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Worsham Anatomy Lab

Verbal Questions for Worsham Anatomy Lab at Morgue

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
Created by: Scrummy