anterior shoulder region joints

articulation of the sternoclavicular joint

sternal facet of the clavicle and the manubrium of sternum

sternoclavicular joint type

saddle synovial joint

intrinsic reinforcing ligaments of the sternoclavicular joint

• superior: interclavicular ligament

• anterior sternoclavicular ligament

• posterior sternoclavicular ligament

what does the interclavicular ligament do

reinforce the joint superiorly

what does the anterior sternoclavicular ligament do

reinforce joint capsule anteriorly

what is the extrinsic reinforcing ligament of the sternoclavicular joint

• costoclavicular ligament

what is the purpose of the costoclavicular ligament

resist elevation

what does the costoclavicular ligament attach to

the first rib and costal cartilage

what is a unique feature of the sternoclavicular joint

it has two cavities separated by an articular disc made of fibrocartilage- resists compression

very strong, less likely to dislocate, more likely to fracture clavicle

allows for fuller range of motion in the upper extremity

sternoclavicular joint motions

protraction, retraction, elevation and depression of the clavicle (when the clavicle moves the scapula moves)

what is the promary protractor of the clavicle

serratus anterior

what is the primary retractor of the clavicle

middle part of the trapezius

what is the primary elevator of the clavicle

superior part of the trapezius

what is the primary depressor of the clavicle

gravity

what are the synergists of protraction of the clavicle

pectoralis major and minor

what are the synergists for retraction of the clavicle

rhomboids major, minor, and the latissimus dorsi

what are the synergists for elevation of the clavicle

levator scapulae, rhomboids major and minor

what are the synergists for depression of the clavicle

inferior trapezius, pectoralis major and minor, serratus anterior, latissimus dorsi

articulation of the acromioclavicular joint

acromial facet of the clavicle with the acromion of the scapula

acromioclavicular joint type

plane synovial

unique feature of the acromioclavicular joint

incomplete fibrous articular disc

intrinsic reinforcing ligament of the acromioclavicular joint and function

acromioclavicular joint - reinforce the joint superiorly

extrinsic reinforcing ligament and function

coracoclavicular ligament- resists depression of the scapula away from the clavicle

where does the coracoclavicular ligament span

form the coracoid process to the undersurface of the clavicle

articulations of the glenohumeral joint

head of humerus with the glenoid fossa of the scapula

glenohumeral joint type

ball in socket synovial

intrinsic reinforcing ligaments of the glenohumeral joint

coracohumeral ligament, superior, middle, inferior glenohumeral ligaments, transverse humeral ligament

span of coracohumeral ligament

base of the coracoid process to the greater tubercle of the humerus

span of superior, middle, and inferior glenohumeral ligaments

glenoid labrum to the humerus

span of the transverse humeral ligament

greater tubercle to lesser tubercle

extrinsic ligament of the glenohumeral joint

coracoacromial ligament

span of coracoacromial ligament

coracoid process to the acromion

function of the coracoacromial ligament

resist superior displacement of the humerus

unique feature of the glenohumeral joint

glenoid labrum around the glenoid fossa acts like a suction cup to the humerus

loose inferiorly to allow for movement

primary flexors of the glenohumeral joint

anterior deltoid and pectoralis major

synergist of flexors of the glenohumeral joint

coracobracholais and biceps brachii

primary extensors of the glenohumeral joint

posterior deltoid

synergists of the extensors of the glenohumeral joint

long head of triceps brachii, latissimus dorsi and teres major

what are the movements of the glenohumeral joint

flexion, extension, adduction, abduction, medial rotation, lateral rotation

primary abductors of the glenohumeral joint

supraspinatous and deltoid

what are the primary adductors of the glenohumeral joint

latissimus dorsi and pectoralis major

what are the synergists of the adductors of the glenohumeral joint

teres major, long head of triceps brachii, subscapularism and coracobrachialis

primary lateral rotators of the glenohumeral joint

infraspinatous

synergists of lateral rotators of the glenohumeral joint

teres minor and posterior deltoid

primary medial rotators of the glenohumeral joint

subscapularis

synergistic medial rotators of the glenohumeral joint

anterior deltoid, pectoralis major, latissimus dorsi, teres major