Shoulder (Outline 14) Flashcards by luan nguyen

Nerve Innervation to shoulder?

Blood supply?

brachial plexus (anterior rami of C5-T1)

branches of subcalvan and axiallries

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Muscles of shoulder?

Direct to Humerus

Extrinsic

Intrinsic

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Extrinsic muscle?

movement of shoulder girdle in relative to axial skeleton (attachment of shoulder girdle with vertebrae)

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Intrinsic muscle

Movement free limbs relative to the shoulder girdle

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What are the anterior extrinsic muscle?

subclavius

pec minor

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What are the posterior extrinsic muscle?

levaetor scapula

trapezius

rhomboid major/minor

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What part of muscle is the serratus anterior in?

extrinsic muscle of shoulder

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What are the intrinsic muscles?

SITS ( supraspinatus, infaspinatus, teres minor, subscapularis)

teres major

deltoids

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OIANB of supraspinatus?

Supraspinous fossae of scapula

top of greater tubercle of humerus

abduction of humerus/ stabilize head of humerus

suprascapular N

suprascapular A

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OIANB of infraspinatus?

infraspinous fossa of scapula

middle facet of greater tubercle of humerus

lateral rotation/ extension of humerus

suprascapular N

suprascapular A

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OIANB of teres minor

Upper 2/3 of dorsal surface of axillary border of scapula

lower facet of greater tubercle of humerus

lateral rotation

axiallary nerve

post humerus circumflex a

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OIANB of subscapularis

lesser tubercle of humerus

internal rotation

Upper/Lower subscapular N
Circumflex Scapular A

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OIANB of teres major

posterior surface of inferior border of scapula

medial lip of intertubercular groove of humerus

lateral rotation and extension of humerus

lower subscapular nerve

circumflex scapular artery

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OIANB of deltoids

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What are the muscles in common that attach to poster ior vertebral/medial border of scapula

levator scapula. rhomboid major/minor

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What does deltoids and trapezius have in common?

lats & major in common?

deltoids & teres minor

Rhomboids & Levator Scapulae

origin and insertion

same actions

Axillary N and PHCA

Dorsal Scapular N + A

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Name muscle in Pink/Green/Yellow

What do they have in common?

Levator Scapulae

Rhomboid Minor

Rhomboid Major

Dorsal Scapular A+N

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What does subscapularis and teres major have in common?

Circumflex Scapular Artery

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What muscles have lateral rotation of humerus?

teres minor

infraspinatus

teres major

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What are the joints in shoulder

Sternoclavicular

Acromioclavicular

Glenohumeral

Scapulothoracic

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What joint of shoulder is pseudo?

scapulathoracic

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Motion of scapularthoracic joint

Elevation/Depression

Protraction/Retraction

Rotation

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Muscles involved in Elevation of scapularthoracic joint

Muscles involved in Depression of scapularthoracic joint

Upper Trapezius/ Levator Scapulae

Lower Traps/ Pec Minor

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Muscles involved in Protraction of scapularthoracic joint

Muscles involved in Retraction of scapularthoracic joint

Pec Minor/ Serratus Anterior

Rhomboids/Middle Trapezius

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Scapulathoracic Joint

joint between scapula and thorax

Sternoclavicular Joint

Joint between sternum (clavicular notch of manubrium) and clavicle (proximal end of clavicle)

What connect between proximal end of clavicle and clavicular notch of manubrium

articular disk

What does fibrous capsule do in sternoclavicular joint?

surround the joint capsule and perimeter of articular disk

What are major ligaments in sternocalvicular joint?

anterior/posterior sternoclavicular lig costoclavicular interclavicular

Describe ant/post sternoclavicular lig costoclavicular lig interclavicular

between sternum and clavicular between medial inferior border of clavicle and costal cartilage 1st ribs between clavicles

Blood supply for sternoclavicular joint?

clavicular branch of thoracoacromial trunk internal thoracic inferior thyroid branch of thyrocervical trunk

Function of ant/post sternoclavicular lig costoclavicular lig interclavicular lig

blended in with joint capsule to reinforce the joint prevent the clavicle pop up during depression/elevation prevent the clavicle pop out during protraction

Nerve supply for sternoclavicular joint?

supraclavicular nerve branches

What type of joint is sternoclavicular?

diathroses/plane joint (it has joint capsule - synovial joint)

Acromioclavicular joint connects which structures?

Between the distal end of the clavicle and the acromion process of the scapla.

Movements of acromicoclavicular joint are associates with what?

