Musculus abductor pollicis brevis

The video tutorial explains the abductor pollicis brevis muscle, a key muscle in the thumb. It covers its location, origin from the scaphoideum and trapezium bones, and attachment to the thumb. The muscle is innervated by the median nerve from the brachial plexus. Its primary functions include thumb abduction and flexion at the thumb base joint.

Which side of the hand is the abductor pollicis brevis muscle located?

• Palmar side

• Radial side

• Dorsal side

• Ulnar side

From which bones does the abductor pollicis brevis muscle primarily originate?

• OS scaphoideum and OS trapezium

• OS lunatum and OS pisiform

• OS capitatum and OS hamatum

• OS trapezoid and OS capitatum

What is the connection of the abductor pollicis brevis muscle to the transverse retinaculum flexorum?

• It is partially connected

• It is not connected

• It is directly connected

• It is indirectly connected

Which nerve supplies the abductor pollicis brevis muscle?

• Median nerve

• Musculocutaneous nerve

• Radial nerve

• Ulnar nerve

What is the primary function of the abductor pollicis brevis muscle?

• Flexion of the thumb

• Extension of the thumb

• Abduction of the thumb

• Adduction of the thumb