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Worsham Anatomy Lab
Verbal Questions for Worsham Anatomy Lab at Morgue
Question | Answer |
---|---|
Definition of Pectoralis Major | Large, fan-shaped muscle covering upper portion of chest; forms anterior Axillary fold; divided into clavicular and sternal parts |
Origin of Pectoralis Major | Sternal end of clavicle, sternum, cartilage of ribs 1-6, and the aponeurosis of external oblique muscle |
Action of Pectoralis Major | Prime mover of arm flexion, draws the shoulder forward |
Insertion of Pectoralis Major | Crest of the greater tubercle of the humerus |
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 |
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 |
Action of Latissimus Dorsi | Pulls the arm down and backward, i.e. rowing action |
Insertion of Latissimus Dorsi | Intertubercular groove of the humerus |
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 |
Origin of Trapezius | Occipital bone, ligamentum nuchae, the spines of C7 and all thoracic vertebrae |
Action of Trapezius | Pulls on the shoulder joint and draws the head back |
Insertion of Trapezius | A continuous insertion along the acromion and spine of scapula and the lateral one-third of the clavicle |