Muscles Of The Shoulder PDF

Muscles connecting Scapula with Humerus (Muscles of the shoulder)  Muscles connecting Scapula with Humerus (Muscles of the shoulder) Clinical Anatomy by Regions 9th ed. - R. Snell (Lippincott,2012 chapter 9 / page 349 ) Learning Objectives 1 Identify shoulder muscles 2 K...

Muscles connecting Scapula with Humerus (Muscles of the shoulder)  Muscles connecting Scapula with Humerus (Muscles of the shoulder) Clinical Anatomy by Regions 9th ed. - R. Snell (Lippincott,2012 chapter 9 / page 349 ) Learning Objectives 1 Identify shoulder muscles 2 Know shoulder movements 3Identify Rotator cuff muscles 3- Know subacromial bursa Deltoid tuberosity Shoulder Muscles 1. Deltoid 2. Supraspinatus 3. Infraspinatus 4. Teres minor 5. Teres Major 6. Subscapularis Deltoid Origin (Opposite insertion of trapezius) Anterior border of lateral half of the Clavicle Lateral border of acromion Lower border of spine of scapula Insertion Deltoid tuberosity Nerve supply: Axillary nerve. Action: 1 Anterior fibers flexes and medial rotates the arm. 2 Middle fibers Abductor of the arm (15-90). 3 Posterior fibers extents & laterally rotates the arm.  Deltoid muscle paralysis Atrophy of the shoulder Unable to abduct the arm to 90 Supraspinatus Origin Supraspinous fossa Insertion Greater tuberosity of the humerus ( upper impression) Nerve supply: Suprascapular nerve. Action: Initiates abduction of the arm (from 0-15) Infraspinatus Origin Infraspinous fossa Insertion Greater tuberosity of the humerus ( Middle impression) Nerve supply: Suprascapular nerve Action: Lateral rotation of the arm Teres Minor Origin Dorsal aspect of Lateral border of the scapula (upper 2/3 thirds) Insertion Greater tuberosity of the humerus (lower impression). Nerve supply: Axillary Nerve. Action: Adduction and lateral rotation of the arm. Teres Major Origin Dorsal surface of the scapula above the inferior angle. Insertion Medial lip of bicipital groove. Nerve supply: lower subscapular nerve. Action: Adduction, medial rotation. Subscapularis Origin Subscapular Fossa Insertion Lesser Tuberosity. Nerve supply: Upper and lower subscapular nerves. Action: Adduction and medial rotation of the arm.  Origin and insertion for shoulder muscles MUSCLE ORIGIN INSERTION Deltoid Opposite insertion of Deltoid tuberosity trapezius Supraspinatu Supraspinous fossa Greater Tuberosity s Infraspinatou Infraspinous fossa Greater Tuberosity s Teres minor Dorsal,lateral Greater Tuberosity ,scapula Teres major Dorsal,inferior angle Medial lip bicipital ,scapula grove Subscapularis Subscapular fossa lesser Tuberosity  Nerve supply and action for shoulder muscles Supraspinatus (ABDUCTION) Suprascapula Infraspinatus (Lateral Rotation) Nerve Teres minor ((Lateral Rotation) Axillary Nerve Deltoid (ABDUCTION) Subscapu Subscapular Nerve laris Teres major ( Media l  Identify the labelled muscles 1. Supraspinatus 2. Infraspinatus 3. Teres minor 4. Teres Major  Rotator Cuff They are muscles attached to greater and lesser tuberosities. They blends with capsule of shoulder joint to strength it. 1. Supraspinatus 2. Infraspinatus 3. Teres minor 4. Subscapularis Rotator cuff Tendinitis Symptoms : pain and swelling in the shoulder area, limited motion or weakness of the arm. It occurs mostly in athletes playing sports that require lifting their arm over their head as: ❑ swimmer’s shoulder ❑ pitcher’s shoulder ❑ tennis shoulder Pitcher’s shoulder Subacromial Bursa  Situated Between 1- Above a) Coracoacromial b) Deltoid Muscle arch 2-Below b) Greater tuberosity a) Supraspinatus Function tendon 1-Protection (supraspinatus) 2-Helping (Abduction) Supraspinatus tendon Coracoacromial arch Subacromial Bursitis  Dawbarn's test Arm by side Pain Right angle abduction No Pain  Abduction of The Arm A- Zero -90 degree (movement of the humerus ) 1. From Zero to 15 :Supraspinatus 2. From 15 -90 : Deltoid B-From 90-180 degree ( Rotation of scapula) 3. Trapezius 4. Serratus Anterior