shoulder - all

Question 1

muscles in pectoral girdle

Answer 1

• pectoralis minor
• serratus anterior
• levator scapulae
• rhomboid minor
• rhomboid major
• trapezius

Question 2

pectoralis minor

1) origin
2) insertion
3) action

Answer 2

1) 3-5 ribs
2) coracoid process
3) protracts and rotates scapula downwards

Question 3

serratus anterior

1) origin
2) insertion
3) action

Answer 3

1) ribs 1-8
2) very medial border of scapula
3) lateral rotation, depression, protraction

Question 4

levator scapulae

1) origin
2) insertion
3) action

Answer 4

1) transverse processes of vertebrae C1-C4
2) medial border of scapula
3) medial rotation, elevation

Question 5

rhomboid minor

1) origin
2) insertion
3) action

Answer 5

1) spinous processes of vertebrae C7 though T1
2) top of medial border of scapula
3) medial rotation, elevation, retraction

Question 6

trapezius

1) origin
2) insertion
3) action

Answer 6

1) occipital bone, ligamentum nuchae and spinous processes of C7 to T12
2) continuous insertion along acromion and spine of scapula & lateral third of clavicle
3) lateral rotation, elevation, depression, retraction

Question 7

muscles in rotator cuff

Answer 7

• subscapularis
• supraspinatus
• infraspinatus
• teres minor

Question 8

subscapularis

1) origin
2) insertion
3) action

Answer 8

1) anterior portion of scapula within subscapula fossa
2) lesser tubercle
3) medial rotation, prevents humeral head sliding upwards

Question 9

supraspinatus

1) origin
2) insertion
3) action

Answer 9

1) posterior surface of scapula above scapula spine within supraspinous fossa
2) most superior aspect of greater tubercle
3) abducts humours, prevents downwards dislocation when the arm is relaxed

Question 10

infraspinatus

1) origin
2) insertion
3) action

Answer 10

1) posterior surface of scapula below scapula pine within infraspinalis fossa
2) greater tubercle
3) rotates humorous laterally, prevents humeral head sliding upward when arm is raised

Question 11

teres minor

1) origin
2) insertion
3) action

Answer 11

1) lateral border of scapula
2) greater tubercle
3) laterally rotates arm, prevents humeral head sliding upward when arm is raised

Question 12

deltoid

1) origin anterior, middle & posterior fibres
2) insertion
3) action

Answer 12

1) lateral third of clavicle, acromion and spine of scapula
2) deltoid tuberosity
3) abduction of arm

Question 13

latissimus dorsi

1) origin
2) insertion
3) action

Answer 13

1) sacrum, lumbar spines, up to T6. lower 4 ribs and medial lip of iliac crest
2) floor of intertubercular groove
3) prime mover for arm extension, adduction and medial rotaion

Question 14

teres major

1) origin
2) insertion
3) action

Answer 14

1) posterior surface of scapula at inferior angle
2) medial lip of the intertubercular sulcus of the humerus
3) extends, medially rotates and adducts arm

Question 15

pectoralis major

1) origin
2) insertion
3) action

Answer 15

1) clavicle head : medial half of clavicle. sternal head: lateral border of sternum & superior 6 costal cartilages
2) by a short tendon into the greater tubercle
3) prime mover of arm flexion, medial rotator and adducts arm

Question 16

coracobrachialis

1) origin
2) insertion
3) action

Answer 16

1) coracoid process
2) medial surface of distal humeral
3) flexion and adduction of arms

Question 17

biceps brachii

1) origin
2) insertion
3) action

Answer 17

1) SH - coracoid process LH - supraglenoid tubercle
2) radial tuberosity
3) flexes and supernates forearm

Question 18

triceps brachii

1) origin
2) insertion
3) action

Answer 18

1) LH - infraglenoid tubercle of scapula, lateral head - posterior shaft of humorous, medial head - posterior shaft of humorus distal to radial groove
2) by common tendon into olecranon prosses of ulna
3) forearm extensor

Question 19

what is the rotator cuff

Answer 19

a group of muscles around the glenohumoral joint whose function is to not only produce movement at the glenohumoral joint but to provide the inherent stabilisation of the glenhumoral joint

Question 20

what muscles are SITS

Answer 20

• supraspinatus
• infraspinatus
• teres minor
• subscapularis

Question 21

what scapular muscles with laterally rotate the scapulae to present the glenoid in an upward facing poisiton

Answer 21

• upper trapezius
• lower trapezius
• serratus anterior

Question 22

what muscles produces elevation

Answer 22

• levator scapula

- trapezius

Question 23

what muscle produces depression

Answer 23

lower fibres of trapezius

Question 24

what muscles produce retraction

Answer 24

• rhomboids (major & minor)

- middle fibres of trapezius

Question 25

what muscles produce protraction

Answer 25

• pectoralis minor

- serratus anterior

Question 26

where does the lower fibres of the trapezius attach?

Answer 26

attaches to medial end of spine of scapula

Question 27

rhomboid major

1) origin
2) insertion
3) action

Answer 27

1) spinous processes of T2-T5
2) rest of medial border of scapula
3) retraction

Question 28

where does the middle fibres of the trapezius attach?

Answer 28

crest of spine of scapula

Question 29

muscles in glenohumoral joint for flextion

Answer 29

• pectoralis major
• deltoid - anterior fibres
• biceps brachii
• coracobrachialis

Question 30

muscles in glenohumoral joint for extension

Answer 30

• latissimus dorsi
• pectoralis major
• deltoid - posterior fibres
• triceps - long head

Question 31

muscles in glenohumoral joint for abduction

Answer 31

• deltoid

- supraspinatus

Question 32

muscles in glenohumoral joint for adduction

Answer 32

• coracobrachialis
• latissimus dorsi
• pectoralis major
• teres major

Question 33

medial rotators of the glenohumoral joint

Answer 33

• subscapularis
• teres major
• latissimus
• pectoralis major
• deltoid - anterior fibres

Question 34

lateral rotators of the glenohumoral joint

Answer 34

• teres minor
• infraspinatus
• deltoid - posterior fibres