Posterior Shoulder Flashcards
What are the bones in the pectoral girdle?
Clavicle
Manubrium of sternum
Scapula
What joint in the posterior shoulder is commonly dislocated?
Acromioclavicular joint
Via which three bilateral joints does the upper limp articulate to the appendicular skeleton?
Glenohumeral
Acromioclavicular
Sternoclavicular
What 4 things is the glenohumeral joint susceptible to?
OA
RA
Dislocation
Adhesive capsulitis
What is the glenoid labrum?
A ring of fibrocartilage around the glenoid cavity
What is the function of the glenoid labrum?
It increases the size of the humeral head to increase stability of the glenohumeral joint
What can cause a labral tear?
Trauma
Repetitive overuse e.g. swimming
What is a SLAP tear?
Superior labral tear from anterior to posterior
What are the extrinsic shoulder muscles? (5)
Trapezius
Latissimus dorsi
Levator scapulae
Rhomboid - major and minor
What is the origin and insertion of trapezius?
Origin: Skull and spinous processes of C7- T12
Insertion: Occiput and spine of scapula
What is the innervation of trapezius?
Accessory Nerve CNXI
What is the action of trapezius?
Depress
Retract
Elevate
scapula
What is the origin and insertion of latissimus dorsi?
Broad origin: T6- T12, illiac crest, inferior 3 ribs
Instertion: Humerus
What is the innervation of latissimus dorsi?
Thoracodorsal nerve - C6, C7, C8
What is the action of latissimus dorsi?
Extends, adducts and medially rotates the upper limb
What is the origin and insertion of levator scapulae?
Origin: C1- C4
Insertion: scapula
What is the innervation of levator scapulae?
Dorsal scapular nerve C5
What is the action of levator scapulae?
Elevates scapula
Which of the rhomboids sits more superiorly?
Rhomboid minor
What is the origin and insertion of rhomboid minor?
Origin: C7 - T1
Insertion: Scapula
What is the origin and insertion of rhomboid major?
Origin: T2 - T5
Insertion: Scapula
What is the innervation of rhomboid major?
Dorsal scapular nerve C5
What is the action of the rhomboid major?
Retracts and rotates scapula
What is the innervation of rhomboid minor?
Dorsal scapular nerve C5
What is the action of the rhomboid minor?
Retracts and rotates scapula