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6 intrisice shoulder muscles
-deltoid
-subscapularis
-supraspinatus
-infraspinatus
-teres major
-teres minor
pectoralis major) how many heads does it have?
2
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)
-powerful adductor
-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)
-clavicle
-sternum
-ribs 1 thru 6 cartilage
pectoralis major) where does a majoroty of it start from?
sternum
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
-adductor
-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
-lumbar vertebrea
-illiac crest
-sometimes inferior angle of scapule
triangle of ausculation) what is on the lateral border of it?
scapula
triangle of ausculation) what is on the medial broder of it?
trapezius
triangle of ausculation) what is on the lower border?
latissimus dorsi
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
-acromion process
-lateral aspect of the spine of the scapula
deltoid) where is the insertion?
deltoid touberosity
deltoid) what is it innervated by?
axillary nerve
*branch of brachial plexus
deltoid) what is the action?
abducts the arm
*specially above 15 degrees
deltoid) How many parts form the deltoid?
3 parts
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?
intermuscular injuections
if a muscle crosses the shoulder joint what part of the body does it move?
arm
the insertion of these 3 muscles was onto what bone? (lats, pecs, deltoids)
humeurs
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?
subscapular nerve
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?
posterior fold
subscapularis)what are the actions? (2)
-primary medial rotator of arm
-helps in adduction
subscapularis) Location?
fills in subscapular fossa
supraspinatus) where is it located?
supraspinous fossa
supraspinatus) origin?
supraspinoius fossa of scapula
supraspinatus) inserts?
onto greater tubercle of the humerus
supraspinatus) innervated by?
suprascapular nerve
supraspinatus) what two msucles need to be reflected to see this muscle?
trapezius and deltoid
supraspinatus)action? (2)
-initiaion of arm abduction for the first 15 degrees
*after the deltoid become effective
-prevents downward dislocation of the humerus
infraspinatus) location?
infraspinous fossa
infraspinatus) what 2 msucles must be reflected to see this?
trapezius and deltoid
infraspinatus) innervated by?
suprascapular nerve
infraspinatus) where does it insert?
greater tubercle of humerus
*just posterior to supraspinatus
infraspinatus) origin?
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?
axillary nerve
*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?
infraspinatus
rotator cuff muscles) whats another name for rotator cuff muscles?
scapulohumeral musckles
*they extend from the scapula to humerus
rotator cuff muscles) which is the only rotator cuff msucle to not rotate the humerus?
supraspinatus
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)
-supraspinatus
-infraspinatus
-teres minor
rotator cuff muscles) which is the most anteriorly placed on the greater tubercle?
supraspinatus
rotator cuff muscles) which is the most psoteriorly placed on the greater tubercle?
teres minor
rotator cuff muscles) which sits on the lesser tubercle?
subscapularis
rotator cuff muscles) (quick description of actions) supraspinatus
initiated abduction of humerus
rotator cuff muscles) (quick description of actions) infraspinatus
lateral rotator
rotator cuff muscles) (quick description of actions) teres minor
lateral rotator
rotator cuff muscles) (quick description of actions) subscapularis
medial rotator
rotator cuff muscles) (quick description of actions) which is the most commonly injured ?
supraspinatus
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>?
cylindrical shape
teres major) what does it help form?
posterior axillary fold
teres major) with what msucle does it work with?
latissimus dorsi
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?
subscapular nerve
teres major) actions? (3)
-adducts
-extends and medially rotates teh arm
*just like lats
teres major) with what sturcture does its tendons usually fuse with?
latissiumus dorsi
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?
-pectoralis major
-latissiums dorsi
-teres major
which muscle is positioned the most laterally on the intertubercular groove of the humerus?
pectoralis major
whcih msucle is positioned the most medially on the intertubercular groove of the humerus?
teres major
whcih msucle is positioned in the middle on the intertubercular groove of the humerus?
lats
coracobrachialis) where does it extend from?
coracoid process to the brachium
coracobrachialis) origins?
coracoid process of the scapula
coracobrachialis) inserts?
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
Author
efrain12
ID
238464
Card Set
2.3
Description
shoulder muscles
Updated
10/3/2013, 2:09:16 PM
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