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Origin: Occipital Bone and Upper Ligamentum Nuchae
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Insertion: Lateral and posterior 1/3rd of Clavicle
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Muscle O I A

Muscular System Origin, Insertions, and Action

QuestionAnswer
Origin: Occipital Bone and Upper Ligamentum Nuchae Trapezius I
Insertion: Lateral and posterior 1/3rd of Clavicle Trapezius I
Action: From above, elevate the shoulder girdle; From below, hyperextend the neck Trapezius I
Origin: ligamentum nuchae Trapezius II
Insertion: top of the acromion process Trapezius II
Action: Force couple with Trapezius IV to upwardly rotate the scapula Trapezius II
Origin: T1-T4 Trapezius III
Insertion: Upper margin of the spine of the scapula Trapezius III
Action: Adduction of the scapula Trapezius III
Origin: T5-T12 Trapezius IV
Insertion: Root of the spine of the scapula Trapezius IV
Action: Upward rotation of the scapula with Trapezius II; alone- depress the scapula Trapezius IV
Origin: Posterior surface of ilium between crest, posterior gluteal line and anterior gluteal line Gluteus Medius
Insertion: Oblique ridge and dorso-lateral surface of the greater trochanter Gluteus Medius
Action: Abducts with gluteus minimus; posterior fibers ER Gluteus Medius
Origin: Lateral condyle and upper 2/3rds of the lateral surface of the tibia Tibialis Anterior
Insertion: Plantar surface of base of the 1st metatarsal and medial surface of 1st cuneiform Tibialis Anterior
Action: Dorsi-flexion of ankle; supination (Adduction and Inversion) of foot Tibialis Anterior
Origin: Iliac crest and iliolumbar ligaments (ligaments connects iliac crest w/ transverse processes L4-L5) Quadratus Lumborum
Insertion: Last rib and the transverse processes of the upper four lumbar vertebrae. Quadratus Lumborum
Action: Bilateral they depress the ribs; one side alone produces ipsilateral flexion or stabilizes the pelvis when the ipsilateral foot is off the floor. Quadratus Lumborum
Origin: Transverse and costal processes of C2-C7 Scalenes - Anterior, Middle and Posterior
Insertion: Superior surface of rib 1 Scalenes - Anterior and Middle
Insertion: Superior surface of rib 2 Posterior Scalene
Action: From above, elevates the ribs; From below, forward flex neck; one side alone contract to ipsilaterally flex the neck. Scalenes - Anterior, Middle and Posterior
Origin: External and inferior borders of ribs 5-12 External Abdominal Oblique
Insertion: Via aponeurosis of the rectus abdominus to the linea alba from the ribs to the pubis, and anterior 1/2 of iliac crest External Abdominal Oblique
Action: Together - Compresses the abdomen and flexes the trunk; one side (force couple with contralateral internal oblique) acting from above contralaterally rotates and flexes lumbar vertebra to lift pelvis; Below rotates and flexes trunk. External Abdominal Oblique
Origin: Inner margins of the pubis Pubococcygeus
Insertion: Coccyx and median raphe (ligament where muscles attach to each other) Pubococcygeus
Action: Assists iliococcygeus and coccygeus to elevate and retract anus; medial fibers from the pubovaginalis and puboanalis and act as the sphincter urethrae Pubococcygeus
Origin: Outer surface or upper 9 ribs at the side of the chest. Serratus Anterior
Insertion: Anterior surface of the upper veterbal border through inferior angle of the scapula. Serratus Anterior
Action: Upper 1-4, 5 bands attaching to upper vertebral border abduct the scapula; Lower (4, 5-9) attached to inferior angle upwardly rotate; Together they hold the vertebral border of the scapula against the ribs Serratus Anterior
Created by: 1519275428
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