shoulder muscles

Question 1

the glenohumeral is what kind of joint

Answer 1

ball and socket joint

Question 2

where does it articulate

Answer 2

head of the humerus with the glenoid cavity of the scapula

Question 3

6 movements of the shoulder joint

Answer 3

1) flexion
2) extension
3) abduction
4) adduction
5) medial rotation
6) laterial rotation

Question 4

what are the 4 muscles of the rotater cuff

SITS

Answer 4

1) supraspinatus
2) infraspinatus
3) teres minor
4) subscapularis

Question 5

supraspinatus :
origin
instertion 
function 
structure/ relationship

Answer 5

ORIGIN : supraspinous fossa
INSERTION : upper aspect of greater tubercle
FUNCTION : stabilize shoulder
1st 5-10 degrees of abduction
keeps humerus head in gleniond cavity
S/R : very tendionus
convergent fibers (origin is larger than insertion)
passes underneath acromion process
deep to trapezius and deltoid

Question 6

infraspinatus :
origin
insertion 
function 
strcture and relationship

Answer 6

ORIGIN : infraspinous fossa
INSERTION : middle aspect of greater tubercle
FUNCTION : stabilize shoulder
keeps humerus head in glenoid cavity
laterial rotation
S/R : tendionous muscle
convergent fibers (origin lager than insertion )

Question 7

teres minor 
origin
insertion 
function 
structure and relationship

Answer 7

ORIGIN : dorsal surface of lateral edge of scapula
INSERTION : lower aspect of greater tubericle
FUNCTION : stabilize shoulder
lateral rotation
keeps humerus head in glenoid cavity
S/R : small muscle
easily palpated
mostly covered by the deltiod

Question 8

subscapularis 
origin 
insertion
function
structure and relationship

Answer 8

ORIGIN : subscapular fossa
INSERTION : lesser tubercle
FUNCTION : stabilize shoulder 
                   medial rotation 
S/R : only rotar cuff muscle that attaches at the lesser tubercle

Question 9

3 of the 4 rotator cuff muscles attach to the

Answer 9

greater tubercle

Question 10

shoulder cap muscle is

Answer 10

deltiod

Question 11

deltiod 
origin 
insertion
function
structure and relationship

Answer 11

ORIGIN : laterial 1/3 of clavicle
acromion
spine of scapula
INSERTION : deltiod tuberosity
FUNCTION : abduction, flexion, extension, medial and laterial rotation
S/R : insertion of trapezius is origin of deltoid
convergent fibers
powerful muscle of the shoulder
is able to do opposing actions
superficial muscle

Question 12

name the 3 intertubercular groove muscle

Answer 12

1) pectoralis major
2) teres major
3) latissmus dorsi

Question 13

pectoralis major
origin 
insertion 
function 
structure and relationship

Answer 13

ORIGIN : anterior part of the sternum
anterior medial clavical
anterior surface of costal cartilage ribs 1-7
INSERTION : laterial edge of intertubercle groove
FUNCTION : adduction
medial rotation
flexion of extended shoulder
S/R : superficial to pec minor and subclavicle
anterior wall of axillary space

Question 14

teres major 
origin 
insertion 
function
structure and relationship

Answer 14

ORIGIN : dorsal surface of inferior angle
INSERTION : medial ridge of intertubercle groove
FUNCTION : adduction
medial rotation
extension of flexed shoulder
S/R : round muscle interior to teres minor
passes anteriorly between humerus and ribs
forms posterior wall of axillary wall

Question 15

latissimus dorsi
origin
insertion function
structure and relationship

Answer 15

ORIGIN : T7 - T12
spinous process of lumbar and scaral vert.
thoracolumbar fossa
medial posterior side of iliac crest
INSERTION : floor of intertubercle groove
FUNCTION : adduction
medial rotation
extention of flexes shoulder
S/R : broad muscle of the back
passes anterioly between humerus and ribs
convergent fibers