Acromioclavicular joint Reinforced by two ligaments

acromio-clavicular lig coracoclavicular lig

Acromio-clavicular ligament

completely surround and reinforce joint capsule

Coracoclavicular ligament? Property? Function?

connect coracoid process up to inferior side of distal end of clavicle Strong ligament to resist lots of force Keep the clavicle down and close to scapula

scapular rotation will result in movement of what joint in shoulder?

acromioclavicular joint

Acromioclavicular joint nerve supply

suprascapular, axillary, and petoral nerves

Blood supply for acromioclavicular joint?

acromial rete

what contribute ot the acromial rete?

thoracoacromio trunk (deltoid, acromion artery)

Character of glenohumeral Joint

the glenoid fossa doesn't match up with size and curvature of the head of the humerus

Glenoid labrum

the fibrocartilage rim that on the glenoid fossa

what is the characteristic of the joint capsule in glenohumeral joint?

its lose and doesn't give stability as other

Glenohumeral joint ligaments?

coracohumeral ligament glenohumeral lig transverse lig

Coracohumeral ligament

connects coracoid process with the greater tubercle of humerus (reinforce superior joint capsule)

Glenohumeral Lig

connect the rim of glenoid fossa to surgical neck of humerus (reinforce the anterior joint capsule)

transverse ligament Function?

doesn't reinforce and connect the medial and lateral lip intertubercular groove of humerus hold the tendon of long head bicep

What other structures are crucial to stabilize and reinforce glenohumeral joint?

tendinous cuff coracoacromial arch

Tendinous cuff

Muscles that stabilize the glenohumeral joint

Border of tendinous cuff (rotator cuff)

Anterior: subscapularis Posterior - Superior: supraspintus Post-Middle: Infraspinatus Post-Inf: Teres minor

Characteristics of muscle tendons?

dynamic stabilities because they can contract

95% dislocation of glenohumeral joint is where?

anterior- inferior

What does the coracoacromial arch prevent?

prevent humerus from moving superiorly

Bursae involved in glenohumeral joint?

subacromial-subdeltoid supscapularis

subacromial-subdeltoid bursae

between supraspinatus tendon and acromial process (coracoacromial ligament) between deltoid muscle and humerus

subscapularis bursae

between the neck of glenoid fossa and subscapularis

BS for glenohumeral joint

suprascapular & 2 circumflex humeral artery

Nerve supply to glenohumeral joint?

axillary suprascapular nerve

What joint also move when glenohumeral joint move? How is the ratio of these two joints in relation?

scapulothoracic joint Glenohumeral joint:Scapulothoracic (2:1)

What muscle is without can't initiate the abduction of shoulder?

supraspinatus

0-90 degree abduction/adduction

glenohumeral joint mostly

What part of deltoid that responsible for abduction?

middle deltoid

At 120 abduction, what happens? Due to what?

the glenohumeral joint is locked due to the lateral conjuct rotation of the humerus in glenoid fossa

Does deltoid do anything with the lateral rotation of the humerus? Then why?

No. All it does is to abduct with power. the rotation is due to the shape of the articular surface

From 120-180 degree, what joint responsible for abduction?

scapularthoracic joint

What is the movement of scapula during 120-180 abduction?

upward rotation

What miuscles responsible for upward rotation of scapula?

serratus anterior upper/lower part of trapezius

What muscles responsible for adduction of shoulder?

lats/teres major and pec major

Muscle for shoulder abduction

supraspinatus middle deltoid

Muscles for adduction

pec major teres major/ lats

Muscles for flexion Extension

Anterior Deltoid/Pec major/Coracobrachialis/Short head of Bicep Brachii Teres Major/ Post Deltoid/Lats

Muscles for Internal rotation external rotation

Subscapularis/ Teres Major/Lats/Anteriod deltoid Post Deltoid/Infraspinatus/Teres MInor

Quadriangle Space Border

Superior: Teres Minor Inferior: Teres Major Medial: Long head triceps lateral: humerus

What contents are in the quadrangular space?

posterior humerus circumflex artery axillary

Triangular Border

Sup: Teres Minor Inf: Teres Major Lateral: Long head triceps

Contents in triangular space?

circumflex scapular artery

What does suprascapular N supply?

supraspinatus infraspinatus glenohumeral joint acromialclavicular joint

Damage to long thoracic nerve results in?

wing scapula serratus anterior damage -\> scapula rotation

What does axillary N supply to? Damage this nerve will result in what motion?

Deltoids/ Teres minor acromioclavicular joint external rotation/ Abduction