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Final Frontier Musculoskeletal > Muscles of the Forearm and Hand > Flashcards

Muscles of the Forearm and Hand Flashcards

1
Q

Extensor Carpi Radialis Longus and Brevis

A

O: Common extensor origin: lateral epicondyle of the
humerus

I: Base of 2nd metacarpal (ECRL),
I: Base of 3rd metacarpals (ECRB)

A: Wrist extension and Radial Deviation

Inv: Radial

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2
Q

Extensor Digitorum

A

O: Common extensor origin: lateral epicondyle of the
humerus

I: By four tendons, each to the base of the extensor mechanism and to the dorsal base of the proximal phalanx of the fingers

A: Extends the MCP joints, extends the IP joints of the second through fifth digits

Inv: Radial

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3
Q

Extensor Digiti Minimi

A

O: Ulnar side of the belly of the extensor digitorum

I: Tendon usually divides, joining the ulnar side of the tendon of the extensor digitorum

A: Extends the MCP joints, extends the IP joints of the little finger

Inv: Radial

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4
Q

Extensor Carpi Ulnaris

A

O: Common extensor origin: lateral epicondyle of the
humerus

I: Base of 5th metacarpal

A: Extension of wrist and ulnar deviation

Inv: Radial

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5
Q

Abductor Pollicis Longus

A

O: Posterior surface of the middle part of the radius
and ulna, and adjacent interosseous membrane

I: Base of 1st metacarpal

A: 1st digit ABD and extension at CMC joint

Inv: Radial

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6
Q

Extensor Pollicis Brevis

A

O: Posterior surface of the middle to distal parts of the radius and adjacent

I: Proximal phalanx of thumb

A: 1st digit extension at MCP, IP joints

Inv: Radial

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7
Q

Extensor Pollicis Longus

A

O: Posterior surface of the middle part of the ulna and adjacent interosseous membrane

I: Distal phalanx of thumb

A: 1st digit extension at MCP, IP joints

Inv: Radial

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8
Q

Extensor Indices

A

O: Posterior surface of the middle to distal part of the ulna and adjacent interosseous membrane

I: Tendon blends with the ulnar side of
the index tendon of the extensor digitorum

A: 2nd digit extension and wrist extension

Inv: Radial

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9
Q

Supinator

A

O: Lateral epicondyle of the humerus and supinator
crest of the ulna

I: Lateral surface of the proximal radius

A: Supination of forearm

Inv: Radial

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10
Q

Pronator Teres

A

O: Humeral head: medial epicondyle
Ulnar head: medial to the tuberosity of ulna

I: Lateral surface of the middle radius

A: Pronation of forearm, elbow flexion

Inv: Median

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11
Q

Flexor Carpi Radialis

A

O: Common flexor origin: medial epicondyle of the
humerus

I: 2nd and 3rd metacarpals

A: Wrist flexion, Radial deviation

Inv: Median

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12
Q

Flexor carpis Ulnaris

A

O: Humeral head: Common flexor origin- medial epicondyle of the humerus

Ulnar head: posterior border of the middle one third of the ulna

I: Pisiform bone, pisohamate and pisometacarpal ligaments, and palmar base of the fifth metacarpal
bone

A: Wrist flexion, Ulnar Deviation

Inv: Ulnar

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13
Q

Flexor Digitorum Superficialis

A

O: Humeroulnar head: common flexor origin, and
the medial side of coronoid process of the ulna
Radial head: oblique line just distal and lateral to the bicipital tuberosity

I: By four tendons, each to the sides of the middle phalanges of the fingers

A: Flexion of PIP joint of fingers

Inv: Median

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14
Q

Flexor Pollicis Longus

A

O: Middle part of the anterior surface of the radius and adjacent interosseous membrane

I: Distal phalanx of thumb

A: Flexion of distal phalanx of thumb

Inv: Median

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15
Q

Flexor Digitorum Profundus

A

O: Proximal 3/4 of the medial side of the ulna and
adjacent interosseous membrane

I: By four tendons, each to the palmar base of the distal phalanges of the fingers

A: Flex wrist, flex all joints to DIP in digits 2-5

Inv:
- Medial half: ulnar nerve
- Lateral half: median nerve

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16
Q

Pronator Quadratus

A

O: Anterior surface of distal ulna

I: Anterior surface of distal radius

A: Pronates forearm

Inv: Median

17
Q

Abductor Pollicis Brevis

A

O: Palmar tubercles of the trapezium and scaphoid

I: Base of proximal phalanx of thumb

A: Abduction of thumb at MCP, CMC joint

Inv: Median

18
Q

Flexor Pollicis Brevis

A

O: Transverse carpal ligament and palmar tubercle of trapezium

I: Radial side of proximal phalanx of thumb

A: Flexion of thumb

Inv: Median

19
Q

Opponens Pollicis

A

O: Transverse carpal ligament and palmar tubercle of
trapezium

I: Shaft of the thumb metacarpal

A: Opposition of thumb

Inv: Median

20
Q

Adductor Pollicis

A

O:
- Oblique head: capitate bone & base of second and
third metacarpal
- Transverse head: palmar surface of 3rd metacarpal

I: Ulnar side of the base of the proximal phalanx of the thumb

A: Adduction of thumb

Inv: Ulnar

21
Q

Abductor Digiti Minimi

A

O: Pisiform bone, and tendon of the flexor carpi ulnaris

I: Base of the proximal phalanx of the
little finger

A: Abduction of the little finger at MCP joint

Inv: Ulnar

22
Q

Flexor Digiti Minimi

A

O: Hook of the hamate

I: Base of the proximal phalanx of the little finger

A: Flexion of little finger

Inv: Ulnar

23
Q

Opponens Digiti Minimi

A

O: Transverse carpal ligament & hook of the hamate

I: Shaft of the fifth metacarpal

A: Flexion of 5th metacarpal, lateral rotation producing opposition

Inv: Ulnar

24
Q

Lumbricals of the hand

A

O:
- First and second: Radial
surface of the flexor
profundus tendons of the
index and middle fingers,
respectively.
- Third: Adjacent sides of the
flexor profundus tendons of
the middle and ring fingers.
- Fourth: Adjacent sides of
the flexor profundus
tendons of the ring and little
fingers

I: Into the radial border of the extensor
expansion on the dorsum of the respective digits

A: Flexion at MCP, Extension at IP

Inv:
- Medial two: ulnar nerve
- Lateral two: median nerve

25
Q

Dorsal Interossei (DAB)

A

O:
First: adjacent sides of the first and second
metacarpal
Second: adjacent sides of the second and third
metacarpal
Third: adjacent sides of the third and fourth metacarpal
Fourth: adjacent sides of the fourth and fifth
metacarpal

I:
First: Radial side of the index finger, chiefly to the base of the proximal phalanx
Second: Radial side of the middle finger
Third: Ulnar side of the middle finger, chiefly into extensor expansion
Fourth: Ulnar side of the ring finger

A: Abduction of 2nd, 3rd, 4th digits away from middle finger

Inv: Ulnar

26
Q

Palmar Interossei (PAD)

A

O:
First: ulnar side of the thumb metacarpal
Second: ulnar side of the second metacarpal
Third: radial side of the fourth metacarpal
Fourth: radial side of the fifth metacarpal

I:
First: Ulnar side of the thumb.
Second: Ulnar side of the index finger.
Third: Radial side of the ring finger.
Fourth: Radial side of the little finger.

A: Adduction of 2nd, 4th, 5th digits towards middle finger, flexion of digit at MCP, extension at IP

Inv: Ulnar

Final Frontier Musculoskeletal (95 decks)

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