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