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Anatomy > Extensor Compartment of Upper Limb and Upper Back > Flashcards

Extensor Compartment of Upper Limb and Upper Back Flashcards

1
Q

Origin of long head of triceps brachii

A

Infraglenoid tubercle

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2
Q

Origin of lateral head of triceps brachii

A

Humerus, superior to the radial groove

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3
Q

Origin of medial head of triceps brachii

A

Humerus, inferior to radial groove

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4
Q

Attachment of triceps brachii

A

The heads converge onto one tendon and insert into the olecranon of the ulna

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5
Q

Function of triceps brachii

A

Extension of the arm at the elbow

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6
Q

Innervation of triceps brachii

A

Radial nerve

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7
Q

How many muscles are in the superficial layer of the posterior forearm

A

7

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8
Q

Origin and attachments of brachioradialis

A

Originates from the lateral supracondylar ridge of humerus

Attaches to the distal end of the humerus

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9
Q

Actions of brachioradialis

A

Flexes at the elbow

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10
Q

Innervation of brachioradialis

A

Radial nerve

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11
Q

Origin and attachments of extensor carpi radialis longus

A

Originates from the supracondylar ridge

Their tendons attach to metacarpal bones II and III

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12
Q

Origin and attachments of extensor carpi radialis brevis

A

Originates from the lateral epicondyle

Their tendons attach to metacarpal bones II and III

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13
Q

Action of extensor carpi radialis longus and brevis

A

Extends and abducts the wrist

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14
Q

Innervation of extensor carpi radialis longus and brevis

A

Radial nerve

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15
Q

Origin and attachment of extensor digitorum

A

Originates from lateral epicondyle

Splits into four and inserts into the extensor hood of each finger

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16
Q

Action of extensor digitorum

A

Extends four fingers at metacarpophalangeal joint and interphalangeal joints

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17
Q

Innervation of extensor digitorum

A

Radial nerve (deep branch)

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18
Q

Origin and attachment of extensor digiti minimi

A

Originates from lateral epicondyle

Attaches with the extensor digitorum tendon into the extensor hood of the little finger

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19
Q

Actions of extensor digiti minimi

A

Extends the little finger

Contributes to extension at the wrist

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20
Q

Innervation of extensor digiti minimi

A

Radial nerve (deep branch)

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21
Q

Origin and attachment of extensor carpi ulnaris

A

Originates from the lateral epicondyle

Attaches to base of metacarpal V

22
Q

Action of extensor carpi ulnaris

A

Extension and adduction of wrist

23
Q

Innervation of extensor carpi ulnaris

A

Radial nerve (deep branch)

24
Q

Origin and attachment of anconeus

A

Originates from lateral epicondyle

Attaches to olecranon

25
Q

Action of anconeus

A

Extends and stabilises elbow joint

Abducts the ulna during pronation of the arm

26
Q

Innervation of anconeus

A

Radial nerve

27
Q

How many muscles are in the deep compartment of the posterior forearm

A

5

28
Q

With the exception of the supinator, the deep muscles in the posterior forearm act on …

A

Thumb and index finger

29
Q

The deep branch of the radial nerve passes between the two heads of which muscle

A

Supinator

30
Q

Origin and attachment of the supinator

A

One head originates from lateral epicondyle and the other from the posterior surface of the ulna
Attaches to the posterior surface of the radius

31
Q

Actions of supinator

A

Supinates the forearm

32
Q

Innervation of supinator

A

Radial nerve

33
Q

Origin and attachment of abductor pollicis longus

A

Originates from the interosseous and adjacent surfaces of the radius and ulna
Attaches to the lateral side of the base of metacarpal I

34
Q

Action of abductor pollicis longus

A

Abducts the thumb

35
Q

Innervation of abductor pollicis longus

A

Radial nerve (posterior interosseous branch)

36
Q

Origin and attachment of extensor pollicis brevis

A

Originates from posterior surface of the radius and interosseous membrane
Attaches to proximal phalanx of the thumb

37
Q

Action of extensor pollicis brevis

A

Extends at metacarpophalangeal joints and carpometacarpal joints of the thumb

38
Q

Innervation of extensor pollicis brevis

A

Radial nerve (posterior interosseous branch)

39
Q

Origin and attachments of extensor pollicis longus

A

Originates from posterior surface of ulna and interosseous membrane
Attaches to the distal phalanx of the thumb

40
Q

Action of extensor pollicis longus

A

Extends all joints of the thumb

41
Q

Innervation of extensor pollicis longus

A

Radial nerve (posterior interosseous branch)

42
Q

Origin and attachments of extensor indicis proprius

A

Originates from the posterior surface of the ulna and interosseous membrane
Attaches to the extensor hood of the index finger

43
Q

Action of extensor indicis proprius

A

Extends the index finger

44
Q

Innervation of extensor indicis proprius

A

Radial nerve (posterior interosseous branch)

45
Q

… is a thick strip of connective tissue which forms the roof of the carpal tunnel

A

Flexor retinaculum

46
Q

Attachments of flexor retinaculum

A

Medially- Pisiform and hook of hamate

Laterally- Trapezium and scaphoid

47
Q

… is a thickening of the fascia on the dorsum of the hand keeps the extensor tendons in position

A

Extensor retinaculum

48
Q

The radial and ulnar arteries are formed by bifurcation of the … within the cubital fossa

A

Brachial artery

49
Q

Radial artery supplies the … aspect of the forearm

A

Posterolateral

50
Q

Ulnar artery supplies the … aspect of the forearm

A

Anteromedial

51
Q

Radial and ulnar arteries anastomose in the hand forming two arches which are …

A

Superificial palmar arch

Deep palmar arch

Anatomy (11 decks)

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