Scapuhumeral Muscles (intrinsic Shoulder)

Question 0

Insertion of deltoid

Answer 0

Deltoid tuberosity of humerus

Question 1

Origin of Deltoid

Answer 1

Lateral third of clavicle, acrominon and spine of scapula

Question 2

Innervation of Deltoid

Answer 2

Axillary Nerve C5, C6

Question 3

Action of Deltoid

Answer 3

Clavicular(anterior) part flexes and medially rotates shoulder joint
Acrominal(middle) part abducts shoulder joint
Spinal(posterior) part extends and laterally rotates shoulder joint

Question 4

Origin of supraspinatus and infraspinatus

Answer 4

supraspinatus fossa and intraspinatus fossa

Question 5

Origin of teres minor

Answer 5

Middle part of lateral border of scapula

Question 6

Insertion of supraspinaatus, infraspinatus, and teres minor

Answer 6

Supraspinatus- Superior facet of greater tubercle of humerus
Infraspinatus- Middle facet of greater tubercle of humerus
Teres Minor- Inferior facet of greater tubercle of humerus

Question 7

Innervation of supraspinatus

Answer 7

suprascapular nerve C4, C5, C6

Question 8

Innervation of Infraspinatus

Answer 8

Suprascapular Nerve C5, C6

Question 9

Innervation of Teres Minor

Answer 9

Axillary nerve C5, C6

Question 10

Action of Supraspinatus

Answer 10

Initiates and assists deltoid in abduction of shoulder joint and acts with other rotator cuff muscles

Question 11

Action of Infraspinatus

Answer 11

Laterally rotate shoulder joint; help hold humeral head in glenoid cavity of scapula.

Question 12

Action of Teres Minor

Answer 12

Laterally rotate shoulder joint; help hold humeral head in glenoid cavity of scapula

Question 13

Origin of Teres Major

Answer 13

Inferior part of lateral border of scapula and posterior surface of inferior angle of scapula

Question 14

Insertion of Teres Major

Answer 14

Medial lip of intertubercular sulcus of humerus

Question 15

Innervation of Teres Major

Answer 15

Lower subscapular nerve C5, C6

Question 16

Action of Teres Major

Answer 16

Adducts and medially rotates shoulder joint

Question 17

Origin of subscapularis

Answer 17

subscapular fossa

Question 18

Insertion of subscapularis

Answer 18

Lesser tubercle of humerus

Question 19

Innervation of subscapularis

Answer 19

Upper and Lower subscapular nerves C5, C6, C7

Question 20

Action of subscapularis

Answer 20

Medially rotates and adducts shoulder joint, helps hold humeral head in glenoid cavity