Unit 3 Arm

Question 1

Humerus Head Articulation

Answer 1

• Glenohumeral joint

Question 2

Humerus Necks

Answer 2

• Anatomical
• Surgical

Question 3

Anatomical Neck

Answer 3

• Epiphyseal plate of long bone

Question 4

Common Break Site

Answer 4

• Surgical neck

Question 5

Humerus Shaft Components

Answer 5

• Greater & lesser tubercle
• Intertubercular sulcus

Question 6

Elbow Articulation

Answer 6

• Capitulum
• Trochlea

Question 7

Flexor/Anterior Compartment

Answer 7

• Innervated by musculocutaneous

Question 8

Extensor/Posterior Compartment

Answer 8

• Innervated by radial

Question 9

Arm Flexor Muscles

Answer 9

• Biceps brachii
• Coracobrachialis
• Brachialis

Question 10

Flexor Muscle Innervation

Answer 10

• Shoulder
• Elbow

Question 11

Biceps Brachii Attachment

Answer 11

• Distal to elbow
• Tendon attaches to radius
• Aponeurosis attaches to ulnar

Question 12

Biceps Brachii Function

Answer 12

• Pronation

Question 13

Aponeurosis Function

Answer 13

• Weak flexion of forearm
• Flexion of elbow
• Protect cubital fossa

Question 14

Coracobrachialis

Answer 14

• Shoulder flexor

Question 15

Brachialis

Answer 15

• Elbow flexor

Question 16

Musculocutaneous Innervation

Answer 16

• Biceps
• Coracobrachialis
• Brachialis

Question 17

Radial Innervation

Answer 17

• Brachialis

Question 18

Rupture of Bicep (Long Head)

Answer 18

• Tendon torn/avulsed
• Pulled off supraglenoid tubule (glenohumeral joint)
• Not surgical
• Muscle will atrophy

Question 19

Musculocutaneous Nerve Pathway

Answer 19

• Anterior to humerus
• Pierces coracobrachialis

Question 20

Musculocutaneous Injury Function Implications

Answer 20

• Loss of shoulder flexion
• Loss of forearm supination
• Loss of elbow flexion

Question 21

Extensor/Posterior Muscles

Answer 21

• Triceps (long, medial, lateral heads)

Question 22

Long Head of Triceps Function

Answer 22

• Arm extension
• Crosses shoulder joint

Question 23

All Tricep Heads Function

Answer 23

• Forearm Extension

Question 24

Radial Nerve Innervation

Answer 24

• All tricep heads

Question 25

Humeral Shaft Fracture Young People

Answer 25

• High energy trauma

Question 26

Humeral Shaft Fracture Old People

Answer 26

• Osteopenia

Question 27

Humeral Shaft Fracture Risks

Answer 27

• Radial nerve at radial groove
• Radial nerve palsy
• Reduced risk extension
• Radial deviation
• Reduced elbow flexion

Question 28

Radial Nerve Pathway

Answer 28

• Posterior to humerus
• Under lateral head of triceps
• Along radial groove

Question 29

Axilla Boarders

Answer 29

• Anteriorly pectoralis major & minor
• Medially, serratus anterior & thoracic
• Posteriorly, subscapularis, teres minor & latissimus dorsi
• Laterally, intertubercular sulcus