1What is the origin of the deltoid muscle?
Lateral 1/3 of clavicle, acromion process, and inferior border of spine of scapula
2What is the insertion of the deltoid muscle?
Deltoid tuberosity of humerus
3What are the actions of the anterior fibres of the deltoid?
Flexion and medial/internal rotation of humerus
4What is the action of the middle fibres of the deltoid?
Abduction of humerus
5What are the actions of the posterior fibres of the deltoid?
Extension and lateral/external rotation of humerus
6Which nerve innervates the deltoid muscle?
Axillary nerve
7What is the blood supply of the deltoid muscle?
Anterior and posterior circumflex humeral arteries and thoracoacromial artery (deltoid branch)
8What is the origin of the teres major muscle?
Inferior angle to inferior 1/3 of axillary border of scapula (posterior surface)
9What is the insertion of the teres major muscle?
Medial lip of bicipital groove of humerus
10What are the actions of the teres major muscle?
Adduction, internal rotation, and extension of the humerus
11Which nerve innervates the teres major muscle?
- Lower subscapular nerve
- Upper subscapular nerve
- Axillary nerve
- Suprascapular nerve
12What is the blood supply of the teres major muscle?
Subscapular artery
13What is the origin of the coracobrachialis muscle?
Coracoid process of scapula
14What is the insertion of the coracobrachialis muscle?
Medial aspect, mid-shaft of the humerus
15What are the actions of the coracobrachialis muscle?
Flexion, weak adduction, and horizontal adduction of the humerus
16Which nerve innervates the coracobrachialis muscle?
Musculocutaneous nerve
17What is the blood supply of the coracobrachialis muscle?
Brachial artery and radial recurrent artery
18What is the origin of the supraspinatus muscle?
Supraspinatus fossa of scapula
19What is the insertion of the supraspinatus muscle?
Superior facet of greater tubercle of humerus and superior aspect of GH joint capsule
20What are the actions of the supraspinatus muscle?
Abduction of humerus and dynamic stabilization of GH joint
21Which nerve innervates the supraspinatus muscle?
Suprascapular nerve
22What is the blood supply of the supraspinatus muscle?
Suprascapular artery
23What is the origin of the infraspinatus muscle?
Infraspinatus fossa of scapula
24What is the insertion of the infraspinatus muscle?
Middle facet of greater tubercle of humerus and posterior aspect of GH joint capsule
25What are the actions of the infraspinatus muscle?
External rotation of humerus and dynamic stabilization of GH joint
26Which nerve innervates the infraspinatus muscle?
Suprascapular nerve
27What is the blood supply of the infraspinatus muscle?
Suprascapular artery and circumflex scapular artery
28What is the origin of the teres minor muscle?
Axillary border of scapula (posterior surface, superior 2/3)
29What is the insertion of the teres minor muscle?
Inferior facet of greater tubercle of humerus and posterior aspect of GH joint capsule
30What are the actions of the teres minor muscle?
External rotation of humerus, assists with adduction and extension when flexed, and dynamic stabilization of GH joint
31Which nerve innervates the teres minor muscle?
Axillary nerve
32What is the blood supply of the teres minor muscle?
Circumflex scapular artery and anterior/posterior circumflex humeral arteries
33What is the origin of the subscapularis muscle?
Subscapularis fossa of scapula
34What is the insertion of the subscapularis muscle?
Lesser tubercle of humerus and anterior aspect of GH joint capsule
35What are the actions of the subscapularis muscle?
Internal rotation of humerus and dynamic stabilization of GH joint
36Which nerves innervate the subscapularis muscle?
Upper and lower subscapular nerves
37What is the blood supply of the subscapularis muscle?
Lateral thoracic artery and subscapular artery
38What does the acronym SITS stand for in rotator cuff muscles?
- Supraspinatus, Infraspinatus, Teres Minor, Subscapularis
- Subscapularis, Infraspinatus, Trapezius, Serratus
- Supraspinatus, Interspinalis, Teres Major, Subscapularis
39How many parts is the axillary artery divided into?
40Which artery is given off by the first part of the axillary artery?
Superior thoracic artery
41What are the branches of the second part of the axillary artery?
Thoracoacromial artery/trunk and lateral thoracic artery
42What are the branches of the third part of the axillary artery?
Subscapular, anterior circumflex humeral, and posterior circumflex humeral arteries
43What anatomical landmark marks the name change from the axillary artery to the brachial artery?
Lower margin of teres major muscle