KIN 245 Chapter 5: The Shoulder Joint
Pectorals Major upper fibers
-Origin: medial half of the anterior surface of clavicle -Insertion: flat tendon 2 to 3 inches wide to lateral lip of inter tubercular groove of humerus - action: internal rotation, horizontal adduction, diagonal adduction, flexion and abduction
Rotator cuff muscles
-Supraspinatus: attach to greater tubercle from above (abduct) -Infraspinatus: attach to greater tubercle posteriorly (ext. rot) -Teres Minor: attach to greater tubercle posteriorly (ext. rot) -Subscapularis: attach to lesser anterior (int. rot)
Supraspinatus muscle
-abduction -stabilization of the humeral head in glenoid fossa
Latissimus Dorsi muscle
-adduction -extension -internal rotation -horizontal abduction
Deltoid muscle
-anterior fibers: abduction, flexion, horizontal adduction and internal rotation -middle fibers: abduction -posterior fibers: abduction, extension, horizontal abduction and external rotation
Teres Major
-extension, flexed position to the posteriorly extended position -adduction, the abduction position down to the side and toward midline of body -internal rotation
Infraspinatus muscle
-external rotation -horizontal abduction -extension -stabilization of humeral head in the glenoid fossa
Teres Minor muscle
-external rotation -horizontal abduction -extension -stabilization of humeral head in the glenoid fossa
Coracobrachialis muscle
-flexion -adduction -horizontal adduction
Humeral landmarks
-head -greater tubercle -lesser tubercle -intertubercular groove -deltoid tuberosity
Subscapularis muscle
-internal rotation -adduction -extension -stabilization of the humeral head in the glenoid fossa
Pectorals major lower fibers
-origin: anterior surface of costal cartilages of first six ribs and adjoining portion of sternum -insertion: flat tendon 2 or 3 inches wide to lateral lip of inter tubercular groove of humerus -action: internal rotation, horizontal adduction, diagonal adduction, extension from flexed posititon and adduction
subscapularis
-origin: entire anterior surface of sub scapular fossa -insertion: lesser tubercle of humerus -action: internal rotation, adduction, extension
deltoid posterior fibers
-origin: inferior edge of spine of scapula -insertion: deltoid tuberosity on lateral humerus -action: abduction, horizontal abduction, external rotation, diagonal abduction
infraspinatus
-origin: infraspinous fossa just below spine of scapula -insertion: posteriorly on greater tubercle of humerus -action: external rotation, horizontal abduction, extension, diagonal abduction
deltoid middle fibers
-origin: lateral aspect of acromion -insertion: deltoid tuberosity on lateral humerus -action: abduction, horizontal abduction
supraspinatus
-origin: medial two-thirds of supraspinous fossa -insertion: superiorly on greater tubercle of humerus -action: abduction
latissimus dorsi
-origin: posterior crest of ilium, back of sacrum and spinous processes of lumbar and lower six thoracic vertebrae, slips from lower three ribs -insertion: medial side of inter tubercular groove of humerus, just anterior to the insertion of the theres major -action: extension, adduction, internal rotation, horizontal abduction
Teres major
-origin: posteriorly on inferior third of lateral border of scapula and just superior to inferior angle -insertion: medial lip of inter tubercular groove of humerus, just posterior to the insertion of the latissimus dorsi -action: extension, adduction, internal rotation
teres minor
-origin: posteriorly on upper and middle aspect of lateral border of scapula -insertion: posteriorly greater tubercle of humerus -action: external rotation, horizontal abduction, extension, diagonal abduction
deltoid anterior fibers
-origin:anterior lateral third of clavicle -insertion: deltoid tuberosity on lateral humerus -action:abduction, flexion, horizontal adduction, internal rotation, diagonal adduction
rotator cuff group
-subscapualirs -supraspinatus -infraspinatus -tere minor
Scapular landmarks
-supraspinous fossa -infraspinous fossa -subscapular fossa -spine of the scapula -glenoid cavity -coracoid process -acromion process -inferior angle
Horizontal abduction
-transverse extension -movement of humerus in a horizontal or transverse plane away from chest
Horizontal adduction
-transverse flexion -movement of humerus in a horizontal or transverse plane toward and across chest
Pectorals Major Muscle
Upper fibers (clavicular head): internal rotation, horizontal adduction, flexion, abduction and adduction Lower fibers (sternal head): internal rotation, horizontal adduction, extension and adduction
