial supracondylar line, intertrochantic line Insertion: patella and tibial tuberosity via patellar ligament Action: extends knee
- Vastus Intermedius
- Origin: anterior and lateral surfaces of proximal femur shaft Insertion: patella and tibial tuberosity via patellar ligament Action: extends knee
- Biceps Femoris
- Origin: ischial tuberosity (long head); linea aspera, lateral supracondylar line, and distal femur (short head) Insertion: common tendon passes downward and laterally to insert into head of fibula and lateral condyle of tibia Action: extends thigh and flexes knee
- Semimembranosus
- Origin: ischial tuberosity Insertion: medial condyle of tibia Action: extends thigh and flexes knee
- Semitendinosus
- Origin: ischial tuberosity in common with long head of biceps femoris Insertion: medial aspect of upper tibial shaft Action: extends thigh at hip
- Brachialis
- Origin: front of distal humerus Insertion: coronoid process of ulna and capsule of elbow joint Action: a major arm flexor
- Brachioradialis
- Origin: lateral supracondylar ridge at distal end of humerus Insertion: base of styloid process of radius Action: synergist in forearm flexion
- Triceps Brachii
- Origin: long head: infraglenoid tubercle of scapula; lateral head: posterior shaft of humerus; medial head: posterior humeral shaft distal to radial groove Insertion: by common tendon into olecranon process of ulna Action: powerful forearm extensor
- Gracilis
- Origin: inferior ramus and body of pubis and adjacent ischial ramus Insertion: medial surface of tibia just inferior to its medial condyle Action: adducts thigh, flexes and medially rotates leg
- Sartorius
- Origin: anterior superior iliac spine Insertion: winds around medial aspect of knee and inserts into medial aspect of proximal tibia Action: flexes, abducts, and laterally rotates thigh
- Adductor Magnus
- Origin: ischial and pubic rami and ischial tuberosity Insertion: linea aspera, medial supracondylar line, and adductor tubercle of femur Action: adducts and medially rotates and flexes thigh
- Palmaris Longus
- Origin: medial epicondyle of humerus Insertion: fascia of palm Action: tenses skin and fascia of palm during hand movements
- Tensor Fasciae Latae
- Origin: anterior aspect of iliac crest and anterior superior iliac spine Insertion: iliotibial tract Action: steadies trunk on thigh by making iliotibial tract taut
- Iliacus
- Origin: iliac fossa Insertion: lesser trochanter of femur via iliopsoas tendon Action: primer mover in thigh flexion and in flexing trunk
- Psoas Major
- Origin: by fleshy slips from transverse processes. bodies, and discs of lumbar vertebrae and T12 Insertion: less trochanter of femur via iliopsoas tendon Action: prime mover in thigh flexion and in flexing trunk