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Anatomy 2 > 6) Thumb joints > Flashcards

6) Thumb joints Flashcards

1
Q

1st Carpometacarpal Joint

A

Saddle, simple, synovial,multiaxail

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2
Q

1st Carpometacarpal Joint

Articular surface

A

See file

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3
Q

1st Carpometacarpal Joint

Joint capsule

A

See file

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4
Q

1st Carpometacarpal Joint

Ligaments

A

Radial carpometacarpal ligament

Anterior oblique ligament

Posterior oblique ligament

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5
Q

Radial carpometacarpal ligament

A

Attachments:

Passes between adjacent lateral surfaces of trapezium and 1st metacarpal

Prevents lateral displacement of metacarpal on trapezium

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6
Q

Anterior oblique ligament

A

Attachments

Anterior trapezium to medial side of 1st metacarpal

Taut extension of thumb

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7
Q

Posterior oblique ligament

A

Attachments

Posterior surface of trapezium to medial side of 1st metacarpal

Taut in flexion

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8
Q

Stability

Carpometacarpal

A

Tone of muscle
Tendons
Shape of articular surface + looseness = mobile

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9
Q

Movements

Carpometacarpal

A

Flexion
Extension
Abduction
Opposition

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10
Q

Metacarpophalangeal

A

Condyloid, simple, synovial, multiaxail

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11
Q

Metacarpophalangeal

Articular surface

A

See file

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12
Q

Metacarpophalangeal

Joint capsule

A

See file

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13
Q

Metacarpophalangeal

Synovial membrane

A

Lines all non-articular surfaces of joint present anterior and posterior recesses when joint is extended

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14
Q

Metacarpophalangeal

Ligaments

A

Palmar ligament

Collateral ligament

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15
Q

Palmar ligament

Metacarpophalangeal

A

Dense fibrocartilaginous pad increases phalangeal articular surface anteriorly

Anterior surface base of proximal phalanx

Contains x2 sesamoid bones attracted

Limits extension

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16
Q

Collateral ligament

Metacarpalphalangeal

A

V strong, fan out proximal to distal

Attachments:

Proximally to tubercle and adjacent depression on side of metacarpal head ➖➖➖➖ palmar aspect side of base of proximal phalanx

Taut in flexion

17
Q

Stability

Metacarpophalangeal

A

Collateral ligament

Tendons flexor, extensor pollicis longus

18
Q

Movement

Metacarpophalangeal

A 
Flexion 
Extension
Abduction 
Adduction 
Opposition
19
Q

Interphalangeal

A

Hinge,simple,synovial, uniaxail

20
Q

Interphalangeal

Collateral ligament

A

Attachments:

Sides of head of proximal phalanx➖➖➖ palmar aspect base of distal phalanx

Blend lateral palmar ligament

Limit flexion

21
Q

Interphalangeal

Palmar ligament

A

Fibrocartilaginous plate attached to anterior margin of base of distal phalanx

Limit extension

22
Q

Interphalangeal

Stability

A

Palmar ligament

collateral ligament

23
Q

Interphalangeal

Movement

A

Flexion

Extension

24
Q

Interphalangeal

Articular surfaces

A

See file

25
Q

Interphalangeal

Joint capsule

A

See file

26
Q

Interphalangeal

Ligaments

A

Collateral

Palmar

27
Q

Thumb grips

A

Percision grips— object is held between pads of digits

Rotation of CMC, MCP joints of thumb and MCP joint of fingers using intrinsic muscles of the hand and flexor digitorum superficialis, profundus and pollicis longissumus

1) Pincer: terminal opposition
2) Pinch: subterminal opposition
3) Key: subtermino-lateral opposition

Power grips—- used when considerable power is required using long flexors and extensors partly fixing the wrist and gripping the object

1) Palmar
2) Hook
3) Span

28
Q

Dexterity

A

Achieved through a coordinated mix of precision and power through the available ROM

Skill in performance movements

29
Q

Terminal opposition

Pincer grip

A

Most precise

Tips of pads or or edges of the nails

30
Q

Subterminal opposition

Pinch grip

A

Most common

Palmar surfaces of thumb and finger

31
Q

Subtermino-lateral opposition

Key grip

A

Less fine but strong grip

Pad of thumb presses against the side of any of the phalanges of fingers

when the distal phalanx of the index finger is lost it can replace terminal and sub terminal opposition

32
Q

Palmar grip

A

Most powerful grip

Thumb acts as a buttress and the fingers wrap around the object

The volume of the object determines the strength of grip which is greatest when the tips of the index finger and thumb can still touch

33
Q

Hook grip

A

The object is held firmly between the palm and flexed fingers

34
Q

span grip

A

Abducted fingers and thumb in addition to the palm in order to grip circular objects e.g. Jar lids

Anatomy 2 (12 decks)

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