Intermediate Flexor Digitorum Superficialis Quiz

Q1. Which two heads contribute to the proximal origin of flexor digitorum superficialis?

• Superficial and deep humeral heads
• Medial and lateral scapular heads
• Radial and ulnar styloid heads
• Humeroulnar and radial heads

Q2. Which structures contribute to the origin of the humeroulnar head of flexor digitorum superficialis?

• Medial epicondyle, ulnar collateral ligament, and coronoid process
• Radial tuberosity, interosseous membrane, and lateral epicondyle
• Lateral epicondyle, annular ligament, and olecranon
• Olecranon, posterior ulna, and radial styloid

Q3. From which bone does the radial head of flexor digitorum superficialis arise?

• Ulna
• Radius
• Scapula
• Clavicle

Q4. Which nerve passes deep to the fibrous arch between the humeroulnar and radial heads of flexor digitorum superficialis?

• Posterior interosseous nerve
• Ulnar nerve
• Radial nerve
• Median nerve

Q5. Which artery also passes deep to the fibrous arch of flexor digitorum superficialis?

• Deep brachial artery
• Posterior circumflex humeral artery
• Radial artery
• Ulnar artery

Q6. What happens to each flexor digitorum superficialis tendon within the finger?

• It joins the extensor expansion without dividing
• It terminates at the metacarpophalangeal joint
• It divides into two slips around the profundus tendon
• It remains a single tendon to the distal phalanx

Q7. What is the split in the flexor digitorum superficialis tendon that allows passage of the profundus tendon commonly called?

• Arcade of Frohse
• Camper's chiasm
• Lisfranc ligament
• Guyon's canal

Q8. Which spinal nerve roots commonly contribute to the innervation of flexor digitorum superficialis?

• T2 and T3 only
• C5 and C6 only
• C3 and C4
• C7, C8, and T1

Q9. Which structure surrounds the flexor digitorum superficialis and profundus tendons within a finger?

• Extensor retinaculum
• Palmar aponeurosis only
• Fibrous digital sheath
• Dorsal digital expansion

Q10. How is flexor digitorum superficialis function commonly tested in an individual finger?

• Ask the patient to abduct the tested finger against resistance
• Ask the patient to extend all fingers against resistance
• Hold the other fingers extended and ask the tested finger to flex at the proximal interphalangeal joint
• Hold the proximal interphalangeal joint extended and ask for distal interphalangeal flexion