deltoid anterior fibers primary movement include ______, flexion, horizontal adduction, internal rotation and diagonal adduction
abduction
the deltoid middle fibers primary movements include ____ and horizontal abduction
abduction
action common to the latissimus doors, theres major, and lower pectoralis major is _____
adduction
coracobrachialis primary movements include horizontal and diagonal _____
adduction
not action of the pectoralis minor muscle
adduction
Action of the latissimus doors muscle
both internal rotation and extension
the pectoralis major upper fibers have the following origin: medial half of the anterior surface of the _____
clavicle
Adduction
downward movement of humerus medially toward body from abduction
an action common to the latissimus doors, teres major, and lower pectorals major is
extension
action common to the posterior deltoid, theres minor and infraspinatus is
external rotation
T/F: the insertion of the deltoid muscle is the humeral tuberosity on the lateral humerus
false
the pectorals major upper fibers primary movement include internal rotation, horizontal adduction, diagonal adduction _____ and adduction
flexion
latissimus dorsi has the following _______: medial side of the inter tubercular groove of the humerus, just anterior to the attachment for the theres major
insertion
movement of the humerus in the transverse plane medially around its long axis toward the midline is termed
internal rotation
the pectoralis major lower fibers have the following insertion: flat tendon two or three inches wide to ____ lip of the intertubercular groove of the humerus
lateral
theres minor has the following origin: posteriorly on the upper and middle aspect of the ____ of the scapula
lateral border
the coracobrachialis has the following insertion: middle of the ____ border of the humeral shaft
medial
insertion of the latissimus dorsi muscle
medial lip of the inter tubercular groove of the humerus
Diagonal abduction
movement of humerus in a diagonal plane away from midline of body
Diagonal adduction
movement of humerus in a diagonal plane toward midline of body
Externa rotation
movement of humerus laterally around its long axis away from midline
Internal rotation
movement of humerus medially around its long axis toward midline
Flexion
movement of humerus straight anteriorly
Extension
movement of humerus straight posteriorly
the latissimus dorsi has the following _____: posterior crest of the ilium , back the sacrum and spinous processes of the lumber and lower six thoracic vertebrae, and the slips from the lower three ribs
origin
coracobrachialis
origin: coracoid process of scapula -insertion: middle of medial border of humeral shaft -action: horizontal adduction, diagonal adduction
the pectoralis major lower fibers have the following origin: anterior surface of the costal cartilages of the first six ribs and adjoining portion of the ____
sternum
the _____ has the following origin: entire anterior surface of the subscapular fossa
subscapualris
not an anterior muscles of the shoulder joint
supraspinatus
not anterior muscle of the shoulder joint
supraspinatus
not considered to be a muscle in the rotator cuff group
teres major
T/F: glenohumeral joint stability is enhanced by the glenoid labrum
true
T/F: insertion of the pectoralis major muscle is the flat tension 2-3 inches wides to the outer lip of the inter tubercular groove of the humerus
true
T/F: one of the functions of the supraspinatus muscle is to stabilize the humeral head in the glenoid fossa
true
T/F: origin of the deltoid muscle includes the anterior lateral third of the clavicle and the lateral portion of the accordion process
true
T/F: origin of the deltoid muscle includes the anterior lateral third of the clavicle and the lateral portion of the acromion process
true
T/F: origin of the pectorals major muscle includes the portion of the sternum adjacent to the costal cartilages of the first 6 ribs
true
T/F: subscapularis action is opposed by the infraspinatus
true
T/F: the origin of the deltoid muscle includes the anterior lateral third of the clavicle and the lateral portion of the accordion process
true
T/F: when attempting extreme external rotation the total shoulder range of motion is enhanced by scapula adduction
true
subscapularis action is opposed by the infraspinatus
true
the infraspinatus has the following insertion: posteriorly on the greater _____ of the humerus
tubercle
the supraspinatus has the following insertion: superiorly on the greater _____ of the humerus
tubercle
Abduction
upward lateral movement of humerus out to the side, away from body
