Upper MSK Anatomy Flashcards
How is glenohumeral joint formed?
articulation between glenoid fossa of scapula + humerus
What are the 2 main articulations of the scapula?
glenohumeral joint
acromioclavicular joint
What are the 4 rotator cuff muscles?
subscapularis
supraspinatus
infraspinatus
teres minor
Where does the subscapularis muscle insert from and end?
originates: subscapular fossa
insertion: lesser humeral tuberosity
Where does the supraspinatus muscle insert from and end?
originates: supraspinous fossa of the scapula
insertion: greater tubercle of the humerus
Where does the infraspinatus muscle insert from and end?
originates: infraspinous fossa of the scapula
insertion: greater tubercle of the humerus
Where does teres minor muscle insert from and end?
originates: posterior surface of the scapula, adjacent to its lateral border. It attaches to the greater tubercle of the humerus.
Which rotator cuff muscles laterally rotate the arm?
Teres minor
Infraspinatus
Which rotator cuff muscle medially rotates the arm?
Subscapularis
Which rotator cuff muscle abducts the upper limb at the shoulder?
Supraspinatus
What rotator cuff muscles are innervated by the suprascapular nerve?
Supraspinatus
Infraspinatus
What rotator cuff muscle is innervated by the subscapular nerves?
Subscapularis
What rotator cuff muscle is innervated by the axillary nerve?
Teres minor
What are the 3 deep extrinsic shoulder muscles?
Levator scapulae
Rhomboid major and minor
What are the 2 superficial extrinsic shoulder muscles?
Trapezius
Latissimus dorsi
What innervates the trapezius and where does it arise from?
C7-T12
originate: skull
insert: clavicle, acromion, scapular spine
innervation: accessory nerve
What innervates the latissimus dorsi?
thoracodorsal nerve
What innervates levator scapulae?
dorsal scapular nerve
What innervates rhomboids?
dorsal scapular nerve
What specific action is performed by the middle fibers of the trapezius muscle at the shoulder girdle?
Scapula retraction
upper fibres - elevate the scapula and rotates it during abduction of the arm
middle fibres - retract the scapula
lower fibres - pull the scapula inferiorly.
A amateur shotput thrower is seen in ED with shoulder pain and weakness. Torn anterior deltoid fibres are seen on ultrasound imaging.
What movement would be most affected?
What are the 6 intrinsic shoulder muscles?
deltoid
Teres major
4 rotator cuff muscles - supraspinatus, infraspinatus, teres minor, subscapularis
Whata re the 3 muscles of anterior compartment>
Biceps brachii
Brachialis
Coracobrachialis