Kinesiology 2236A/B Lecture Notes - Lecture 13: Latissimus Dorsi Muscle, Rotator Cuff, Teres Minor Muscle
17 Jan 2018
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With movement it is like balancing on a seal"s nose. Static: labrum, capsule, glenohumral ligaments, improve range of motion, improve stability. What drives the scapular movement: upper trapezius, lower trapezius, serratus anterior, biceps, latissimus dorsi, rhomboids, middle trapezius, levator scapula, deltoid. Normal movement patterns: remember the seal with the ball on its nose, setting phase, initial 30 degrees the scapular does not move as the scapular establishes a stable base, 2:1 ratio between the humerus and scapula. < 90 degrees spine of scapula upper fibers (serratus ant) > 90 ac joint - lower fibers to keep nose under ball. Dynamic stabilizers - rotator cuff: subscapularis, supraspinatus. We need force couples at the gh joint. Supraspinatus- pulls up to drop head down: orientation of rotator cuff: down. Deltoid= supraspinatus + teres minor+ infraspinatus + subscap. If poor rc function- translatory force of deltoid.
