Lect16_jt_musc_shoulder_notess

Lect16_jt_musc_shoulder_notess - Lecture 16 Outline...

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Unformatted text preview: Lecture 16 Outline Shoulder and Upper Arm Musculature Scapulothoracic muscles affect scapular motion and stability Scapulohumeral muscles affect glenohumeral motion and stability of glenohumeral joint Humerothoracic muscles affect glenohumeral and scapular motion and stability Shoulder Musculature Brief review of scapula and glenohumeral motion description motions of the scapula and glenohumeral joint are often coupled the overall motion is a result of combined movement of the scapula and glenohumeral joint because of the limited bony connection of the shoulder girdle, coordinated actions are needed for stabilization and motion, e.g., scapula often has to be stabilized for glenohumeral movements Brief review of motion description Shoulder (glenohumeral) joint sagittal plane flexion extension Shoulder Musculature frontal plane transverse plane Brief review of motion description Scapular motion primarily frontal plane movement elevation depression Shoulder Musculature elevation depression retraction protraction up rot dn rot protraction (abduction, lateral translation) away midline retraction (adduction, medial translation)towards midline upward rotation Scapulothoracic muscles muscles that typically have an origin in the thoracic region and insert on the scapula affect scapular motion and stability Muscle : Pectoralis minor Origin : ribs 2-5 Insertion : corcoid process on scapula Action : scapular depression and downward rotation, protraction, and elevation of the ribs Innervation : C8 and T1 spinal nerves Description : smaller, flat muscle deep to pec major Scapulothoracic Muscles Muscle : Pectoralis minor Origin : ribs 2-5 Insertion : Action : scapular depression and downward rotation, protraction, and elevation of the ribs Innervation : C8 and T1 spinal nerves Description : smaller, flat muscle deep to pec major Scapulothoracic Muscles Muscle : Serratus anterior Origin : ribs 1-8 Insertion : medial margin of the scapula Action : scapular protraction (abduction); also can be an important stabilizer of scapula Innervation : C5-C7 spinal nerves Description : runs antero-lateral to posterior Scapulothoracic Muscles...
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Lect16_jt_musc_shoulder_notess - Lecture 16 Outline...

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