Shoulder Muscles Flashcards
Trapezius Entire Muscle Insertion
Lateral clavicle, acromion and spine of scapula
Trapezius Entire muscle Origin
Occiput, nuchal( thickened supraspinous) ligament (C1-C7) and SPs of C7-T12
Trapezius Entire Muscle Action
Retraction(adducts) scapula at scapulocostal joint
Upper Trapezius
External occipital protuberance, superior nuchal line and SP of C7
Upper Trapezius insertion
Lateral 1/3 of clavicle and acromion process of scapula
Upper Trapezius Action
Elevates scapula; laterally flexes and extends neck
Upper Trapezius Test
Subject: sit, head turned away from side being tested Fixation: none Test: elevate acromion and posterolaterally extend neck Pressure: against shoulder, in direction of depression and against head anterolaterally
Middle Trapezius Origin
SPs of T1-T3
Middle Trapezius Insertion
Acromion process and spine of Scapula
Middle Trapezius Action
Retracts the scapula
Middle Trapezius Test
Subject: Prone; arm abducted 90 and laterally rotated forearm extended. Fixation: place hand on opposite scapula. Test: retraction (adduction) of scapula. Pressure: against forearm, in downward direction toward floor protraction
Lower Trapezius Origin
SP’s T6-T12
Lower Trapezius Insertion
Root of spine of the scapula
Lower Trapezius action
Depression scapula
Lower Trapezius test
Subject: prone; arm abducted 120 and laterally rotated (palm forward); forearm extended. Fixation: place hand below opposite scapula. Test: adduction and depression of the scapula. Pressure: against of forearm, in downward direction toward floor protraction.
Rotator cuff muscles
Subscapularis, supraspinatus, infraspunatus, Teres minor
Sub SIT
Rhomboid major origin
SPs of T2-T5
Rhomboid Major insertion
Between the root of the spine of scapula and the inferior angle of the scapula
Rhomboid Major action
Retracts (adducts) and elevates scapula
Rhomboid Major/ minor test
Subject: prone; elbow flexed, arm adducted and slightly extended and laterally rotated; scapula elevated; palm up or down. Fixation: none. Test:adduction and elevation of scapula with medial rotation of inferior angle. Pressure: pull subjects elbow toward you ( abduction and lateral rotation of inferior angle) other hand on shoulder, in direction of scapula depression.
Rhomboid minor origin
SPs of C7-T1
Rhomboid minor insertions
Root of the spine of scapula
Rhomboid Minor action
Retracts ( adducts) and elevated; palm up nor down
Pectoralis Major origin
Entire muscle: medial clavicle, sternum and costal cartilage of ribs 1-7 Clavicular Head: anterior surface of medial 1/2 of clavicle. Sternocostal head: anterior sternum, costal cartilage of ribs 1-7
Pectoralis Major insertion
Lateral lip of bicipital groove of humerus ( crest of the greater tubercle of humerus.
Pectoralis Major Action: adducts and medically rotated arm at shoulder
Clavicular head: flexes, medically rotates and horizontally adducts arm at should
Sternocostal head: depresses shoulder girdle; obliquely adducts arm (toward ilium)
Adducts and medically rotated arm at shoulder
Clavicular head: flexes, medically rotates and horizontally adducts arm at should
Sternocostal head: depresses shoulder girdle; obliquely adducts arm (toward ilium)
Pectoralis Major Test ( Clavicular head upper portion)
Subject: supine; arm flexed 90 degrees and slightly medically rotated; forearm extended and neutral. Fixation: with one hand, keep opposite shoulder on the table
Test: horizontally adduct arm 45 at shoulder ( straight across chest)
Pressure: against forearm, in direction of horizontal abduction ( toward examiner)
Pectoralis Major sternocostal head (lower portion)
Subject: supine; arm flexed 45 and slightly medically rotated; forearm extended and neutral
Fixation: with one hand, keep opposite ilium on the table crest
Pressure: Against forearm obliquely, lateral and cranial direction
Deltoid( anterior fibers origin)
Anterior and superior surfaces of lateral 1/3 of clavicle
Deltoid ( middle fibers)
Lateral margin and superior surface of acromion.
