SM_229a: Functional Anatomy of the Hand Flashcards Preview

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Flashcards in SM_229a: Functional Anatomy of the Hand Deck (61)
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1

The ulna articulates with the _____

The ulna articulates with the trochlea of the humerus

2

Radius articulates with the ____ of the humerus

Radius articulates with the capitulum of the humerus

3

Label the relevant landmarks on a right elbow AP x-ray

4

Label the bones of the right wrist

5

Trapezium articulates with the ____

Trapezium articulates with the thumb

6

____ has a rounded head

Capitate has a rounded head

7

Hamate has a ____, which defines the ____

Hamate has a hook, which defines the carpal tunnel

8

Most common fractures of the wrist are the _____ and _____

Most common fractures of the wrist are distal radius and scaphoid

 

(occur from breaking a fall with an outstretched hand)

9

Colles fracture of the radius involves a _____ deformity

Colles fracture of the radius involves a dinner fork deformity

 

(distal segment displaced dorsally)

10

Scaphoid fracture may lead to _____ in the proximal segment

Scaphoid fracture may lead to avascular necrosis in the proximal segment

11

If you can see both the radius and ulna when a scaphoid fracture is imaged, the orientation is _____

If you can see both the radius and ulna when a scaphoid fracture is imaged on CT, the orientation is coronal orientation

 

(if you only see the radius or the ulna) the CT is sagittal

12

Describe the ligaments and articular disc of wrist joint

Ligaments and articular disc of wrist joint

  • Annular ligament hold radius against ulna
  • Interosseous membrane holds radius and ulna together
  • Articular cartilage at end of radius continues

13

Describe the important muscles of the forearm

Forearm

  • Pronator teres is active in pronation
  • Brachioradialis is anterior to axis and acts as flexor (strongest when forearm is halfway between flexion and extension)

14

During pronation/supination, head of the ____ pivots on the ____ of the humerus

During pronation/supination, head of the radius pivots on the capitulum of humerus

 

(pronator quadratus goes from radius to ulna)

15

Muscles on deep group of the forearm are ____, ____, and ____

Muscles on deep group of the forearm are flexor pillicis longus, flexor digitorum profundus, and pronator quadratus

16

Palmar aponeurosis is a ____ that functions to ____

Palmar aponeurosis is a broad flat tendon that functions to strengthen group

 

(distal attachment is to tendon sheaths)

17

____ branch of the ____ nerve is the motor branch to the thenar compartment and is superficial and susceptible to injury

Recurrent branch of the median nerve is the motor branch to the thenar compartment and is superficial and susceptible to injury

18

Dupuytren contracture is when the _____ contracts with fibrosis and fingers become _____ over time

Dupuytren contracture is when the palmar aponeurosis contracts with fibrosis and fingers become flexed over time

19

____ nerve passes through the carpal tunnel with the long flexor tendon

Median nerve passes through the carpal tunnel with the long flexor tendon

 

(ulnar artery is superficial)

(flexor retinaculum is connective tissue that holds down flexors and closes off the carpal tunnel)

20

In carpal tunnel syndrome, repetitive use of fingers results in swelling of _____ and compression of the _____ nerve, causing loss of or decreased _____ function

In carpal tunnel syndrome, repetitive use of fingers results in swelling of synovial tendon and compression of the median nerve, causing loss of or decreased thumb function

21

Synovial sheaths function to _____

Synovial sheaths function to reduce friction

22

Fibrous tendon sheaths function to _____ and _____

Fibrous tendon sheaths function to anchor the tendons and act as pulleys

23

_____ of digit _____ is continuous with the common flexor sheath at the wrist

Synovial sheath of digit V is continuous with the common flexor sheath at the wrist

24

____ are discontinuous mesotendons

Vincula are discontinuous mesotendons

25

Common sheath wraps the _____ and _____ tendons

Common sheath wraps the superficialis and profundus tendons

26

____ is an extensor seen in the posterior view of the right forearm

Extensor digitorum is an extensor seen in the posterior view of the right forearm

27

____ is in the anatomical snuff box

Radial artery is in the anatomical snuff box

28

In anatomical position, _____ of the thumb is a pure lateral movement

In anatomical position, extension of the thumb is a pure lateral movement

29

_____ of the thumb is a straight anterior movement

Abduction of the thumb is a straight anterior movement

30

Describe intrinsic muscle functions around the anterior-posterior axis at MC joints

Intrinsic muscle functions around the anterior-posterior axis at MC joints\

  • Dorsal interossei abduct
  • Palmar interossei adduct
  • Lumbricals radially deviate

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