Muscles
Small muscle squeezed between teres major and infraspinatus
teres minor
_________________ and ________________ are antagonists on elevation of the scapula and are the two prime movers of elevation/depression
trap upper fibers, trap lower fibers
trapezius bilaterally creates what movement?
extension of the head and neck
What bones create the shoulder girdle?
clavicle, humerus, scapula
present in only 5% of the population, it is thin and superficial
sternalis
located along the lateral and posterior sides of the neck, inferiorly deep to the trapezius yet superiorly superficial
levator scapula
_________________ and ________________are syngergists in abduction of the shoulder
deltoid, all fibers
supraspinatus
trapezius unilaterally creates what movement?
laterally flexes the head and neck - same side
rotates head and neck - opposite side
elevates the scapula
upwardly rotates the scapula
articulates with the glenoid fossa
humerus
between the spine and the scapula, you have 3 muscles at 3 different layers all fibers running in different directions that you are able to palpate. name those muscles from deep to superficial
erector spinae, rhomboids, trapezius
majority of this muscle is deep to the scapula, latissimus dorsi, and pectoralis major
serratus anterior
______________ and _____________ are antagonists during flexion of the shoulder, however they are both the least responsible for creating flexion/extension
coracobrachialis, triceps brachii long head
What two actions does subscapularis create
medial rotation
stabilizes the shoulder joint
_______________ is the lateral aspect of the spine of the scapula and is located at the top of the shoulder. it articulates with the clavicles lateral end
this muscle can single handedly bring the arm to a 90 degree angle
supraspinatus
the rotator cuff muscles
supraspinatus, infraspinatus, teres minor, subscapularis
_______________, ________________, and _______________ are all three synergists during lateral rotation
deltoid posterior fibers, infraspinatus, teres minor
scratching your own mid-back would primarily use what muscle?
subscapularis
_____________ is a projection found inferior to the shaft of the clavicle, often found in the deltopectoral groove
coracoid process
anteriolateral view of the rotator cuff tendons attachment sites on the humerus from left to right
teres minor, infraspinatus, supraspinatus, subscabularis
a small difficult to palpate muscle, is a secondary muscle for humans but an important primary muscle for quadripeds
subclavius
During downward rotation of the scapula, ______________ is the prime mover and _________________ is the least responsible for the movement but they are synergistic together
shrugging your shoulders when jen asks you a question would primarily use what two muscles?
rhomboid major and minor
the ______________ is located at the top of the scapula, runs at an oblique angle to the body, spans from the acromion to the medial border, and serves as an attachment site for the posterior deltoid and middle + lower trapezius
spine of the scapula
the structures a tight pectoralis minor can impinge
brachial plexus, axillary artery, axillary vein