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25 Cards in this Set
- Front
- Back
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Sartorius origin and insertion
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origin: Anterior superior iliac spine; insertion: Winds around medial aspect of knee and inserts into medial aspect of proximal tibia
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Gluteus Maximus action
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Major extensor of thigh; complex, powerful, and most effective when thigh is flexed and force is necessary, as in rising from a forward flexed position and in thrusting the thigh posteriorly in climbing stairs and running generally inactive during walking; laterally rotates thigh; antagonist of iliopsoas muscle
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Gluteus Maximus innervation
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Inferior gluteal nerve
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Psoas Major origin and insertion
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origin: By fleshy slips from transverse processes, bodies, and discs of lumbar vertebrae and T12; insertion: Lesser trochanter of femur via iliopsoas tendon
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Sartorius action
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Flexes and laterally rotates thigh; flexes knee (weak); known as “tailor’s muscle” because it helps effect cross-legged position in which tailors are often depicted
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Sartorius innervation
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Femoral nerve
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Iliacus origin and insertion
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origin: Iliac Fossa; insertion: Lesser trochanter of femur via iliopsoas tendon
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Psoas Major action
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As above; also affects lateral flexion of vertebral column; important postural muscles
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Psoas Major innervation
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Ventral rami (L1-L3)
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Transversus Abdominis origin and insertion
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origin: Inguinal ligament, lumbodorsal fascia, cartilages of last six ribs; iliac crest; insertion: Linea alba, pubic crest
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Iliacus action
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Iliopsoas is the prime mover of hip flexion; flexes thigh on trunk when pelvis is fixed
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Iliacus innervation
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Femoral nerve
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Internal Oblique origin and insertion
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origin: Lumbodorsal fascia, iliac crest, and inguinal ligament; insertion: Linea alba, pubic crest, last three ribs
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Transversus Abdominis action
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Compresses abdominal contents
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Transversus Abdominis innervation
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Intercostal nerves (T7-T12) and L1
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External Oblique origin and insertion
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origin: By fleshy strips from outer surfaces of lower eight ribs; insertion: Most fibers into linea alba; some into pubic crest and tubercle and iliac crest; majority of fibers insert anteriorly via a broad aponeurosis
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Internal Oblique action
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As for external oblique
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Internal Oblique innervation
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Intercostal nerves (T7-T12) and L1
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Rectus Abdominus origin and insertion
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origin: Pubic crest and symphysis; insertion: Xiphoid process and costal cartilages of ribs 5-7
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External Oblique action
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When pair contracts simultaneously, aid rectus abdominis muscles in flexing vertebral column and in compressing abdominal wall and increasing intra-abdominal pressure; acting individually, aid muscles of back in trunk rotation and lateral flexion
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External Oblique innervation
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Intercostal nerves (T7-T12)
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Rhomboids origin and insertion
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origin: Spinous processes of C7 and T1 (minor); Spinous processes of T2-T5 (major); insertion: Medial border of scapula
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Rectus Abdominus action
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Flex and rotate lumbar region of vertebral column; fix and depress ribs, stabilize pelvis during walking, increase intra-abdominal pressure
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Rectus Abdominus innervation
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Intercostal nerves (T6 or T7-T12)
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Levator Scapulae origin and insertion
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origin: Transverse processes of C1-C4; insertion: Superior vertebral glenoid cavity downward; when scapula is fixed, flexes neck to same side
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