Verbal Questions for Worsham Anatomy Lab at Morgue
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Definition of Pectoralis Major | Large, fan-shaped muscle covering upper portion of chest; forms anterior Axillary fold; divided into clavicular and sternal parts
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| Origin of Pectoralis Major | Sternal end of clavicle, sternum, cartilage of ribs 1-6, and the aponeurosis of external oblique muscle
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| Action of Pectoralis Major | Prime mover of arm flexion, draws the shoulder forward
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| Insertion of Pectoralis Major | Crest of the greater tubercle of the humerus
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| Definition of Latissimus Dorsi | Broad, flat, triangular muscle of the lower back (lumbar region); extensive superficial origins; covered by trapezius superiorly; contributes to the posterior wall of axilla
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| Origin of Latissimus Dorsi | Indirect attachment into the spines of the lower six thoracic vertebra, all lumbar vertebrae, lower 3 to 4 ribs, and the iliac crest
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| Action of Latissimus Dorsi | Pulls the arm down and backward, i.e. rowing action
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| Insertion of Latissimus Dorsi | Intertubercular groove of the humerus
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| Definition of Trapezius | Most superficial muscle of the superior thorax; flat, and triangular in shape; upper fibers run inferiorly to scapula; middle fibers run horizontally to scapula; lower fibers run superiorly to scapula
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| Origin of Trapezius | Occipital bone, ligamentum nuchae, the spines of C7 and all thoracic vertebrae
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| Action of Trapezius | Pulls on the shoulder joint and draws the head back
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| Insertion of Trapezius | A continuous insertion along the acromion and spine of scapula and the lateral one-third of the clavicle
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