Muscles of the Shoulder & Upper Arm

Question 1

Deltoids (Anterior)

Answer 1

O: Clavicle - lateral 1/3
I: Deltoid Tuberosity
A: Flexion, medial rotation, and horizontal ADduction @ GH joint
*All 3 muscles of Deltoid will ABduct the arm @ the GH joint
N: Axillary Nerve
B: Circumflex Humeral

Question 2

Deltoids (Middle)

Answer 2

O: Acromion
I: Deltoid Tuberosity 
A: ABduction of the arm @ GH joint
N: Axillary Nerve
B: Circumflex Humeral

Question 3

Deltoids (Posterior)

Answer 3

O: Spine of Scapula
I: Deltoid Tuberosity
A: Extension, lateral rotation, and horizontal ABduction @ GH joint
N: Axillary Nerve
B: Circumflex Humeral

Question 4

Rotator Cuffs: Supraspinatus

Answer 4

O: Supraspinous fossa of scapula
I: Greater tubercle 
A: ABduction of arm @ GH joint
N: Supra scapular nerve
B: Supra scapular artery

Question 5

Rotator Cuffs: Infraspinatus

Answer 5

O: Infraspinous fossa
I: Greater tubercle
A: Lateral rotation of arm @ GH joint
N: Supra scapular nerve
B: Circumflex scapular artery

Question 6

Rotator Cuffs: Teres Minor

Answer 6

O: Superior lateral border of scpula
I: Greater tubercle
A: Lateral rotation of arm @ GH joint
N: Axillary nerve
B: Circumflex scapular Artery

Question 7

Most commonly injured Rotator Cuff

Answer 7

Supraspinatus

Question 8

Which muscles insert on greater tubercle

Answer 8

Supraspinatus
Infraspinatus
Teres Minor
*SIT

Question 9

Which 2 muscles are innervated by Axillary Nerve

Answer 9

Deltoids

Teres Minor

Question 10

Name a synergist for Deltoids

Answer 10

Supraspinatus

Question 11

Name an antagonist for Deltoids

Answer 11

Teres Major

Question 12

Which 4 muscles receive blood from Circumflex Scapular Artery

Answer 12

Infraspinatus
Teres Minor
Subscapularis
Teres Major

Question 13

Which Artery do the Deltoids receive blood from

Answer 13

Circumflex Humeral Artery

Question 14

Which Artery does Supraspinatus receive blood from

Answer 14

Suprascapular Artery

Question 15

Which 2 muscles are innervated by Supra Scapular Nerve

Answer 15

Supraspinatus

Infraspinatus

Question 16

Which 2 muscles are innervated by Subscapular Nerve

Answer 16

Subscapularis

Teres Major

Question 17

Subscapularis

Answer 17

O: Subscapular Fossa of Scapula
I: Lesser Tubercle
A: Medial rotation @ GH Joint
N: Subscapular Nerve
B: Circumflex Scapular

Question 18

Teres Major

Answer 18

O: Inferior Angle + Inferior Lateral Border of Scapula
I: Medial Lip of Bicipital Groove
A: Medial Rotation, ADduction, and Extension of arm @ GH Joint
N: Subscapular Nerve
B: Circumflex Scapular

Question 19

Coracobrachialis

Answer 19

O: CoraCoid Process of Scapula
I: Medial Shaft of Humerus
A: Flexion, Horizontal ADduction of arm @ GH Joint
N: Musculocutaneous Nerve
B: Brachial Artery

Question 20

Biceps Brachii

Answer 20

O: Long Head = Supraglenoid Process
     Short Head = CoraCoid Process
I: Radial Tuberosity and Bicipital Aponeurosis
A: Flexion @ GH Joint
    Flexion of forearm @ Elbow Joint
    Supinates forearm @ Radioulnar Joint
N: Musculocutaneous Nerve
B: Brachial Artery

Question 21

Brachialis

Answer 21

O: Distal 1/2 of Anterior Shaft of Humerus
I: Ulnar Tuberosity and CoraNoid Process of Ulna
A: Flexion of Forearm @ Elbow Joint
N: Musculocutaneous Nerve
B: Brachial Artery

Question 22

Triceps Brachii

Answer 22

O: Long Head = Infraglenoid Tubercle
Lateral Head = Proximal 1/2 of Posterior Humeral Shaft
Medial Head = Distal 1/2 of Posterior Humeral Shaft
I: Olecranon Process of Ulna
A: Extends forearm @ Elbow Joint
*Long Head belly Extends arm @ GH Joint
N: Radial Nerve
B: Deep Brachial Artery

Question 23

Difference between Brachial and Deep Brachial Artery

Answer 23

Brachial = Anterior arm

Deep Brachial = Posterior Arm