Hand Muscles

This tutorial covers the intrinsic muscles of the hand, focusing on the thenar, hypothenar, lumbricals, adductor pollicis, and interossei muscles. It explains their actions, innervation, and anatomical significance, including the role of the median and ulnar nerves. The video also highlights the importance of these muscles in hand dexterity and power, and discusses anatomical structures like Guyon's canal and the carpal tunnel.

Which nerve is responsible for the innervation of the thenar muscles?

• Median nerve

• Radial nerve

• Axillary nerve

• Ulnar nerve

What is the primary action of the opponens digiti minimi muscle?

• Flexion of the pinky

• Abduction of the pinky

• Opposition of the pinky

• Extension of the pinky

Through which canal does the ulnar nerve pass to innervate the hypothenar muscles?

• Guyon's canal

• Cubital tunnel

• Radial tunnel

• Carpal tunnel

What unique action do the lumbrical muscles perform?

• Flex the MCP joint and extend the IP joints

• Extend the MCP joint and flex the IP joints

• Abduct the fingers

• Adduct the fingers

Which nerves innervate the lumbrical muscles?

• Only the radial nerve

• Only the ulnar nerve

• Only the median nerve

• Both the median and ulnar nerves

What is the primary function of the adductor pollicis muscle?

• Opposition of the thumb

• Flexion of the thumb

• Adduction of the thumb

• Abduction of the thumb

Which acronym helps remember the actions of the dorsal interossei muscles?

• LAB

• PAD

• DAB

• FAB