Thenar muscles

This video tutorial covers the anatomy of the thenar muscles, located on the radial palmar side of the hand. It details the origin, insertion, and innervation of four key muscles: the abductor pollicis brevis, adductor pollicis, flexor pollicis brevis, and opponens pollicis. Each muscle's unique characteristics, such as origin points and nerve supply, are explained. The tutorial concludes with suggestions for further learning through Kenhub's resources.

Where are the thinner muscles located in the hand?

• On the ulnar side

• On the lateral side

• On the radial palmar side

• On the dorsal side

Which carpal bone is NOT an origin point for the abductor pollicis brevis?

• Trapezium

• Scaphoid

• Flexor retinaculum

• Capitate

What nerve innervates the abductor pollicis brevis?

• Ulnar nerve

• Radial nerve

• Musculocutaneous nerve

• Median nerve

How many heads does the adductor pollicis muscle have?

• Four

• Three

• Two

• One

Which nerve is responsible for the innervation of the adductor pollicis?

• Superficial branch of the ulnar nerve

• Deep branch of the ulnar nerve

• Radial nerve

• Median nerve

What is the origin point of the superficial head of the flexor pollicis brevis?

• Trapezoid

• Capitate

• Flexor retinaculum

• Trapezium

Which nerve innervates the deep head of the flexor pollicis brevis?

• Radial nerve

• Superficial branch of the ulnar nerve

• Deep branch of the ulnar nerve

• Recurrent branch of the median nerve

What is the primary insertion point of the opponens pollicis muscle?

• Base of the first proximal phalanx

• Radial sesamoid bone

• Ulnar sesamoid bone

• Radial side of the first metacarpal

Which carpal bone serves as an origin for the opponens pollicis?

• Trapezoid

• Capitate

• Trapezium

• Scaphoid

Which nerve provides innervation to the opponens pollicis?

• Musculocutaneous nerve

• Ulnar nerve

• Radial nerve

• Median nerve