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Gross Anatomy II NYCC > Posterior Forearm (Posterior Antebrachium) > Flashcards

Posterior Forearm (Posterior Antebrachium) Flashcards

1
Q

When looking at the forearm posteriorly, which side is considered medial?

A

Ulnar side

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2
Q

cutaneous innervation

Which nerve runs medially in the posterior antebrachium?

A

Medial antebrachial cutaneous nerve

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3
Q

cutaneous innervation

Which nerve runs laterally and in the middle of the posterior antebrachium?

A

Posterior antebrachial cutaneous nerve (radial nerve)

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4
Q

cutaneous innervation

Which nerve runs towards the wrist, laterally in the posterior antebrachium?

A

Lateral antebrachial cutaneous nerve

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5
Q

cutaneous innervation

Which nerve runs on the medial side of the posterior hand?

A

Dorsal cutaneous branch of ulnar nerve

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6
Q

cutaneous innervation

Which nerve runs on the lateral side of the posterior hand?

A

Superficial branch of radial nerve

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7
Q

cutaneous innervation

Which nerve will run to the posterior tips of the first four digits?

A

Median nerve

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8
Q

Which nerves innervate the flexors and pronators of the forearm?

A

Median nerve,
Anterior interosseous nerve

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9
Q

Which nerves innervate the extensors and supinators of the forearm?

A

Posterior interosseous nerve
Deep branch of radial nerve
Radial nerve

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10
Q

Which muscles in the posterior forearm are innervated by the radial nerve?

A
  • Anconeus
  • Brachioradialis
  • Extensor carpi radialis longus
    (all superficial layer)
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11
Q

Which muscles in the posterior forearm are innervated by the deep branch of radial nerve?

A
  • Extensor carpi radialis brevis (superficial)
  • Supinator (deep)
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12
Q

Which muscles of the superficial layer of the posterior forearm are innervated by the posterior interosseous nerve?

A
  • Extensor digitorum
  • Extensor digiti minimi
  • Extensor carpi ulnaris
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13
Q

Which muscles of the deep layer of the posterior forearm are innervated by the posterior interosseous nerve?

A
  • Abductor pollicis longus
  • Extensor pollicis longus
  • Extensor pollicis brevis
  • Extensor indicis
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14
Q

Origin and insertion of anconeus

A

Origin: lateral epicondyle of humerus
Insertion: lateral side of the olecranon, and shaft of the ulna, joint capsule of the elbow

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15
Q

Innervation and spinal levels of anconeus

A

Radial nerve form C7, C8, T1

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16
Q

Actions of anconeus

A

Assists triceps brachii and extends joint capsule of the elbow during extension of the elbow

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17
Q

Origin and insertion of brachioradialis

A

Origin: upper 2/3rds of the lateral supracondylar ridge of the humerus
Insertion: lateral aspect of the styloid process of the radius

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18
Q

Innervation and spinal levels of brachioradialis

A

Radial nerve from C5, mostly C6, C7

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19
Q

Action of brachioradialis

A

Flexes a semiprone forearm

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20
Q

Origin and insertion of extensor carpi radialis longus

A

Origin: lower 1/3rd of the lateral supracondylar ridge of the humerus
Insertion: base of the 2nd metacarpal

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21
Q

Innervation and spinal levels of extensor carpi radialis longus

A

Radial nerve from C6 and C7

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22
Q

Actions of extensor carpi radialis longus

A

Extends the wrist
Acts in unison with flexor carpi radialis to abduct or radially deviate the hand
Fixes the wrist when acting with extensor carpi ulnaris

23
Q

Origin and insertion of extensor carpi radialis brevis

A

Origin: lateral epicondyle of the humerus
Insertion: base of 3rd metacarpal

24
Q

Innervation and spinal levels of extensor carpi radialis brevis

A

Deep branch of the radial nerve mostly from C7, C8

25
Q

Action of extensor carpi radialis brevis

A

Assists extensor carpi radialis longus

26
Q

Origin and insertion of extensor digitorum

A

Origin: lateral epicondyle of the humerus via common extensor tendon
Insertion: dorsal digital expansions of the medial four digits

