Flashcards in Shoulder and Arms Deck (46):
Joint along the axial skeleton with the least movement
T/F the subacromial and scapulothoracic joints are true joints
The only skeleton that connects the upper limb to the axial skeleton
The sternoclavicular joint is formed by the
sternal end of the clavicle and the manubrium of the sternum
The acromioclavicular joint is formed by the
acromion of the scapula and the acromial end of the clavicle
the coracoclavicular ligament is attached to what part of the clavicle?
this structure deepens the glenoid fossa by 2.5cm
[origin] short head of biceps
coracoid process of the scapula
Which among the gleno-huneral ligament is the strongest?
middle glenohumeral ligament
T/F the deltoid does no work at the first 30 degrees of arm elevation
T; the supraspinatus does the work. the deltoids only work from 30-100 degrees
The scapula is oriented
T/F the acromion is continuous with the spine of the scapula
T/F the deltoid has an attahment to the scapula
T; deltoid tubercle at the spine
Muscle that attaches to the acromion
[origin] subscapular muscle
Which among the borders of the scapula is thinnest/broadest?
what runs in the deltopectoral groove?
[action] descending fibers of the trapezius
Elevate the scapula
[action] middle fibers of the trapezius
[action] ascending fibers of the trapezius
depresses the scapula
[action] levator scapulae
rotates scapula together with rhomboids and pectralis minor
Rhomboids Major and Minor
retract and rotate scapula
[action] serratus anterior
protracts scapula (e.g. when punching) elevates glenoid cavity
abducts arm (30-100 degrees) prevent inferior displacement of humerus
[action] rotator cuff
supraspinatus - abducts scapula
infraspinatus - laterally rotates the scalula
teres minor - laterally rotates the scapula
subscapularis - medially rotates the scapula
[action] latissimus dorsi
adducts and rotates humerus
[action] teres major
adducts and medially rotates humerus
[action] pectoralis major
medially rotates arm
[action] pectoralis minor
stabilizes scapula, elevates ribs
what does the circumflex scapular artery supply?
infraspinatus, supraspinatus, subscapularis
Congenital absence of the clavicle
high scapula or congenital high scapula
common site of fracture in the humerus
what portion of the humerus articulates with the head of the radius?
what part if the humerus articulates with the ulna?
T/F arm flexors are stronger than arm extensors
What muscle is the main flexor of the forearm?
The main extensor of the forearm is the
medial head of the triceps
[type of joint] humeroulnar
[type of joint] humeroradial
[type of joint] radioulnar
the musculocutaneous nerve innervates
biceps, brachialis, coracobrachialis
which carpal bone is most frequently injured?