Shoulder And Arm Myology

Question 1

S Pectoralis minor details

Answer 1

O: Anterosuperior surfaces of ribs 3-5
I: Coracoid process of scapula
F: Depress/protract shoulder, downward rotation of scapula, elevate ribs

Question 2

S Pectoralis major details

Answer 2

O: Body of sternum, costlcartilage 2-6, inferomedial portion of clavicle
I: Greater tubercle and lateral edge of intertubercular groove of humerus
F: flexing, adduction, medial rotation

Question 3

S Serratus anterior details

Answer 3

O: Anterosuperior margins of ribs 1-8/9
I: Anterior surface of vertebral border of scapula
F: Protract shoulder, upward rotation of scapula

Question 4

S Trapezuis details

Answer 4

O: Occipital bone, ligamentum nuchae, spinous process of thoracic vertebrae
I: Clavicle, acromion, spine of scapula
F: Elevate, retract, depress or rotate scapula and/or clavicle, extend neck

Question 5

S Levator scapula details

Answer 5

Runs from the vertebral border of the scapula medially to C1-C4 transverse process

Question 6

S Rhomboideus minor

Answer 6

Runs from the vertebral border of the scapula medially to C4-C7 spinous process

Question 7

S Rhomboideus major

Answer 7

Runs to C7-T1 spinous process

Question 8

S Latissimus dorsi

Answer 8

O: Spinous process of inferior thoracic and all lumbar vertebrae, ribs 8-12 and lumbodorsal fascia
I: Floor of intertubercular groove of humerus
F: Extension, addiction, medial rotation at shoulder

Question 9

S Teres major

Answer 9

O: Inferior angle of scapula
I: Medial lip of intertubercular groove of humerus
F: Extension, medial rotation of shoulder

Question 10

S Deltoid

Answer 10

O: Lateral clavicle, acromion and spine of scapula
I: Deltoid tuberosity of humerus
F: Abduction, flexion and medial rotation, extension and lateral rotation

Question 11

S Rotator cuff (4 components)

Answer 11

Subscapularis, supraspinatus, infraspinatus and teres minor

Stabilises and controls movement in the shoulder joint

Question 12

A Biceps brachii

Answer 12

O: Short head = coracoid process, long head = supraglenoid tubercle
I: Radial tuberosity and bicipital aponeurosis
F: Flexion of shoulder and elbow, suppinator

Question 13

A Brachioradialis

Answer 13

O: Lateral supracondylar ridge of distal humerus
I: Base of styloid process or radius
F: Elbow flexion

Question 14

A Coracobrachialis

Answer 14

O: Coracoid process
I: Medial margins of humeral shaft
F: Adduction and flexion of shoulder

Question 15

A Brachialis

Answer 15

O: Anterior distal surface of humerus
I: Coronoid process of ulna
F: Elbow flexion

Question 16

A Triceps brachii

Answer 16

O: Long head = Infraglenoid tubercle of scapula, lateral lead = superior lateral margin of humerus, medial head = posterior surface of humerus inferior to radial groove
I: Olecranon process of ulna
F: Extension of elbow, long head = extension and adduction at shoulder

Question 17

Where do abductors sit

Answer 17

Superiorly to the point of rotation

Question 18

Where to flexors sit

Answer 18

Origins anterior to insertions.