Thumb Flexor Muscles Anatomy Quiz

Which muscle assists in the flexion of the thumb metacarpophalangeal and carpometacarpal joints?

Which nerve supplies the Flexor Pollicis Longus muscle?

What is the range of motion for thumb-metacarpophalangeal joint flexion?

What is the origin of the Superficial Head of Flexor Pollicis Brevis muscle?

What can weakness of the Flexor Pollicis Longus muscle lead to?

What is the main action of the Flexor Pollicis Longus muscle?

Which nerve supplies the Flexor Pollicis Brevis muscle?

What is the primary origin of the Flexor Pollicis Longus muscle?

Which action is NOT primarily associated with the Flexor Pollicis Brevis muscle?

What is the range of motion for interphalangeal joint flexion of the thumb?

Which muscle assists in flexion of the thumb metacarpophalangeal and carpometacarpal joints, as well as in flexion of the wrist?

What is the primary origin of the Deep Head of the Flexor Pollicis Brevis muscle?

Which muscle is responsible for flexing the interphalangeal joint of the thumb and may assist in opposition of the thumb toward the little finger?

What is the range of motion for interphalangeal joint flexion of the thumb?

Which nerve supplies the Flexor Pollicis Longus muscle?

Muscle Functions and Anatomy

The Flexor Pollicis Longus muscle assists in flexion of the thumb metacarpophalangeal and carpometacarpal joints.
The Flexor Pollicis Longus muscle is supplied by the anterior interosseous nerve.
The main action of the Flexor Pollicis Longus muscle is to flex the interphalangeal joint of the thumb.

Muscle Origins

The primary origin of the Flexor Pollicis Longus muscle is the middle half of the anterior surface of the radius and the adjacent interosseous membrane.
The primary origin of the Deep Head of the Flexor Pollicis Brevis muscle is the ulna and the adjacent interosseous membrane.
The origin of the Superficial Head of the Flexor Pollicis Brevis muscle is the flexor retinaculum, the trapezium, and the adjacent part of the first metacarpal bone.

Joint Mobility

The range of motion for thumb-metacarpophalangeal joint flexion is 50-60 degrees.
The range of motion for interphalangeal joint flexion of the thumb is 80-90 degrees.

Muscle Weakness and Actions

Weakness of the Flexor Pollicis Longus muscle can lead to weakness in opposition of the thumb toward the little finger.
The Flexor Pollicis Brevis muscle is responsible for flexing the interphalangeal joint of the thumb and may assist in opposition of the thumb toward the little finger.
The Flexor Pollicis Longus muscle assists in flexion of the wrist.
The action that is NOT primarily associated with the Flexor Pollicis Brevis muscle is extension of the thumb.

Test your knowledge of the origin, insertion, and actions of the flexor pollicis longus and flexor pollicis brevis muscles in the thumb. Identify their nerve supply and functions in hand movement.