Chapter 5 Flashcards
How is the shoulder joint attached?
Via the clavicle at SC joint
Glenohumeral joint
multiaxial ball and socket
Enarthrodial
Range of motion of glenohumeral
90 degrees abduction 0-75 adduction 40-60 extension 90-100 flexion 70-90 rotation
Why is the glenohumeral joint frequently injured?
shallowness of glenoid fossa lack of strength of muscles instabilty issues labrum short small muscles
What are the muscles that make up rotator cuff? (SITS)
Subscapularis, supraspinatus, infraspinatus and teres minor
Why is rotator cuff frequently injured?
attaches to top, front, rear of head.
Not much room for all muscles
Some hook on edge of acromion, can cause tears
Anterior muscles of shoulder:
Pect major
Coracobrachialis
Subscapularis
Superior muscles of shoulder:
Deltoid and supraspinatus
posterior muscles of shoulder:
latissuimus dorsi
Teres major
Infraspinatus
Teres minor
All shoulder joints are innervated from?
Brachial plexus
Pectoral Major- origin, insertion, nerve and action
0: medial 1/2 clavicle, costal cartilage first 6 ribs
I: lateral lip of interrtubercular groove
N: medial and lateral pectoral n.
A: internal rotation, adduction and horizontal adduction
Latissium Dorsi- origin, insertion, nerve and action
O: posterior ilium, spinous process of sacrum to T6.
I: floor of intertubercular groove
N: theracodorsal nerve
A: adduction, internal rotation, extension
Teres major
O: inferior angle of scapula,
I: medial lip of intertubercular groove
N: lower subscapular nerve
A: adduction, internal rotation, extension
Deltoid
O: lateral 1/3 of clavicle, acromion, spine of scapula
I: deltoid tuberosity
N: axillary nerve
A: anterior-flexion, middle- abduction, posterior-extension
Coracobrachialis
O: coracoid process
I: middle 1/3 or humerus
N: musculocutaneous
A: flexion
What is a synergist of Coracobrachialis?
Anterior deltoid
Which two muscles externally rotate glenohumeral joint?
Infraspinatus and teres minor.
Subscapularis
O: subscapular fossa
I: lesser tubercle
N: upper and lower subscapular nerve
A: internal rotation
Supraspinatus
O: supraspinatus fossa
I: greater tubercle
N: suprascapular nerve
A: abduct for 30 degrees (deltoid
Infraspinatus
O:infraspinatus fossa
I: greater tubercle
N: suprascapular nerve
A: lateral external rotation
Teres minor
O: lateral border or scapula
I: greater tubercle
N: axillary
A: lateral extension rotation
3 muscles that insert into greater tubercle:
teres minor, infraspinatus and supraspinatus
Synergists to Coracobrachialis in flexion is:
anterior deltoid, and
In the action of abduction the synergist to middle deltoid is:
superspinatus
