Musculature of the shoulder girdle Flashcards
3 things about the shoulder girdle musculature
have proximal attachment to axial skeleton
distal attachment on scapulae/clavicle
ant/post groupings
Posterior musculature
Trapezius
levator scapulae
Rhomboid major/minor
Function of the trapezius
- elevation 2.elevation,upward rotation, retraction 3.retraction
- upward rotation, depression.retraction
Functions of the levator scapulae
elevation
downward rotation
what force couples with the weight of the arm.
the levator scapulae lifts the medial angle
with the weight of the arm pulling scapulae down
Function of the Rhomboids
downward rotation,
retraction,
elevation
What do rhomboids do
maintain good posture with middle trap
if weak slumped posture
Anterior musculature of shoulder girdle
serratus anterior
pectoralis minor
subclavius
Function of serratus anterior
protraction
upward rotation with trap (force couple)
Pectoralis minor function
downward rotation
anterior tilt
depression
what does pectoralis do
lifting effect on ribs during force inspiration and posture
Functions of subclavius
protect and stabilize the SC joint
depress scapula
Force couples
two forces whose points of application occur on opposite sides of axis
in opposite directions to produce rotation of the body
Example of force coupling
Trapezius & serratus anterior
Deltoid & supraspinatus
What is the force coupling of trapezius & serratus anterior
produces protraction and upward motion of scapula
what is force coupling of the deltoid & supraspinatus
produce abduction of the GH joint
What muscles produce protraction & retraction
serratus anterior
pectoralis minor
trapezius II,III,IV
Rhomboids
What muslces produce upward & downward rotation
Trapezius II,IV serratus anterior levator scapulae rhomboids pectoralis minor
What muscles do elevation & depression
Trapezius I,II--IV levator scapulae rhomboids pectoralis minor subclavius
What exercise strengthens the Rhomboids
Rows
What exercise strengthens the levator scapulae
Shoulder shrugs
