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COM - MSK > Ant. and Post. Forearm > Flashcards

Ant. and Post. Forearm Flashcards

1
Q

what is the primary blood supply to the post. forearm?

A

radial a.
recurrent interosseous a.
post. interosseous a.
ulnar a.

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2
Q

what supplies the ant. hand?

A

sup. palmar arch - ulnar a.

deep palmar arch - radial a.

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3
Q

what are the muscles of the superficial ant. forearm?

A 
PASS FAIL PASS FAIL
pronator teres
flexor carpi radialis 
palmaris longus
flexor carpi ulnaris
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4
Q

what is the innervation of most ant. forearm muscles?

blood?

A

Median n. (except) flexor carpi ulnaris

ulnar a. except pronator teres

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5
Q

pronator teres action

blood?

A

pronate and flex forearm @ elbow

ant. ulnar recurrent a.

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6
Q

flexor carpi radialis action

A

flex and ABduct hand @ wrist

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7
Q

Palmaris longus action

A

flex hand @ wrist, tenses palmar aponeurosis

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8
Q

flex carpi ulnaris action

innervation

A

flex and ADDuct hand at wrist

ulnar n. (C7, 8)

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9
Q

what happens in Cubital Tunnel Syndrome?

A

ulnar n. compressed by the humeral and ulnar heads of flexor carpi ulnaris

numbness and tingling in medial part of palm and medial digits

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10
Q

what muscles is in the intermediate layer?

action?

innervation?

A

flexor digitorum superficialis

flexes middle phalanges at prox IP joint
flexes prox phalanges at MP joint

median n. (C7, C8, T1)

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11
Q

what muscles make up the deep layer?

blood supply?

A

Flexor digitorum profundus
Flexor pollicus longus
Pronator quadratus

ant. interosseous a.

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12
Q

flexor digitorum profundus action

innervation

A

flexes distal phalanges at IP joints

median and ulnar n. (C8, T1)

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13
Q

Flexor pollicus longus action

innervation

A

flex thumb

median n. via. ant. interosseous (C8, T1)

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14
Q

Pronator quadratus action

innervation

A

pronate forearm, deep fibers bind radius and ulna

median n. via ant. interosseous n. (C8, T1)

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15
Q

which muscle is responsible for the power grip?

A

Flexor digitorum profundus

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16
Q

what does the Ulnar n. travel through?

A

Guyon’s canal lateral to pisiform

17
Q

which muscles does the radial n. innervate?

A

brachioradialis

extensor carpi radialis longus

18
Q

what muscles does the deep radial n. innervate?

A

extensor carpi radialis brevis

supinator

19
Q

which muscles does the post. interosseous n. innervate?

A

Extensor carpi ulnaris, digitorum, digiti minimi, indicis, pollicus longus and brevis
Abductor pollicus longus

7 total

20
Q

brachioradialis action

innervation

A

flex forearm when pronated (mid prone)

radial n. (C5,6,7)

21
Q

extensor carpi radialis longus action

innervation

A

extend and ABduct hand @ wrist

radial n. (C6,7)

22
Q

extensor carpi radialis brevis action

innervation

A

extend and ABduct hand @ wrist

deep branch radial n. (C7,8)

23
Q

extensor digitorum action

innervation

A

extend medial 4 fingers at MP joints, sometimes IP

post. interosseous n. (C7,8)

24
Q

extensor digiti minimi action

innervation

A

extend 5th finger at MP joint and also at IP joint

post. interosseous n. (C7,8)

25
Q

extensor carpi ulnaris action

innervation

A

extend and ADDuct hand @ wrist

post. interosseous n. (C7,8)

26
Q

Supinator action

innervation

A

supinate forearm, bring radial head back to anatomical position

deep branch radial n. (C7,8)

27
Q

extensor indicis action

innervation

A

independent extension of 2nd finger, helps extension @ wrist

post interosseous n. (C7,8)

28
Q

abductor pollicus longus action

innervation

A

ABduct thumb and extend at CMP joint

post. interosseous n. (C7,8)

29
Q

Extensor pollicus brevis action

innervation

A

extend PROX phalanx of thumb at MP joint
extend CMP joint

post. interosseous n. (C7,8)

30
Q

extensor pollicus longus action

innervation

A

extend DISTAL phalanx of thumb @ IP joint, extend CMP joint

post. interosseous n. (C7,8)

31
Q

anatomical snuff box:
floor?

roof?

A

scaphoid bone

superficial radial n. and fascia

32
Q

what are the “outcropping muscles”

A

ABductor pollicus longus
extensor pollicus longus
extensor pollicus brevis

33
Q

when looking at your hand as it is mid-pronation what is in the anatomical snuff box lateral to medial?

A

extensor pollicus longus

extensor pollicus brevis

ABductor pollicus longus
(anatomically most lateral)

34
Q

what is the primary blood supply to the ant. forearm?

A

ulnar a.

ant. interosseous a.

COM - MSK (12 decks)

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