Origins and insertions

Question 1

Deltoid

Answer 1

ORIGINS:
anterior fibres - anterior border lateral 3rd of clavicle
middle fibres - outer margin of acromion
posterior fibres - lower border spine of scapula

INSERTION:
deltoid tuberosity of humerus

Question 2

Supraspinatus

Answer 2

ORIGIN:
medial two-thirds supraspinous fossa and covering fascia

INSERTION:
greater tubercle of humerus

Question 3

Teres minor

Answer 3

ORIGIN:
upper two thirds lateral border of scapula

INSERTION:
greater tubercle of humerus

Question 4

Infraspinatus

Answer 4

ORIGIN:
Infraspinous fossa of scapula

INSERTION:
greater tubercle of humerus

Question 5

Subscapularis

Answer 5

ORIGIN:
Subscapular fossa of scapula

INSERTION:
lesser tubercle of humerus

Question 6

Pectoralis major

Answer 6

ORIGIN:
medial half anterior border clavicle , anterior surface sternum, anterior surfaces upper 6 costal cartilages and 6th rib

INSERTION:

via laminated tendon into lateral lib intertubercular groove

Question 7

Trapezius

Answer 7

ORIGIN:
superior nuchal line and external occiciptal tuberance, nuchal ligament, spinous processes + supraspinous lig. C7-T12

INSERTION:
post. border lateral third of clav , medial border acromion, upper border spine of scapula

Question 8

Teres major

Answer 8

ORIGIN:
lower third lateral border and inferior angle of scapula

INSERTION:
medial lip of intertubercular groove of humerus

Question 9

Latissimus dorsi

Answer 9

ORIGIN:
t7-12 ,all lumbar and sacral vertebrae, outer lip iliac crest, lower 4 ribs and inferior angle of scap.

INSERTION:
long flat tendon which twists 180 degrees into floor of intertubercular groove

Question 10

Biceps brachii

Answer 10

ORIGIN:
long head - supraglenoid tubercle, runs through shoulder joint and intertubercular groove
short head - apex of coracoid process of scapula

INSERTION:
posterior part of the radial tuberosity

bicipital aponeurosis attaches to deep fascia of forearm

Question 11

Triceps

Answer 11

ORIGIN:
long head - infraglenoid tubercle of scapula

lateral head - posterior surface of humerus (above + lateral to spinal groove)

medial head - posterior surface of humerus (below and medial to spinal groove)

INSERTION:
posterior surface olecranon

Question 11

Anconeus

Answer 11

ORIGIN:
posterior surface lateral epicondyle humerus

INSERTION:
lateral surface of olecranon and posterior surface of ulna