There are many movements @ the shoulder jt.  When humerus moves, the _________ moves too (normally)

scapula

Since the shoulder jt. is so mobile, the surrounding structures are very ____, which can sometimes cause shoulder impingement or tendinitis

lax

An increase in shoulder mobility causes a __________ in shoulder stability

*and vice versa

stability

Where do most shoulder muscles attach?

Either to the scapula

clavicle 

or humerus

scapula: identify

-supraspinatus fossa

-infraspinatus fossa

-subscapularis fossa

-spine of scapula

-glenoid cavity

-coracoid process

-acromion process

-inferior angle

Identify on the humerus:

-head

-greater tubercle

-lesser tuberlce

-intertubercular groove

-distal tuberosity

Describe the shoulder jt.

-glenohumeral jt.

-multiaxial

-ball and socket

-therefore, enarthrodial

-most movable jt. in the body

-similar to the hip jt. but the glenoid fossa is more shallow

Describe what the glenoid labrum does

a cartilaginous ring that surrounds the glenoid fossa just inside its periphery

-like a tea cup holding a saucer

-is NOT good @ what it does