Forearm, Wrist and Hand Flashcards
What are the three major parts of the hand from proximal to distal?
Wrist
Metacarpals
Fingers
Name these parts from proximal to distal
What is the only finger than has only two phalanges? As opposed to three for all the other ones.
The thumb
How many carpal bones are in your wrist?
8
What shape do your carpal bones form?
Arch
What does the mnemonic,
Some
Lovers
Try
Positions
That
They
Cannot
Handle
Stand for?
Scaphoid
Luante
Triquetrum
Pisiform
Trapezium
Trapezoid
Capitate
Hammate
Review this radiograph of the wrist bones
What does the trapezium articulate with?
What about the capitate?
Trapezium: Base of first metacarpal
Capitate: Base of third metacarpal
Where do the blood vessels enter through the wrist?
At the distal scaphoid
What is a potential risk of a scaphoid fracture?
Cuts off blood supply to the proximal part of the scaphoid. This leads to avascular necrosis
What is the most commonly dislocated carpal bone?
The Lunate
What type of join is the trapezium? Why is it important?
Saddle joint
Allows for wide range of motion
Regarding the carpometacarpal joints, what type of joint is the first carpometacarpal articulation and what does it allow u to do?
Saddle joint
Allows for crossing of the thumb over the palm
Allows for gripping
Why does radiocarpal articulation not include the distal end of the ulna?
Because the ulna is separated from the carpal bones by an articular disc
Gloss over this image of the joints of the wrist
Names of the long flexors of fingers 2 to 5?
Flexor digitorum superficialis
Flexor digitorum profundus
Which long flexor of the wrist, in addition to flexing the second through fifth fingers, also assits to flex the wrist (radiocarpal joint?)
Flexor digitorum profundus
True of false
The flexor digitorum superificalis also helps flex the wrist
True. Both of the long flexors of the fingers flex the wrist
What are the two major long extensors of the fingers?
Extensor digitorum
Extensor indicis
Which extensor of the fingers is used for pointing?
Extensor indicis
(think indicate)
Functions of the extensor indicis
Extends and adducts the second finger
Used for pointing
What are the three long extensors of the thumb
Abductor pollicis longus
Extensor pollicis brevis
Extensor pollicis longus
Which of the three long muscles of the thumb, in addition to extend the thumb and abducting the wrist, also helps to abduct the thumb?
Abductor pollicis longus
Where does the carpal tunnel extend from?
From scaphoid and trapezium laterally (radial side) to the pisiform and hook of the hamate medially (ulna side)
What is a tendom sheath?
Layer of membrane around a tendon
Functions of the flexor pollicis brevis
Flexes the thumb through the carpometacarpal and metacarpophalangeal joints
Assists in opposition of the thumb
What muscle is not pat of the thenar eminence but still helps with the movement of the thumb?
Adductor Pollicis
Which three arteries supply the hand?
Brachial, ulnar and radial
Which two arteries for a interconnected, superficial deep arch?
Ulnar and Radial
What does the dorsal venous network drain into?
The cephalic (laterally) and basilic veins (medially). See image
Which two fingers does the ulnar nerve stimulate?
Pinky and Ring
Which fingers does the median nerve stimulate?
Thumb, pointer, middle and part of the ring
Good luck on the exam guys
[See front of the card]