Deltoid (posterior fibers) origin
Posterior border of spine of scapula
Deltoid Insertion
Deltoid tuberosity of the humerus
Deltoid anterior fibers action
Anterior: flex arm and medically rotate arm ( when supine)
Deltoid middle fibers action
Abduct arm ( stabilized by anterior and posterior fibers)
Deltoid posterior fibers action
Extends arm and laterally rotate arm( when prone)
Deltoid middle fibers test
Subject: sit; arm abducted 90 without rotation (Palm facing floor) +/-
Fixation: none
Pressure; against distal humerus ( or forearm if extended), in direction of adduction
Deltoid anterior fibers test
Subject: sit; forearm flexed 90; arm abducted 90 in slight flexion and lateral rotation.
Fixation: as pressure is applied, apply counter pressure to posterior shoulder
Pressure against anteromedial arm; toward adduction and arm extension
Deltoid posterior fibers test
Subject: sit; forearm flexed 90; arm abducted in slight extension and medial rotation
Fixation: as pressure is applied, apply counter pressure to anterior shoulder
Pressure: against posterolaterally arm; toward adduction and arm flexion
Serratus Anterior Origin
Anterolateral portion of ribs 1-9; individual slips
Serratus anterior insertion
Anterior/ costal surface of medial border of scapula
Serrated anterior action
Protracts and upwardly/ laterally rotates scapula, holds scapula against posterior rib cage
Serrated anterior test
Subject: sit; arm flexed to 120; forearm extended and pronate
Fixation: none required; subject may hold onto table with opposite hand
Test: maintain position against pressure
Pressure: from side, one hand on top of mid arm, in direction of extension
Other hand- slight pressure medially, toward medial rotation of inferior angle
Latissimus Dorsi origin
Spinous process of T7-L5, posterior sacrum and posterior iliac crest
Latissimus Dorsi insertion
Medial lip of bicipital groove of humerus
Latissimus Dorsi action
Medially rotates, adducts and extends arm at the shoulder
Latissimus Dorsi Test
Subject: Prone; arm adducted, medially rotated and extended 20 forearm neutral; palm facing across butt
Fixation: apply counter pressure against opposite pelvis
Test:maintain position against pressure
Pressure: Against forearm, in direction of abduction
Teres Major Origin
Inferior lower 1/3 lateral border of the scapula
Teres major insertion
Medial lip/ crest of the bicipital groove of Humerus ( below lesser tubercle)little brother of latissimus dorsi: run together, direction, action
Teres Major Action
Medially rotates, adducts and extends arm at shoulder
Teres Major test
Subject prone ; back of hand resting on poser tiro iliac crest ( arm medially rotated)
Extension and adduction of humerus
Pressure: against distal arm, in direction of abduction and flexion
Supraspinatus Origin
Medial 2/3 of supraspinous fossa of scapula ( deep to trapezius)
Supraspinatus Insertion
Under acromion to superior facet of greater tubercle of humerus
Supraspinatus action
Abducts the arm
Supraspinatus test
Sit head extended and laterally flexed toward tested side and face rotated toward opposite side forearm flexed 90 arm abdicated 90 in slight flexion( horizontal adduction) and slight lateral rotation ( forward of coronal plane)
Pressure: Against elbow/ forearm; indirection of adduction ( and slight medial rotation
Infraspunatus Origin
Medial 2/3 of infraspinous fossa of scapula
Infraspinatus Insertion
Middle facet of greater tubercle of humerus( tendon wraps around posterior humerus- lateral rotation
Infraspinatous action
Laterally rotates arm
Infraspinatous test
Prone forearm flexed 90 arm abducted 90 elbow off the table “hi”
Test: hold position against pressure
Pressure: on forearm, applied in direction of floor
Teres MInor Origin
Superior 2/3 of lateral border of scapula
Teres MInor Insertion
Greater tubercle( inferior facet) of humerus tendon wraps around posterior humerus
Teres minor action
Lateral rotates arm
Teres Minor Test
Subject: supine; arm at side; forearm flexed 90 and neutral
Fixation: pressure applied on medial elbow to insure rotation
Test: hold position against pressure
Pressure; on posterior distal forearm in direction of medial rotation