Muscular System Origin, Insertions, and Action
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| Origin: Occipital Bone and Upper Ligamentum Nuchae | show 🗑
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| Insertion: Lateral and posterior 1/3rd of Clavicle | show 🗑
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| Action: From above, elevate the shoulder girdle; From below, hyperextend the neck | show 🗑
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| show | Trapezius II
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| Insertion: top of the acromion process | show 🗑
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| Action: Force couple with Trapezius IV to upwardly rotate the scapula | show 🗑
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| Origin: T1-T4 | show 🗑
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| show | Trapezius III
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| show | Trapezius III
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| show | Trapezius IV
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| show | Trapezius IV
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| show | Trapezius IV
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| show | Gluteus Medius
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| show | Gluteus Medius
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| Action: Abducts with gluteus minimus; posterior fibers ER | show 🗑
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| Origin: Lateral condyle and upper 2/3rds of the lateral surface of the tibia | show 🗑
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| Insertion: Plantar surface of base of the 1st metatarsal and medial surface of 1st cuneiform | show 🗑
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| Action: Dorsi-flexion of ankle; supination (Adduction and Inversion) of foot | show 🗑
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| show | Quadratus Lumborum
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| Insertion: Last rib and the transverse processes of the upper four lumbar vertebrae. | show 🗑
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| Action: Bilateral they depress the ribs; one side alone produces ipsilateral flexion or stabilizes the pelvis when the ipsilateral foot is off the floor. | show 🗑
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| Origin: Transverse and costal processes of C2-C7 | show 🗑
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| Insertion: Superior surface of rib 1 | show 🗑
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| Insertion: Superior surface of rib 2 | show 🗑
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| show | Scalenes - Anterior, Middle and Posterior
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| Origin: External and inferior borders of ribs 5-12 | show 🗑
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| show | External Abdominal Oblique
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| show | External Abdominal Oblique
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| Origin: Inner margins of the pubis | show 🗑
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| Insertion: Coccyx and median raphe (ligament where muscles attach to each other) | show 🗑
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| Action: Assists iliococcygeus and coccygeus to elevate and retract anus; medial fibers from the pubovaginalis and puboanalis and act as the sphincter urethrae | show 🗑
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| Origin: Outer surface or upper 9 ribs at the side of the chest. | show 🗑
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| show | Serratus Anterior
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| show | Serratus Anterior
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