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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