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