SCAPULOHUMERAL MUSCLES

Question 1

scapulohumeral muscles

Answer 1

1. DELTOID
2. SUPRASPINATUS
3. INFRASPINATUS
4. TERES MINOR
5. SUBSCAPULARIS
6. TERES MAJOR
7. CORACOBRACHIALIS

Question 2

Deltoid

Answer 2

Proximal attachment: A= lateral 1/3 clavicle M= acromion process P= spine of scapula
distal attach: Deltoid tuberosity
innervation: Axillary N C5,6
action: A= F / ABD / horiz F 
M =ABD (F)
P = E / horiz E

Question 3

supraspinatus

Answer 3

Proximal attachment: Supraspinous fossa of scapula
distal attach: Greater tubercle of humerus
innervation: suprascapular N C5,6
action: GHJ ABD. rot &; stabilisation

Question 4

infraspinatus

Answer 4

Proximal attachment: infraspinous fossa of scapula
distal attach: Greater tubercle of humerus
innervation: suprascapular N C5,6
action:GHJ lat. rot &; stabilisation

Question 5

teres minor

Answer 5

Proximal attachment: Lateral dorsal scapula
distal attach: Greater tubercle of humerus
innervation: axillary N C5,6
action: GHJ lat rot. & stabilisation

Question 6

subscapularis

Answer 6

Proximal attachment: Subscapular fossa
distal attach: lesser tubercle of humerus
innervation: upper & lower subscapular N C5,6,7
action: GHJ medial rotation & stabilisation

Question 7

teres major

Answer 7

Proximal attachment: Dorsal inferior angle of scapula
distal attach: Medial lipintertubercular sulcus of humerus
innervation: lower subscapular N C5,6,7
action: GHJ medial rot’n, ADD, E

Question 8

coracobrachialis

Answer 8

Proximal attachment: coracoid process
distal attach: Medial midshaft humerus
innervation: musculocutaneous N C5,6,7
action: GHJ F, add

Question 9

ROTATOR CUFF as synergists (stabilisers) & agonists

Answer 9

SST: medial line of action 
superior
abductor
IST: medial line of action 
inferior
posterior
powerful lateral rotator GHJ
T min: medial line of action inferior
posterior
assists lateral rotation GHJ
SSC: medial line of action i
nferior
anterior
powerful medial rotator GHJ

Question 10

Osteokinematics

Answer 10

gross angular movements of bones (Flexion; abduction etc)

Question 11

Arthrokinematics

Answer 11

movement of joint surfaces in relation to one another
accessory joint movements
Roll, glide & spin

Question 12

Passive & active control of the humeral head

Answer 12

Due to the disparity in sizes of the articular surfaces, the movements of flexion, abduction & rotations cannot result from a pure rolling of joint surfaces.
There must also be glide (translation).
The net translation of the humeral head is usually 1-2mm (<5mm) superiorly

Question 13

translation of HH

Answer 13

The translation of the humeral head during active upper limb movements is less than that during passive movements or testing
MEANING… There is active muscular control of the humeral head!

Question 14

rotator cuff muscles

Answer 14

rotator cuff muscles keep HH on glenoid fossa during

rotation

Question 15

SUBACROMIAL SPACE
CORACOACROMIAL ARCH
contents

Answer 15

1. SST tendon & muscle
2. LBT
3. Superior GHJ capsule / SGHJL / CHL
4. Subacromial bursa

Question 16

Support of the dependent upper limb

Answer 16

Downward pull:
•Gravity
Upward pull:
- Passive tension in:
•Coracohumeral ligament
 •Superior glenohumeral ligament
Active tension in: 
•Deltoid
•Supraspinatus
•Long head biceps brachii 
•Long head triceps brachi