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Anatomy Exam 6 > Posterior Arm and Forearm > Flashcards

Posterior Arm and Forearm Flashcards

1
Q

Posterior compartment of the arm innervation

A

Posterior division of brachial plexus – radial n (C5-8) and axillary n (C5-8)

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2
Q

Radial nerve branches and innervations

A
  • -Superficial (cutaneous innervation to dorsum of hand)
  • -Deep (motor innervation to extensor carpi radialis brevis, extensor digitorum, extensor digiti minimi, extensor carpi ulnaris, and supinator)
  • -Posterior interosseous (ABLE muscles)
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3
Q

Posterior compartment of the arm (general action, innervation)

A

All are EXTENSORS, all are innervated by RADIAL N

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4
Q

Triceps brachii: action

A

Long head: goes to shoulder to extend and adduct shoulder

All heads: extend elbow

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5
Q

Triceps brachii: attachments

A

Proximal attachments – long head = infraglenoid tubercle, lateral head = posterior humerus, medial head = deep/posterior humerus
Distal attachment – olecranon process

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6
Q

Anconeus: action

A

Extends and stabilizes the elbow

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7
Q

Anconeus: attachments

A

Proximal attachment – lateral epicondyle of humerus

Distal attachment – posterior ulna

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8
Q

Posterior compartment of the forearm (general action, innervation)

A

Most are extensors of wrists or digits EXCEPT brachioradialis (flexor) and supinator, all are innervated by RADIAL N

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9
Q

General origin of all posterior compartment forearm muscles

A

Originate from lateral epicondyle of humerus or posterior surface of forearm – distal attachment determines action

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10
Q

Brachioradialis: insertion

A

Process of radius

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11
Q

Brachioradialis: action

A

Flexes elbow, no action on wrist (can help out biceps and musculocutaneous n loss)

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12
Q

Extensor carpi radialis longus: insertion

A

Base of metacarpal II

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13
Q

Extensor carpi radialis longus: action

A

Extends and abducts wrist

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14
Q

Extensor carpi radialis brevis: insertion

A

Base of metacarpal III

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15
Q

Extensor carpi radialis brevis: action

A

Extends and abducts wrist

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16
Q

Extensor carpi radialis brevis: innervation

A

Deep branch of radial n

17
Q

Extensor carpi ulnaris: insertion

A

Base of metacarpal V

18
Q

Extensor carpi ulnaris: innervation

A

Deep branch of radial n

19
Q

Extensor carpi ulnaris: action

A

Extends and adducts wrist

20
Q

Extensor digitorum: insertion

A

Extensor expansion of digits 2-5

21
Q

Extensor digitorum: innervation

A

Deep branch of radial n

22
Q

Extensor digitorum: action

A

Extends digits 2-5 at all joints and assists in extending wrist

23
Q

Extensor digiti minimi: insertion

A

Extensor expansion of digit 5

24
Q

Extensor digiti minimi: action

A

Extends digit 5 at all joints and assists in extending wrist

25
Q

Extensor expansions

A

Sheets of connective tissue that join up with extensor tendons that serve as origins for other muscles

26
Q

Supinator: insertion

A

Olecranon process, proximo-lateral radius

27
Q

Abductor pollicis longus: attachments

A

Posterior ulna, radius, and interosseous membrane to base of MC I

28
Q

Innervation of ABLE muscles

A

Posterior interosseous n

29
Q

Difference between action of extensor pollicis brevis and longus

A

Brevis only extends pollex at MCP joint while longus extends at all joints

30
Q

Anatomical snuff box (contents, borders)

A 
Contents = radial artery, scaphoid bone, superficial branch of radial n
Borders = tendon of extensor pollicis longus and extensor pollicis brevis/abductor pollicis longus
31
Q

Extensor indicis: action

A

Extends digit 2 at all joints, extends wrist

32
Q

Extensor indicis: attachments

A

Origin: posterior ulna and interosseous membrane
Insertion: extensor expansion of digit 2

33
Q

Radial nerve injury

A

Caused by compression of radial nerve at any point – if on axilla or proximal arm leads to weakness of triceps, inability to extend wrist (“wrist drop”), paresthesia, numbness over dorsum of hand and posterior forearm – ex. crutch palsy (using crutches incorrectly)

34
Q

Triangular interval borders

A

Lateral: lateral head of triceps
Medial: long head of triceps
Superior: teres major

35
Q

Triangular interval contents

A

Radial nerve, profunda brachii artery

36
Q

Midshaft humeral fracture

A

Damages the contents of the triangular interval, causes wrist drop

37
Q

Handcuff palsy

A

Paresthesia or numbness over dorsum of the hand, between metacarpal I and II (superficial branch of radial nerve)

Anatomy Exam 6 (5 decks)

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