Card Set Information
6 intrisice shoulder muscles
pectoralis major) how many heads does it have?
pectoralis major) where is the insertion?
intertubucular sulcus of humerus
pectoralis major) what is it innervated by?
lateral and medial pectoral nerves
*arise from brachial plexus
pectoralis major) action? (3)
-and medial rotator of the humeus
-prime mover of arm flexion
pectoralis major) what does it form?
the anterior wall of the axillary fold
pectoralis major) what is the origin? (3)
-ribs 1 thru 6 cartilage
pectoralis major) where does a majoroty of it start from?
latissimus dorsi) description
covers lower half of back and inserts into humerus
latissimus dorsi) where does it insert?
intertubercle groove of the humerus
latissimus dorsi) what innvervates it?
thoracol dorsal nerve
latissimus dorsi) what is the action? (4)
-powerful extensor of humurus
-medial rotator of arm
-helps to depress the shoulder
latissimus dorsi) what does it form?
the posterior axillary fold
latissimus dorsi) what is the origin? (5)
-thoracical lumbar or lumbodorsal fossa
-wide band aponeurosis orginates from spinous process of T7 thru T12
-sometimes inferior angle of scapule
triangle of ausculation) what is on the lateral border of it?
triangle of ausculation) what is on the medial broder of it?
triangle of ausculation) what is on the lower border?
triangle of ausculation) what is the triangle of ausculation used for?
to listen to the lungs
deltoid)what is the origin ? (3)
-lateral 1/3 of clavicle
-lateral aspect of the spine of the scapula
deltoid) where is the insertion?
deltoid) what is it innervated by?
*branch of brachial plexus
deltoid) what is the action?
abducts the arm
*specially above 15 degrees
deltoid) How many parts form the deltoid?
deltoid) what do the anterior part do?
involved in flexion and medial rotation
*help out pectoralis
deltoid) what do the posterior part do?
involved in extension and lateral rotation
*help out lats
deltoid) what do we do to the deltoids?
if a muscle crosses the shoulder joint what part of the body does it move?
the insertion of these 3 muscles was onto what bone? (lats, pecs, deltoids)
the rotator cuff muscles will create an action based on...
the side of the joint they crossed
subscapularis) where is the insertion?
lesser tubercle of the humerus
subscapularis) where iss the origin?
coastal surface of scapula
subscapularis) what is it inervated by?
what do the rotator cuff muscles do?
hold the head of the humerus in the glenoid cvavity
subscapularis) what does it form along with the lats?
subscapularis)what are the actions? (2)
-primary medial rotator of arm
-helps in adduction
fills in subscapular fossa
supraspinatus) where is it located?
supraspinoius fossa of scapula
onto greater tubercle of the humerus
supraspinatus) innervated by?
supraspinatus) what two msucles need to be reflected to see this muscle?
trapezius and deltoid
-initiaion of arm abduction for the first 15 degrees
*after the deltoid become effective
-prevents downward dislocation of the humerus
infraspinatus) what 2 msucles must be reflected to see this?
trapezius and deltoid
infraspinatus) innervated by?
infraspinatus) where does it insert?
greater tubercle of humerus
*just posterior to supraspinatus
infrspinous fossa of the scapula
infraspinatus) action? (2)
-powerful lateral rotator
-helps stabilize the glenoid cavity
teres minor) inserttion?
greater tubercle of the humerus
*inferior to the insertion of infraspinatus
teres minor) origin?
lateral boder of posterior surface of the scapula
teres minor) innervated?
*branch of brachial plexus
teres minor) actions?
works with infraspinatus to laterally rotate arm
*same actions as infraspinatus
teres minor) what sturcture does it work with?
rotator cuff muscles) whats another name for rotator cuff muscles?
*they extend from the scapula to humerus
rotator cuff muscles) which is the only rotator cuff msucle to not rotate the humerus?
rotator cuff muscles) what do the tendons of these 4 msucles do?
they blend with the articular capsule of the shoulder to reinforce it and protect the joint
rotator cuff muscles) which 3 msucles insert on the greater tubercle? (going from anterior to psoterior)
rotator cuff muscles) which is the most anteriorly placed on the greater tubercle?
rotator cuff muscles) which is the most psoteriorly placed on the greater tubercle?
rotator cuff muscles) which sits on the lesser tubercle?
rotator cuff muscles) (quick description of actions) supraspinatus
initiated abduction of humerus
rotator cuff muscles) (quick description of actions) infraspinatus
rotator cuff muscles) (quick description of actions) teres minor
rotator cuff muscles) (quick description of actions) subscapularis
rotator cuff muscles) (quick description of actions) which is the most commonly injured ?
rotator cuff muscles) (quick description of actions) what can happen to shoulder joint if the cuff muscels are injured?
it can become unstable
what does teres mean>?
teres major) what does it help form?
posterior axillary fold
teres major) with what msucle does it work with?
teres major) origin?
off the posterior surface of teh scapula along the inferior angle of scapula
teres major) insertion?
intertubercular sulcus of the humerus
teres major) iinervated?
teres major) actions? (3)
-extends and medially rotates teh arm
*just like lats
teres major) with what sturcture does its tendons usually fuse with?
teres major) what does it do when deltoid pulls?
holds the head of the humerus in place
are teres minor and major the same?
no, differnt nerve supply and different actions
which 3 msucles insert on intertubercular groove of humerus?
which muscle is positioned the most laterally on the intertubercular groove of the humerus?
whcih msucle is positioned the most medially on the intertubercular groove of the humerus?
whcih msucle is positioned in the middle on the intertubercular groove of the humerus?
coracobrachialis) where does it extend from?
coracoid process to the brachium
coracoid process of the scapula
medial surface of humerus just opposite to deltoid tuberosity
coracobrachialis) actions? (2)
-helps to flex
-and adduct the arm
coracobrachialis) with what msucle does it often fuse with?
the short head of biceps brachii