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Clinical Anatomy 1 Maddy > Posterior Forearm > Flashcards

Posterior Forearm Flashcards

1
Q

What are the attachments of the extensor carpi radialis longus muscle? ECRL

A

from the lateral epicondyle of the humerus to the base of the 2nd metacarpal.

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2
Q

What are the attachments of the extensor carpi radialis brevis muscle? ECRB

A

From the lateral supracondylar ridge of the humerus to the base of the 3rd metacarpal

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3
Q

What are the attachments of the extensor carpi ulnaris muscle? ECU

A

From the later epicondyle of the humerus to the base of the 5th metacarpal

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4
Q

What are the attachments of the extensor digitorium msucle?

A

from the lateral epicondyle of the humerus to the extensor expansions of digits 2-5

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5
Q

What are the attachments of the extensor digit minimi muscle? EDM

A

from the lateral epicondyle of the humerus to the digital expansion of the 5th digit

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6
Q

What are the attachments of the brachioradialis?

A

from the lateral supracondylar ridge of the humerus to the distal radius lateral to the styloid process

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7
Q

What are the superficial muscles of the posterior forearm?

A

Brachioradialis, Extensor carpi radialis longus, Extensor carpi radialis brevis, Extensor carpi ulnaris, Extensor digitorum, and Extensori digiti minimi

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8
Q

What is the common extensor origin?

A

The lateral epicondyle of the humerus

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9
Q

What are the actions of the brachioradialis muscle?

A

flexes the elbow

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10
Q

What are the actions of the extensor carpi radialis longus muscle?

A

extends and abducts hand at wrist (radial deviation) & assists in flexion of the elbow

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11
Q

What are the actions of the extensor carpi radialis brevis muscle?

A

extends and abducts hand at wrist (radial deviation)

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12
Q

What are the actions of the extensor carpi ulnaris muscle?

A

extends and adducts hand at wrist (ulnar deviation)

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13
Q

What are the actions of the extensor digitorum muscle?

A

extends phalanges (primarily at metacarpophalangeal, secondarily at interphalangeal)

extends hand at wrist

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14
Q

What are the actions of the extensor digiti minimi muscle?

A

Extends 5th digit @ metacarpophalangeal and interphalangeal

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15
Q

What are the innervations of the brachioradialis muscle?

A

radial nerve (C5-C6)

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16
Q

What are the innervations of the extensor carpi radialis longus muscle?

A

radial nerve (C6-C8)

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17
Q

What are the innervations of the extensor carpi radialis brevis muscle?

A

radial nerve (C6-C8)

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18
Q

What are the innervations of the extensor digitorum muscle?

A

radial nerve (C6-C8)

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19
Q

What are the innervations of the extensor digiti minimi muscle?

A

radial nerve (C7-C8)

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20
Q

What are the innervations of extensor carpi ulnaris muscle?

A

radial nerve (C6-C8)

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21
Q

What are the deep muscles of the posterior forearm?

A

Supinator and Extensor Indicis

22
Q

What are the attachments of the supinator muscle?

A

from the lateral epicondyle of the humerus, radial collateral ligament & supinator crest of the ulna to the lateral surface of the proximal radius

23
Q

What are the attachments of the extensor indicis muscle?

A

from the posterior surface of the ulna & interosseous membrane to the digital expansion of the 2nd digit

24
Q

what are the actions of the supinator muscle?

A

supinates forearm

25
Q

What are the actions of the extensor indicis muscle?

A

extends 2nd digit @ metacarpophalangeal and interphalangeal

26
Q

What are the innervations of the supinator muscle?

A

radial nerve

27
Q

What are the innervations of the extensor indicis muscle?

A

radial nerve

28
Q

What are the outcropping thumb muscles of the posterior forearm?

A

Abductor pollicis longus, extensor pollicis brevis, and extensor pollicis longus

29
Q

What are the attachments of the abductor pollicis longus?

A

from the proximal posterior radius, ulna & interosseous membrane for the base of the 1st metacarpal & trapezium

30
Q

What are the attachments of the extensor pollicis longus?

A

from the middle 1/3 of the posterior surface of the ulna & interosseous membrane to the base of the 1st distal phalanx

31
Q

What are the attachments of the extensor pollicis brevis?

A

from the posterior radial surface of the ulna & interosseous membrane to the base of the 1st distal phalanx

32
Q

What are the actions of the abductor pollicis longus?

A

abducts & extends thumn at carpometacarpal joint

& abducts hand at wrist (radial deviation)

33
Q

What are the actions of the extensor pollicis longus?

A

extends thumb @ CMC, metacarpophalangeal & interpahalngeal joints

34
Q

What are the actions of the extensor pollicis brevis?

A

extends thumb @ metacarpophalangeal

& extends and abducts CMC joint

35
Q

What are the innervations of the abductor pollicis longus?

A

radial nerve

36
Q

What are the innervations of the extensor pollicis longus?

A

radial nereve

37
Q

What are the innervations of the extensor pollicis brevis?

A

radial nerve

38
Q

What is the name of the thick, deep fascia extension of the antebrachial fascia?

A

Extensor retinaculum

39
Q

What are the contents of the extensor retinaculum?

A

6 muscles’ tendons pass deep to the fascia

  1. EPB and APL
  2. EPR longus & brevis
  3. EPL
  4. Tendon sheath for extensor digitorum & extensor indicis
  5. Extensor digit minimi
  6. Extensor carpi ulnaris
40
Q

What are the general actions of the extensor retinaculum?

A

Directs tendons in a precise way for precis movements

41
Q

The skin of the posterior medial forearm is associated with which dermatome?

A

T1

42
Q

The skin of the axillary region is associated with which dermatome?

A

T2

43
Q

The dermatome of the axillary region is associated with which spinal nerve?

A

T2

44
Q

The dermatome of the proximal half of the posterior and anterior medial arm is associated with which spinal nerve?

A

T2

45
Q

The dermatome of the anterior and posterior medial forearm and the skin of the distal half of the medial arm is associated with which spinal nerve?

A

T1

46
Q

The dermatome of the shoulder is associated with which spinal nerve?

A

C4

47
Q

The dermatome of the digits 4,5 is associated with which spinal nerve?

A

C8

48
Q

The dermatome of digits 2-4 is associated with which spinal nerve?

A

C7

Primarily index finger

49
Q

The dermatome of the thumb is associated with which spinal nerve?

A

C6

50
Q

The dermatome of the lateral arm and forearm are associated with which spinal nerve?

A

C5

Clinical Anatomy 1 Maddy (8 decks)

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