Deep Shoulder

Question 1

what do the scapulohumeral muscles attach

Answer 1

the scapula to the humerus

Question 2

what is another name for the scapulohumeral muscles

Answer 2

intrinsic back muscles

Question 3

what do the scapulohumeral muscles do

Answer 3

move the humerus at the shoulder joint and contribute to the stabilization of this joint

Question 4

what are the scapulohumeral muscles innervated by

Answer 4

the brachial plexus

Question 5

what muscles make up the scapulohumeral muscles

Answer 5

deltoid and teres major and rotator cuff muscles

Question 6

what muscles make up the rotator cuff

Answer 6

subscapularis, supraspinatus, infraspinatus, teres minor

Question 7

what is the proximal attachment, distal attachment, actions, and innervation of deltoid

Answer 7

• proximal attachment: lateral 1/3 of clavicle, acromion and spine of scapula
• distal attachment: deltoid tuberosity of humerus
• actions: flexes, medially rotates, abducts, extends, and laterally rotates humerus
• innervation: axillary nerve (C5 and C6)

Question 8

what is the proximal attachment, distal attachment, actions, and innervation of teres major

Answer 8

-proximal attachment: posterior surface of inferior angle of scapula
- distal attachment: medial lip of intertubercular (bicipital) groove of humerus
- actions: adducts and medially rotates humerus
- innervation: lower subscapular nerve

Question 9

what is the proximal attachment, distal attachment, actions, and innervation of supraspinatus

Answer 9

• proximal attachment: supraspinous fossa of scapula
• distal attachment: superior facet of greater tubercle of humerus
• actions: works with deltoid in abduction of humerus, acts with other rotator cuff muscles in stabilizing shoulder joint
• innervation: suprascapular nerve

Question 10

what is the proximal attachment, distal attachment, actions, and innervation of infraspinatus

Answer 10

-proximal attachment: infraspinous fossa of scapula
-distal attachment: middle facet of greater tubercle of humerus
- actions: laterally rotates humerus, helps hold humerus head in place
- innervation: suprascapular nerve

Question 11

what is the proximal attachment, distal attachment, actions, and innervation of teres minor

Answer 11

-proximal attachment: middle part of lateral border of scapula
- distal attachment: inferior facet of greater tubercle of humerus
- actions: laterally rotates humerus, helps hold humeral head in place
- innervation: axillary nerve

Question 12

what is the proximal attachment, distal attachment, actions, and innervation of subscapularis

Answer 12

• proximal attachment: subscapular fossa of scapula
• distal attachment: lesser tubercle of humerus
• actions: medially rotates and adducts humerus helps hold humeral head in place
• innervation: upper and lower subscapular nerves