Chapter 4 - Shoulder Girdle Flashcards

Shoulder Girdle
Terms Definitions
 
 
2 primary movers of the shoulder that move as a unit
 
Scapula
&
Clavicle
 
 
Manubrium
 
Corocoid Process
 
Acromion Process
 
Glenoid Fossa
 
Borders (Medial & Lateral)
&
Angles (Superior & Inferior)
 
 
Scapula Spine
 
Sternoclavicular jt (SC) movement
mutliaxial jt
arthrodial jt
moves 15 deg anteriorly w/protraction
-15 deg posteriorly w/retraction
-moves 45 deg superiorly w/up. rot.
-moves 5 deg inferiorly w/depression
some rot. of the clavicle during shoulder girdle movements result in slight rotary gliding movements @ SC jt.
supported ant. by anterior SC ligament
-posteriorly by post. ligament
-costoclavicular (ribs to clavicle)
-interclavicular (clavicle to other clavicle)
ligaments provide stability AGAINST SUPERIOR displacement
 
Acromioclavicular (AC) jt.
arthrodial jt. w/20-30 deg of total gliding and rotational movement
supported by coracoclavicular lig.
-superior and inferior acromioclavicular lig
coracoclavicular jt. is a syndesmotic joint w/ligs  that ^ AC jt. stability
 
Scapulothoracic jt.
not a true synovial jt. since its movement is dependent on SC & AC jt.
-no jt. capsule or ligs
helps w/scapular movement (25 deg ab/ad, 60 deg up. rot./down. rot. & 55 deg el/dep)
**supported only by surrounding muscles
between the ant. scapula and posterior rib cage
-articulates between 1st 9 ribs
-not a normal articulation
 
Processes to focus on during movement
Inferior angle (posteriorly)
Glenoid fossa (laterally)
Acromion process (anteriorly)

**all these scapular movements have their pivotal point where the sterum articulates @ the SC jt
 
Scapular/ Shoulder Girdle
Abduction (Ab.)
movement of scapular laterally from vertebrae
protraction
reaching for an object in front of the body
**scapula must rotate or tilt on its axis 
**NOT A PRIMARY MOVER but necessary for normal scapular movement
 
Scapular/Shoulder Girdle 
Adduction (Ad.)
scapula movement towards the vertebrae
retraction
pinching the shoulder blades together
 
**scapula must rotate or tilt on its axis 
**NOT A PRIMARY MOVER but necessary for normal scapular movement
 
 
Scapula/ Shoulder Girdle Movement
Elevation (el.)
 
upward/superior movement
shrugging shoulders
 
**scapula must rotate or tilt on its axis 
**NOT A PRIMARY MOVER but necessary for normal scapular movement
 
 
Scapula/Shoulder Girdle Movement
Depression (dep.)
downward/inferior movement
returning from shoulder shrug
 
**scapula must rotate or tilt on its axis 
**NOT A PRIMARY MOVER but necessary for normal scapular movement
 
 
Scapula/Shoulder Girdle Movement
Upward Rotation (up. rot.)
turning the glenoid fossa superolaterally (upward) 
-moving the inferior angle superolaterally from the vertebrae
 
Scapula/Shoulder Girdle Movement
Downward Rotation (down. rot.)
returning the inf. angle and glenoid fossa inferomedially back to its original position
-further down. rot. results in the sup. angle to become slightly superomedial
 
Scapula/Shoulder Girdle Movements
Lateral Tilt
occurs in the transverse plane w/vert. axis
consequential movement from ab.
scapula rotates to have posterior movement of medial border
-ant. movement of lateral border
*ex-reaching across the body
 
Scapula/Shoulder Girdle Movements
Medial tilt (inward)
occurs in transverse plane w/vert. axis
return from lateral tilt
extreme ad. when scapula rotates w/ ant. movement on medial border
-post. movement on lateral border
 
Scapula/Shoulder Girdle Movement 
Anterior tilt
rotation of sagittal plane w/frontal axis
upward tilt, arm moving into hyperextension w/arm behind back
superior border moves anteroinferiorly
-inferior angle moving posterosuperiorly
 
Scapula/Shoulder Girdle Movement
Posterior Tilt
occurs in sagittal plane w/frontal axis
hyperflexion w/ arm rotated upward near the head
superior border moving posteroinferiorly 
-inferior angle moving anterosuperiorly
 
Purpose of the shoulder girdle muscles
stabilizes the scapula
-allows the humerus to exert more force since the scapula is a more stable base
-movement of shoulder girdle is not dependent on shoulder jt. & muscles
shoulder jt. & girdle work together to carry out upper extremity exercises
 
Components of Cervical Plexus
(C1-C4)
 
roots (rami) - directly from SC
branch
join @ plexus
branch again
 
Components of Brachial Plexus 
(C5-T1)
 
 
roots
trunks (upper, middle & lower) - come together
anterior & posterior divisions
corders
branches - nerves that travel to upper ex.
 
Girdle muscles that Abduct
 
pectoralis minor and serratus anterior
 
Girdle muscles that adduct
 
mid trap and rhomboids
 
Girdle muscles that upward rotate
 
middle trap, lower trap and serratus anterior
 
Girdle muscles that rotate downward
 
pectoralis minor and rhomboid
 
Girdle muscles that elevate
 
levator scapulae, upper trapezius and rhomboid
 
Girdle muscles that depress
 
lower trapezius and petoralis minor
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