Scapular and Deltoid Regions Flashcards
trapezius muscle innervation
CN XI
Spinal accessory nerve
trapezius muscle blood supply
transverse cervical a (branch of thryocervical trunk)
Trapezius muscle action
Retracts the scapula
Superior fibers: rotate glenoid cavity (abduction of arm)
middle fibers: upward rotation and prevent sagging
latissimus dorsi innervation
thoracodorsal nerve (C6-C8)
latissimus dorsi vascularization
thoracodorsal artery (branch of subscapular a. from axillary a)
Latissimus dorsi action
adduction
medial rotation
extension
of arm
levator scapulae innervation
dorsal scapular n
levator scapulae blood supply
transverse cervical a (branch of thyrocervical trunk)
levator scapulae actions
elevates medial angle of scapula
rhomboideus major and minor innervation
dorsal scapular n
rhomboideus major and minor vascularization
transverse cervical a (branch of thyrocervical trunk)
rhomboideus major and minor actions
Elevates medial border and retracts scapula
Serratus anterior innervation
long thoracic n .
serratus anterior blood supply
lateral thoracic a
serratus anterior actions
protracts scapula
holds medial border firmly against thoracic wall
upward rotation (with the trapezius)
Deltoid innervation
axillary n (C5-C6)
deltoid vascularization
deltoid branch of thoracoacromial trunk
deltoid muscle actions
anterior (flex and medially rotate arm)
Middle fibers (abduct arm)
Posterior (extend and laterally rotate arm)
supraspinatus innervation
suprascapular n (C5-C6)
supraspinatus vascularization
suprascapular artery (branch of thyrocervical trunk
supraspinatus actions
abduction of arm
infraspinatus vascularization
suprascapular artery (branch . of thyrocervical trunk) circumflex scapular a
infraspinatus innervation
suprascapular n
infraspinatus actions
lateral rotation of arm
teres major innervation
lower subscapular n
teres major blood supply
thoracodorsal a (a branch of subscapular a)
teres major actions
adduction
medial rotation
extension of arm
teres minor innervation
axillary n
teres minor blood supply
thoracodorsal a
teres minor action
lateral rotation of arm (weak adductor)
subscapularis innervation
upper and lower subscapular n
subscapularis blood supply
thoracodorsal a (a branch of subscapular a)
subscapularis actions
medial rotation of arm
anterior fibers of the deltoid perform what action
flex and medially rotate arm
middle fibers of the deltoid perform what action
abduct arm
posterior fibers of the deltoid perform what action
extend and laterally rotate arm
what are the boundaries of the quandrangular space
superior: lateral border of scapula and capsule of shoulder joint
Lateral: surgical neck of the humerus
Inferior: teres minor
Medial: long head of triceps brachii
what are the contents of the quadrangular space
axillary n
posterior humeral circumflex artery and vein
damage to the spinal accessory nerve would affect what muscle
trapezius affecting scapular rotation, abduction of arm
damage to the thoracodorsal nerve would affect what muscle
latissimus dorsi affecting adduction, medial rotation, extension of arm
damage to the long thoracic nerve would affect what muscle
serratus anterior affecting scapular protraction, upward rotation
damage to the suprascapular nerve would affect what muscle
supraspinatus, infraspinatus, teres major, subscapularis
rotator cuff would be messed up
lateral/medial rotation of the arm would be affected
damage to the axillary n would affect what muscle
teres minor affecting lateral rotation of the arm (and some adduction)
rotator cuff muscles
Supraspinatus
infraspinatus
Teres minor
Subscapularis
the supraspinatus tendon lies between
acromion process
__________
subacromial space 10-12mm