27
Q

Innervation and spinal levels of extensor digitorum

A

Posterior interosseous nerve from mostly C7 and C8

28
Q

Action of extensor digitorum

A

Extend the metacarpophalangeal and interphalangeal joints

29
Q

Origin and insertion of extensor digiti minimi

A

Origin: medial belly of extensor digitorum
Insertion: dorsal digital expansion of the little finger via 1 or 2 tendons

30
Q

Innervation and spinal levels of extensor digiti minimi

A

Posterior interosseous nerve from mostly C7 and C8

31
Q

Action of extensor digiti minimi

A

Assists extensor digitorum at the little finger

32
Q

Origin and insertion of extensor carpi ulnaris

A

Origin: lateral epicondyle of humerus
Insertion: medial side base of the 5th metacarpal

33
Q

Innervation and spinal levels of extensor carpi ulnaris

A

Posterior interosseous nerve from C7, mostly C8

34
Q

Actions of extensor carpi ulnaris

A
  • Acting with flexor carpi ulnaris, it will adduct or ulnar deviate the hand
  • Acting with extensors carpi radialis longus and brevis, it will fix the wrist
  • Can also extend the wrist
35
Q

Origin and insertion of supinator

A

Origin: lateral epicondyle of the humerus, the radial collateral ligament, supinator crest of the ulna
Insertion: lateral surface of the proximal 1/3rd of the radius

36
Q

Innervation and spinal levels of supinator

A

Deep branch of the radial nerve from C5, mostly C6

37
Q

Action of supinator

A

Supinates forearm

38
Q

Origin and insertion of abductor pollicis longus

A

Origin: posterior surfaces of the radius, ulna, and interosseous membrane
Insertion: base of the 1st metacarpal and trapezium

39
Q

Innervation and spinal levels of abductor pollicis longus

A

Posterior interosseous nerve from C7 and mostly C8

40
Q

Action of abductor pollicis longus

A

Abducts and extends the thumb

41
Q

Origin and insertion of extensor pollicis brevis

A

Origin: posterior surface of the radius and interosseous membrane
Insertion: base of the proximal phalanx of the thumb

42
Q

Innervation and spinal levels of extensor pollicis brevis

A

Posterior interosseous nerve from C7 and mostly C8

43
Q

Action of extensor pollicis brevis

A

Extends the metacarpophalangeal joint

44
Q

Origin and insertion of extensor pollicis longus

A

Origin: posterior shaft of the ulna and interosseous membrane
Insertion: base of the distal phalanx of the thumb

45
Q

Innervation and spinal levels of extensor pollicis longus

A

Posterior interosseous nerve from C7 and mostly C8

46
Q

Action of extensor pollicis longus

A

Extends the thumb at the interphalangeal and metacarpophalangeal joints

47
Q

Origin and insertion of extensor indicis

A

Origin: posterior surface of interosseous membrane, posterior surface of the ulna
Insertion: dorsal digital expansion of the index finger

48
Q

Innervation and spinal levels of extensor indicis

A

Posterior interosseous nerve from C7 and mostly C8

49
Q

Action of extensor indicis

A

Extends index finger assisting extensor digitorum

50
Q

What makes up the medial boundary of the anatomical snuff box?

A

Extensor pollicis longus

51
Q

What makes up the lateral boundary of the anatomical snuff box?

A

Extensor pollicis brevis, abductor pollicis longus

52
Q

The medial 1 and 1/2 digits are innervated by the…

A

ulnar nerve

53
Q

The proximal 1/3rd, and lateral 3 and 1/2 digits are innervated by the…

A

superficial branch of the radial nerve

Gross Anatomy II NYCC (18 decks)

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