Anatomy of the Thumb and Hand

The video tutorial covers the anatomy of the thumb, focusing on its muscles. It begins with an orientation of the hand, identifying the radial and ulnar sides, and the anterior and posterior faces. The tutorial then discusses the eight muscles of the thumb, starting with the anterior muscles, including adductor pollicis, opponens pollicis, flexor pollicis longus, flexor pollicis brevis, and abductor pollicis brevis. It highlights their functions and innervation. The posterior muscles, such as abductor pollicis longus, extensor pollicis brevis, and extensor pollicis longus, are also covered, along with their innervation by the radial nerve. The video concludes with an explanation of the anatomical snuffbox, its borders, and the structures within it.

Which side of the hand is referred to as the radial side?

• Medial side

• Lateral side

• Distal side

• Proximal side

How many muscles are involved in the movement of the thumb?

• Six

• Five

• Eight

• Seven

Which muscle is responsible for the opposition of the thumb?

• Abductor pollicis brevis

• Flexor pollicis longus

• Opponens pollicis

• Adductor pollicis

Which nerve innervates the abductor pollicis muscle?

• Radial nerve

• Median nerve

• Musculocutaneous nerve

• Ulnar nerve

What is the function of the flexor pollicis longus muscle?

• Flexion of the thumb

• Opposition of the thumb

• Abduction of the thumb

• Extension of the thumb

Which muscle's tendon is found in the posterior forearm and allows for thumb abduction?

• Extensor pollicis brevis

• Flexor pollicis brevis

• Abductor pollicis longus

• Opponens pollicis

Which nerve is responsible for innervating the posterior muscles of the thumb?

• Axillary nerve

• Radial nerve

• Ulnar nerve

• Median nerve

What forms the borders of the anatomical snuffbox?

• Abductor pollicis longus and brevis

• Opponens pollicis and adductor pollicis

• Flexor pollicis longus and brevis

• Extensor pollicis brevis and longus

Which artery is located within the anatomical snuffbox?

• Brachial artery

• Radial artery

• Axillary artery

• Ulnar artery

What bone is found in the anatomical snuffbox and can cause pain if fractured?

• Lunate

• Trapezium

• Capitate

• Scaphoid