Pectoral Girdle Skeletal/muscular Flashcards
“Good posture”
Retracted scapulae
“Poor posture”
Protracted scapulae
Elevators (4)
-rhomboid major and minor
-levator scapulae
-trapezius (superior)
Depressors (2)
Trapezius (inferior)
Pectoralis minor
Superior rotators (2)
-serratus anterior
-trapezius (superior)
Inferior rotators (3)
-Rhomboid major and minor
-levator scapulae
Anterior thoracic muscles
-pectoralis minor
-serratus anterior
-subclavis
Pectoralis minor
-thin, flat and triangular
Helps depress and protract the scapula
Shoulders are hunched forward what is contracting?
Pectoralis minor
Serratus anterior
Large, flat, fan shaped
-between rib and scapula
-Agonist in scapula protraction
-holds scapula against the rib cage
Subclavius
Small, cylindral
-stabilize and depress clavicle
Posterior thoracic muscles
-trapezius
-levator scapulae
-rhomboid minor and major
Trapezius
Large flat, diamond shape
-elevate, depress, retract or rotate scapula
Levator scapulae
Narrow, elongated muscle
-elevates the scapula
Rhomboid minor and major
-elevate and retract the scapula
Stand up straight with your shoulders back
Trapezius superior fibres
Elevate and superiority rotate scapula
Trapezius middle fibres
retract scapula
Inferior fibres
Depress scapula
Latissimus dorsi and pectoralis major are primary attachments of…
The arm to the trunk
Latissimus dorsi
“Swimmers muscle”
-agonist of arm extension
-abducts and medially rotates arm
Pectoralis major
Agonist of arm flexion
-abducts and medially rotates arm
Deltoid
Three different proximal attachment points, but is overall an extremely powerful muscle
-prime abductor of the arm
Deltoid anterior fibres
Flex and medially rotate the arm
Deltoid middle fibres
Abduct the arm
Deltoid posterior fibres
Extend and laterally rotate the arm
Croacobrachialis
Synergistic to pectoralis major
-flexing and adducting the arm
Teres major
Synergistically with the latissimus dorsi
-extending, adducting and medially rotating the arm
Rotator cuff muscles
-subscapularis
-supraspinatus
-infraspinatus
-teres minor
Subscapularis
Winding up for a pitch
-medially rotates the arm
Supraspinatus
Start the execute the pitch
-abduct the arm
Infraspinatus and teres minor
Slow down the pitching arm after completion
-adducting and laterally rotate arm
Girdles
Connect limbs to axial skeleton
Clavicle
S shaped bone that connects the pectoral girdle - and the axial skeleton
Sternal end of clavicle
Manubrium/sternoclavicular joint
Acromial end of the clavicle
Forms acromoclavicular joint
Scapula is a – bone
Flat
Two ends of the clavicle
-sternal end
-aoromial end
Sternal end
Forms sternoclavicular join
Aoromial end
Forms acromioclavicular joint
Three borders of the scapula
-superior
-medial
-lateral
Three scapula angle
-superior angle
-lateral angle
-inferior angle
The scapula fossa function
For muscle attachment
Shoulder joint is a…
Ball-socket
Anterior thoracic
-pectoralis minor
-serratus anterior
-subclavis
Posterior thoracic
Levator scapulae, rhomboid major/minor, trapezius
Subclavis origin and intercept
O: rib
I: inferior surface clavicle
Pectoralis minor origin and intercept
O: rib 3-5
I: coracoid
Serratus anterior origin and intercept
O: 1-8, rib
I: medial boarder scapula (Facing vertebral)
Anterior thoracic origin is usually
Rib
Posture thoracic origin usually is
Back of skull/vertebral
Trapezius origin and intersect
O: occipital bone
I: clavicle
Levator scapulae origin and intersect
O: C1-C4
I: superior part of medial scapula
Rhomboid minor origin and intersect
O: cerveical vertebra
I: medial border scapula
Rhomboid major origin and intersect
O: thoracic vertebra
I: medial border scapulae
