2. What movement is taking place when the thumb is moved anteriorly in the sagit

Question

2. What movement is taking place when the thumb is moved anteriorly in the sagittal plane? a Carpometacarpal flexion b. Carpometacarpal adduction c. Carpometacarpal extension d. Carpometacarpal abduction In which of the following muscle pairs is the principle of neutralization possible? Extensor Pollicis Longus & Extensor Pollicis Brevis Extensor Carpi Radialis Longus & Extensor Carpi Radialis Brevis Flexor Carpi Radialis & Extensor Carpi Ulnaris Extensor Carpi Ulnaris & Flexor Carpi Ulnaris a. b. c. d. 0 Which of the following is not one of the movements caused by the lumbricals? a. b. c. d. Flexion of the metacarpophalangeal joints of the four fingers Flexion of the proximal interphalangeal joints of the four fingers Extension of the distal interphalangeal joints of the four fingers Extension of the proximal interphalangeal joints of the four fingers

Explanation / Answer

1.a) Carpometacarpal flexion- It is the forward movement of the thumb in the sagittal plane

carpometacarpal extension- moving the thumb backward in sagittal plane

Carpometacarpal Adduction- approximating the thumb to the palm in the coronal plane

Carpometacarpal abduction- Movin the thumb away from the palm in the coronal plane.

2.b)Neutralizers- These are the muscles that prevent unwanted movements.

example- to grasp an object , we need to flex the fingers, this causes an extra flexion in the wrist too which is unwanted . It is overcome by the wrist extensor muscles , which are given in the option b.

3.b) Lumbricals causes flexion of the metacarpophalangeal joints of the four fingers, and extion of both proximal and distal interphalangeal joints.

It does not cause the flexio of any interphalangeal joint.

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