Shoulder Joint Muscles

Question 1

What flexes the shoulder joint

Answer 1

Coracobrachialis, biceps brachii, deltoid anterior, pec major

Question 2

What extends the shoulder joint

Answer 2

Teres major, deltoid (post), triceps brachii, lat dorsi

Question 3

What abducts the shoulder joint

Answer 3

Supraspinatus, deltoid (mid)

Question 4

What adducts the shoulder joint

Answer 4

Teres major and minor, infraspinatus, coracobrachialis, lat Dorsi, pec major

Question 5

What medially rotates the shoulder joint

Answer 5

Teres major, lat dorsi, deltoid (anterior) pec major, subscapularis

Question 6

What laterally rotates the shoulder joint

Answer 6

Teres minor, deltoid posterior, infraspinatus

Question 7

What are the origins, insertions and nerve supply of deltoid (upper,mid and lower fibres)

Answer 7

Origins: 1/3 of clavicle, acromion, spine of scapula
Insertions: mid shaft of humerus
Nerve supply: axillary nerve

Question 8

What are the origins, insertions and nerve supply of coracobrachialis

Answer 8

Origins: tip of coracoid process
Insertions: mid shaft of humerus
Nerve supply: musculocutaneous nerve

Question 9

What are the origins, insertions and nerve supply of teres major

Answer 9

Origins: inferior angle of scapula
Insertions: medial lip of intertubercular groove
Nerve supply: scapula nerve

Question 10

What are the origins, insertions and nerve supply of teres minor

Answer 10

Origins: upper part lateral border of scapula
Insertions: lower most facet on greater tubercle of humerus
Nerve supply: axillary nerve

Question 11

Origins, insertions and nerve supply of supraspinatus

Answer 11

Origins: supraspinous fossa of scapula
Insertions: upper most facet on greater tubercle of humerus
Nerve supply: suprascapula nerve

Question 12

Origins, insertions and nerve supply of infraspinatus

Answer 12

Origins: infraspinous fossa of scapula
Insertions: middle facet on greater tubercle of humerus
Nerve supply: suprascapula nerve

Question 13

Origins, insertions and nerve supply of subscapularis

Answer 13

Origins- subscapula fossa
Insertions- lesser tubercle of humerus
Nerve supply- upper and lower subscapula nerves

Question 14

What are the origins, insertions and nerve supply of pectoralis major

Answer 14

Origins:sternocostal and clavicular attachment
Insertions: lateral lip of intertubercular groove
Nerve supply: median and lower pectoral nerves

Question 14

Origins, insertions and nerve supply of latissimus dorsi

Answer 14

Origins: thoracolumabar fascia spinous processes T6-C12 superior nuchae line and ligamentum nuchae,iliac crest and lower 4 ribs, inferior angle of scapula
Insertions: floor of intertubercular groove
Nerve supply: thoracodorsal nerve

Question 14

Origins, insertions and nerve supply of biceps brachii

Answer 14

Origins: long head from coracoid process, short head from infraglenoid tubercle above humerus
Insertions: tuberosity of radius
Nerve supply: musculocutaneous nerve

Question 14

Origins, insertions and nerve supply of triceps brachii

Answer 14

Origins: long head from- infraglenoid tubercle of humerus 
Medial head- upper shaft of humerus 
Short head- lower shaft of humerus 
Insertions: olecranon of ulna 
Nerve supply: radial nerve

Question 15

Muscles of the rotator cuff and what they do

Answer 15

Infraspinatus, supraspinatus, teres minor, subscapularis, they stabilise the glenohumeral joint