Muscles Of The Hand ~ Aoi

1. What is the origin, insertion, and action of the Abductor digiti minimi muscle?

Extensor indicisA: Extend index fingerO: Posterior ulnaI: Index finger distal phalanx.

Flexor digitorum superficialisA: Finger flexionO: Medial epicondyle, coronoid process, and shaft of radiusI: Middle phalanges of digits 2-5.

Adductor pollicisA: Adduct thumbO: Capitate, 3rd metacarpalI: Proximal phalanx of thumb.

Abductor digiti minimi
A: AB little finger
O: Pisiform, fcu tendon
I: 5th proximal phalanx & extensor expansion

The Abductor digiti minimi muscle acts to abduct the little finger and its origin is at the pisiform, flexor carpi ulnaris tendon, while its insertion is at the 5th proximal phalanx and extensor expansion.

Explanation

The Abductor digiti minimi muscle acts to abduct the little finger and its origin is at the pisiform, flexor carpi ulnaris tendon, while its insertion is at the 5th proximal phalanx and extensor expansion.

2. What is the insertion point of the Abductor pollicis brevis muscle?

Abductor pollicis brevis
A: AB thumb
O: Scaphoid, trapezium, flexor retinaculum
I: Lateral side of 1st proximal phalanx

Base of the 5th metacarpal bone

Distal phalanx of the thumb

Medial side of 1st proximal phalanx

The Abductor pollicis brevis muscle inserts on the lateral side of the 1st proximal phalanx of the thumb, allowing it to move away from the palm.

Explanation

The Abductor pollicis brevis muscle inserts on the lateral side of the 1st proximal phalanx of the thumb, allowing it to move away from the palm.

3. Which muscle is responsible for the ADDuction of the thumb?

Abductor pollicis brevis

Flexor pollicis brevis

Extensor pollicis longus

Adductor pollicis
A: ADD thumb
O: Capitate, MC 2-3
I: 1st proximal phalanx

The Adductor pollicis muscle is responsible for the ADDuction of the thumb, while the Abductor pollicis brevis, Extensor pollicis longus, and Flexor pollicis brevis are not primarily involved in ADDuction of the thumb.

Explanation

The Adductor pollicis muscle is responsible for the ADDuction of the thumb, while the Abductor pollicis brevis, Extensor pollicis longus, and Flexor pollicis brevis are not primarily involved in ADDuction of the thumb.

4. What is the function of the Flexor digiti minimi brevis muscle?

Abduct index finger

Rotate wrist

Extend thumb

Flexor digiti minimi brevis
A: Flex little finger
O: Hamate, flexor retinaculum
I: 5th proximal phalanx

The Flexor digiti minimi brevis muscle is responsible for flexing the little finger, not extending the thumb, abducting the index finger, or rotating the wrist.

Explanation

The Flexor digiti minimi brevis muscle is responsible for flexing the little finger, not extending the thumb, abducting the index finger, or rotating the wrist.

5. What is the muscle responsible for flexing the thumb?

Flexor pollicis brevis
A: Flex thumb
O: Trapezium, trapezoid, capitate, flexor retinaculum
I: Lateral side of 1st proximal phalanx

Abductor pollicis brevis

Extensor pollicis longus

Opponens pollicis

The Flexor pollicis brevis is the muscle responsible for flexing the thumb. It originates from the trapezium, trapezoid, capitate, and flexor retinaculum, and inserts on the lateral side of the 1st proximal phalanx.

Explanation

The Flexor pollicis brevis is the muscle responsible for flexing the thumb. It originates from the trapezium, trapezoid, capitate, and flexor retinaculum, and inserts on the lateral side of the 1st proximal phalanx.

6. What is the origin, insertion, and action of the flexor pollicis longus muscle?

Flexor pollicis longus
A: flex thumb
O: Radius midshaft, interosseous membrane, Ulnar coronoid process
I: 1st distal phalanx

Abductor pollicis brevisA: abduct thumbO: Scaphoid and trapezium bonesI: Proximal phalanx of thumb.

Adductor pollicisA: adduct thumbO: MetacarpalsI: Proximal phalanx of thumb.

Extensor pollicis longusA: extend thumbO: Radius and ulnaI: Distal phalanx of the thumb.

The flexor pollicis longus muscle originates from the radius midshaft, interosseous membrane, and ulnar coronoid process, and inserts into the first distal phalanx. Its action is to flex the thumb.

Explanation

The flexor pollicis longus muscle originates from the radius midshaft, interosseous membrane, and ulnar coronoid process, and inserts into the first distal phalanx. Its action is to flex the thumb.

7. What is the function of the Lumbrical muscles in the hand?

Extend fingers at MP joints, flex fingers at IP joints

Abduct fingers at MP joints, extend fingers at IP joints

Adduct fingers at MP joints, flex fingers at IP joints

Lumbrical
A: Flex fingers at MP joints, extend fingers at IP joints
O: tendons of fdp
I: extensor expansions of fingers 2-5

The Lumbrical muscles function to flex the fingers at the metacarpophalangeal (MP) joints and extend the fingers at the interphalangeal (IP) joints. This is essential for precise and delicate movements of the fingers.

Explanation

The Lumbrical muscles function to flex the fingers at the metacarpophalangeal (MP) joints and extend the fingers at the interphalangeal (IP) joints. This is essential for precise and delicate movements of the fingers.

8. What muscle acts to oppose the little finger?

Flexor digiti minimi

Extensor digiti minimi

Opponens digiti minimi
A: Oppose little finger
O: Hamate, flexor retinaculum
I: Shaft of MC 5

Abductor digiti minimi

Opponens digiti minimi is the muscle responsible for opposing the little finger, while the other options mentioned are not involved in this specific action.

Explanation

Opponens digiti minimi is the muscle responsible for opposing the little finger, while the other options mentioned are not involved in this specific action.

9. What is the primary muscle responsible for opposing the thumb?

Abductor pollicis brevis

Opponens pollicis
A: Oppose thumb
O: Trapezium, flexor retinaculum
I: Shaft of MC 1

Extensor pollicis brevis

Flexor pollicis brevis

The primary muscle responsible for opposing the thumb is the opponens pollicis. This muscle plays a key role in allowing the thumb to move in a way that enables grasping and manipulating objects with precision.

Explanation

The primary muscle responsible for opposing the thumb is the opponens pollicis. This muscle plays a key role in allowing the thumb to move in a way that enables grasping and manipulating objects with precision.