Kin 3304 - Ch7
Wrist joint actions include flexion, extension, abduction, and adduction.
True
The flexor digitorum superficialis muscle performs its action in the frontal plane.
False
The flexor pollicis longus muscle inserts on the base of the distal phalanx of the thumb on the palmar surface.
True
Which of the following is the primary function of the extensor digiti minimi muscle?
Extension of the little finger at the metacarpophalangeal joint
Each finger has three interphalangeal joints, whereas the thumb has only two.
False
In the context of wrist and hand movements, radial flexion refers to the movement of the thumb side of the hand toward the medial aspect or radial side of the forearm.
False
Which of the following is the origin of the palmaris longus muscle?
Medial epicondyle of the humerus
Which of the following muscles performs actions in the frontal plane?
The abductor pollicis longus muscle
Which of the following is the insertion of the flexor digitorum profundus muscle?
The base of the distal phalanges of the four fingers
In the context of wrist and hand movements, dorsiflexion refers to the movement of the back of the hand and/or the phalanges toward the posterior or dorsal aspect of the forearm.
True
The extensor digitorum muscle, also known as the extensor digitorum communis, is the only muscle involved in extension of all four fingers.
True
The three wrist flexors, from medial to lateral, are the flexor carpi ulnaris, palmaris longus, and flexor carpi radialis.
True
The wrist flexor muscles have their origin on the medial epicondyle of the humerus.
True
Which of these muscles may be palpated just proximal to the dorsal aspect of the wrist and approximately 1 cm medial to the radial styloid?
The extensor carpi radialis longus muscle
The flexor digitorum superficialis and the flexor digitorum profundus are finger flexors, and the flexor pollicis longus is a thumb flexor.
True
The extensors of the wrist include, from lateral to medial, the extensor carpi radialis longus, extensor carpi radialis brevis, and extensor carpi radialis.
True
Which of the following muscles may not be palpated on the dorsal aspect of the hand?
The abductor pollicis longus muscle
Which of the following muscles performs abduction of the thumb?
The abductor pollicis longus muscle
Which of the following muscles performs flexion of the thumb?
The flexor pollicis longus muscle
Which of the following is the primary function of the extensor pollicis longus muscle?
Extension of the thumb
The flexor pollicis longus muscle may be palpated on the posterior surface of the thumb.
False
Which of the following muscles performs abduction of the wrist?
The extensor carpi radialis longus muscle
In the context of wrist and hand movements, opposition refers to the movement of the thumb across the palmar aspect to oppose any or all of the phalanges.
True
In the context of wrist and hand movements, ulnar flexion refers to the movement of the little finger side of the hand toward the medial aspect or ulnar side of the forearm.
True
The fingers can only flex and extend, except at the metacarpophalangeal joints, where abduction and adduction are controlled by the intrinsic hand muscles.
True
Which of the following muscles inserts on the four tendons to bases of middle and distal phalanges of the four fingers on the dorsal surface?
The extensor digitorum muscle
Which of the following is the pointing muscle that originates between middle and distal one-third of the posterior ulna?
The extensor indicis muscle
Which of the following muscles performs extension of the index finger at the metacarpophalangeal joint?
The extensor indicis muscle
Which of the following muscles performs adduction of the wrist?
The flexor carpi ulnaris muscle
Carpal tunnel syndrome is a condition in which there is an increased pressure in the carpal tunnel, which interferes with the normal function of the median nerve.
True
