lecture 9: the shoulder Flashcards
which 2 bones form the glenohumeral joint
scapula and humerus
know all the landmarks of the scapila
.
what are the 2 tubercles of the humerus
lesser and greater
which tubercle facest more laterally
greater tubercke
which neck is more superior: anatomical or surgical
anatomical
what sits between the 2 tubercles
intertubercular groove
what is the orientation of the deltoid tuberocity
lateral
be able to name the landmarks on the hum
,
what type of joint is the glenohum joint
multiaxial ball and socket jt
what are the directins of the multiaxial ball and socket gleno joint
in both direcitons in 3 planes and the combo of these
what makes the gleno jt so mobile
it is a big ball (humeral head) in a small, shallow socket (glenoid fossa)
how much smaller is the glenoid fossa in comparison to the humeral head
3-4 times smaller
what are the motions of the glenohumeral joint
flexion, extension
abduction/adduciton
lateral/medial rotation
explain the cost of a highly mobile shoulder
multiaxial, large ROM with a shallow/ill fititng ball and socket
=instabilitiy
explain the cost of a highly mobile shoulder
multiaxial, large ROM with a shallow/ill fititng ball and socket
=instabilitiys
since there isso much instability of the gleno joint, what is needed
passive and active stab structures
what are the general passive stabilizers of the glenohum jt
glenoid labrum and ligaments
what is the glenoid labrum and its fucntion
the rim of fibrocartilage around the edge of the glenoid fossa that deepens the fossa and increases contact area
true or false: other mammals lack the gelnoid labrum
true
what surface do the glenohumeral ligaments reinforce
reinforce on the anterior/intferior surface
what surface do the coracohumeral ligaments support
the siperior aspect
true or false: the posterior surface of the gleno jt has many ligaments
false, has no ligaments
what are the important ligaments of the gleno jt
coracohum
glenohum
how many glenohumeral ligamnets are there
3