Muscles Of The Shoulder Flashcards Preview

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Flashcards in Muscles Of The Shoulder Deck (12):
1

What is the origin of the deltoid ?

Clavicle
Acromion and spine of scapula

2

What is the insertion of the deltoid ?

Lateral surface of the humerus

3

What are the joint actions of the deltoids ?

Anterior fibres flex the shoulder

All fibres abduct the shoulder

Posterior fibres extend the shoulder

4

What is the origin of the pectoralis major ?

Clavicle, sternum and cartilages of the ribs 1-6

5

What is the insertion of the pectoralis major ?

Top of humerus

6

What are the joint actions of the pectoralis major?

Horizontal flex ion
Adduction
Medial rotation

7

What is the origin of the latissimus Dorsi?

Via thoracolumber fascia from spinous processes T6-T12

Lumbar, sacral vertebrae and iliac crest

Lower ribs 3-4

8

What is the insertion of the latissimus dorsi ?

Top of humerus

9

What are the actions of the latissimus dorsi ?

Adducts and extends the arm

Assists in medial rotation of the arm

Depress the shoulder girdle

10

What is the origin of the teres major ?

Lateral border of the the scapula

11

What is the insertion of the teres major ?

Humerus

12

What are the joint actions of the teres major ?

Medial rotation

Addiction and extension of the shoulder joint