Shoulder Girdle OIAN

Question 1

Pectoralis minor

Answer 1

O: ribs 3-5
I: coracoid process
A: moves shoulder anteriorly and inferiorly
N: medial (mostly) and lateral pec. nerves

Question 2

Pectoralis major

Answer 2

O: medial 1/3 of clavicle, sternum and first 6 ribs
I: Lateral lip of IT groove
A: Medial rotation, flexion, and adduction (PM)
N: medial and lateral (mostly) pectoral nerves

Question 3

Serratus anterior

Answer 3

O: lateral surfaces of first 9 ribs
I: medial border of scapula and inferior angle
A: stabilization of scapula against thorax; abduction and flexion of GH joint; protraction (PM); upward rotation (PM)
N: long thoracic

Question 4

Subclavius

Answer 4

O: superior surface of clavicle
I: subclavian groove of first rib
A: axial rotation of scapula
N: direct branch from upper trunk

Question 5

Infraspinatus

Answer 5

O: infraspinous fossa
I: greater tubercle
A: lateral rotation (PM)
N: suprascapular

Question 6

Supraspinatus

Answer 6

O: supraspinous fossa
I: greater tubercle of humerus
A: abduction of GH joint (PM for first ~30 degrees)
N: suprascapular

Question 7

Teres major

Answer 7

O: lateral border close to inferior angle
I: medial lip of IT groove
A: medial ration
N: lower subscapular

Question 8

Teres minor

Answer 8

O: lateral border of scapula
I: greater tubercle of humerus
A: lateral rotation
N: axillary nerve

Question 9

Deltoid

Answer 9

O:
anterior fibers - lateral 1/3 of clavicle
middle fibers - acromion
posterior fibers - spine of scapula 
I: deltoid tuberosity 
A: 
anterior - flexion 
middle - abduction (PM between ~30-90 degrees) 
posterior - extension
N: axillary

Question 10

Subscapularis

Answer 10

O: subscapular fossa
I: lesser tubercle
A: medial rotation (PM)
N: upper and lower subscapular

Question 11

Coracobrachialis

Answer 11

O: coracoid process
I: midpoint of shaft of humerus opposite to deltoid tuberosity
A: flexion of GH joint
N: musculocutaneous

Question 12

Biceps brachii

Answer 12

O: 
LH - supraglenoid tubercle 
SH - coracoid process
I: radial tuberosity 
A: abduction of GH joint; SH assists in flexion of GH joint; flexion of elbow; supination (PM)
N: musculocutaneous

Question 13

Brachialis

Answer 13

O: anterior surface of shaft of humerus
I: ulnar tuberosity
A: flexion of elbow (PM)
N: musculocutaneous

Question 14

Triceps brachii

Answer 14

O:
Long head - infralenoid tubercle
Lateral head - posterior surface of humerus, lateral to spiral groove
Medial head - posterior surface of humerus, medial to spiral groove
I: olecranon process
A: 
Long head - extension of GH joint 
All heads - extension of elbow (PM)
N: radial