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A � O � I � � Posterior View
Latissimus dorsi � Trail Guide, Page 71 � Latissimus dorsi is a broad, thin, superficial muscle of the low back. � The name means “widest of the back”. � This image only shows the right side, but the full muscle is bilateral. � Bilateral Having two sides. � The abbreviation is Lat. � Posterior View �
Teres major � Trail Guide, Page 71 � Teres major is called “lat’s little helper” because they are complete synergists. � Synergist Muscle that aids movement by contracting at the same time as the prime movers. � Although the teres major and teres minor share the same first name, they rotate the arm in opposite directions. � What actions are performed by the lats and teres major? � Posterior View �
Actions of the lats and teres major � Glenohumeral extension Glenohumeral adduction Glenohumeral medial rotation Posterior View � Posterior View �
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A � O � I � � Posterolateral View
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A � O � I � � Posterolateral View
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A � O � I � � � Posterior View Anterior View
A � O � I � � � Posterior View Anterior View
Bony Landmarks of the Humerus � Trail Guide, page 50 � Head of the humerus � Greater tubercle � Lesser tubercle � Crest of the greater tubercle � Crest of the lesser tubercle � Intertubercular groove � Deltoid tuberosity � � Anterior View
Venn diagram � (common details graph) � Actions: � Latissimus dorsi � Teres major � G/H extension � G/H adduction � Origins: � Origins: � G/H medial � Thoracic spinous processes � Lower one-third of lateral � rotation � Last 3-4 ribs � border of the scapula � Thoracolumbar aponeurosis � Origin: � Posterior iliac crest � Inferior angle � of scapula � Insertion: � Proximal, anterior � humerus �
A � O � I � � Posterior View
Rhomboid Major and Minor � Trail Guide, Page 82 � The rhomboids are named for their geometric shape. � A rhombus is a parallelogram with oblique angles and only the opposite sides are of equal length. � They are located between the scapula and the vertebral column. � Posterior View � Posterior View � When do you use your rhomboids? �
Actions of the rhomboids � Scapulothoracic Scapulothoracic adduction downward rotation Scapulothoracic elevation Rhomboid major � Rhomboid minor � � Posterior View � Posterior View
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