The Shoulder Joint Extensors

Question 1

Name The Shoulder Joint Extensors

Answer 1

Latissimus Dorsi, Teres Major, Pectoralis Major, Deltoid (Post), Triceps (L/H).

Question 2

Latissimus Dorsi origin

Answer 2

Spinous processes of T7 – L5 vertebrae
Iliac crest of sacrum.
Thoracolumbar fascia.
Inferior angle of the scapula.
Lower three or four ribs.

Question 3

Latissimus Dorsi insertion

Answer 3

Floor of intertubercular (bicipital) groove of humerus.

Question 4

Latissimus Dorsi nerve supply

Answer 4

Thoracodorsal nerve C6, C7, and C8.

Question 5

Latissimus Dorsi actions

Answer 5

shoulder adduction, extension & medial rotation

Question 6

Latissimus Dorsi functions

Answer 6

front crawl pull

Question 7

Teres Major origin

Answer 7

Lower lateral border and inferior angle of the scapula.

Question 8

Teres Major insertion

Answer 8

Medial lip of the intertubercular (bicipital) groove of the anterior humerus.

Question 9

Teres Major nerve supply

Answer 9

Lower subscapular nerve C5, C6, and C7.

Question 10

Teres Major actions

Answer 10

shoulder extension, adduction & medial rotation

Question 11

Teres Major functions

Answer 11

climbing

Question 12

Pectoralis Major origin

Answer 12

Clavicular head: medial half of the clavicle.
Sternal head: sternum, upper costal cartilages (1-6), and the aponeurosis of the external oblique.

Question 13

Pectoralis Major insertion

Answer 13

Lateral lip of the intertubercular (bicipital) groove of the humerus.
Crest of the greater tubercle of the humerus.

Question 14

Pectoralis Major nerve supply

Answer 14

Lateral pectoral nerve to the clavicular head C5, C6, C7
Medial pectoral nerve to the sternal head C8 and T1

Question 15

Pectoralis Major action

Answer 15

Shoulder flexion, adduction and medial rotation.

Question 16

Pectoralis Major function

Answer 16

pushing punching and throwing

Question 17

Deltoid origin

Answer 17

Anterior (clavicular) head: anterior surface of the lateral clavicle.
Middle (acromial) head: acromion process and spine of the scapula.

Question 18

Deltoid insertion

Answer 18

Deltoid tuberosity of the humerus.

Question 19

Deltoid nerve supply

Answer 19

Axillary nerve
C5 and C6

Question 20

Deltoid actions

Answer 20

Posterior fibres: extension & lateral rotation
Anterior fibres: flex & medially rotate

Question 21

Deltoid functions

Answer 21

front crawl pull

Question 22

Triceps origin

Answer 22

Long head: Infraglenoid tubercle of scapula and adjacent glenoid labrum
Lateral head: posterior surface of humorous above and lateral to the spiral groove
Medial head: posterior surface of humorous the low and medial to spiral groove and adjacent sector.

Question 23

Triceps insertion

Answer 23

Posterior surface of the olecranon of the ulna and adjacent deep fascia of the forearm.

Question 24

Triceps nerve supply

Answer 24

Radial nerve C6, 7, 8

Question 25

Triceps actions

Answer 25

Shoulder extension from flexed position

Question 26

Triceps functions

Answer 26

getting out of a pool