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Anatomy of the upper limb > Extensor (posterior) compartment of the forearm > Flashcards

Extensor (posterior) compartment of the forearm Flashcards

1
Q

What are the 5 superficial extensors that originate from the lateral epicondyle?

A
  • Extensor Carpi Radialis Longus
  • Extensor Carpi Radialis brevis
  • Extensor Digitorum (communis)
  • Extensor digiti minimi
  • Extensor Carpi Ulnaris
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2
Q

Which 3 muscles are wrist extendors?

A
  • Extensor Carpi radialis longus
  • Extensor Carpi Radialis Brevis
  • Extensor Carpi Ulnaris
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3
Q

What is the origin and insertion of extensor carpi radialis LONGUS?

A

ORIGIN : Lateral epicondyle (of humerus)

INSERTION : 2nd metacarpal

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4
Q

What is the innervation of extensor carpi radialis LONGUS?

A

Radial nerve (C6, C7) , (before division into superficial and deep branches)

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5
Q

What is the function of Extensor carpi radialis longus?

A

Extends and Abducts the wrist

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6
Q

What is the origin and insertion of Extensor Carpi Radialis Brevis?

A

ORIGIN : Lateral EPICONDYLE of humerus

INSERTION : base of metacarpal 2 and 3

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7
Q

What is the innervation of Extensor Carpi Radialis Brevis?

A

Deep branch of RADIAL nerve (C7, C8)

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8
Q

what is the function of extensor carpi Radialis brevis?

A

extends and abducts wrist

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9
Q

what is the origin and insertion of extensor digitorum (communis)

A

ORIGIN : Lateral epicondyle of the humerus

INSERTION : 4 tendons insert onto the bases of the middle and distal phalanges of digits 2 - 5

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10
Q

What is the innervation of extensor digitorum ?

A

Posterior Interosseous Nerve ( C7, C8)

*continuation of the deep branch of the Radial Nerve

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11
Q

what is the function of extensor digitorum?

A

extends digits 2 - 5.

Also extends wrist

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12
Q

what is the origin and insertion of Extensor digiti minimi?

A

ORIGIN : Lateral epicondyle of humerus

INSERTION : extensor hood of little finger

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13
Q

What is the innervation of extensor digiti minimi?

A

Posterior interosseous nerve (C7, C8)

*continutation of the deep branch of the radial nerve

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14
Q

What is the origin and insertion on anconeus?

A 
Origin = Lateral Epicondyle
Insertion = Olecranon(ulna) and Proximal prosterior surface of Ulna
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15
Q

What is the nerve supply of anconeus?

A

Radial Nerve (C7, C8 and T1)

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16
Q

What is the fucntion of anconeus?

A
  • abduction of Ulna in pronation

- accessory extensor of elbow joint

17
Q

what is the function of extensor digiti minimi?

A

extend little finger

18
Q

what is the origin and insertion of Extensor Carpi Ulnaris?

A 
Origin = Lateral Epicondyle of humerus
Insertion = Tubercle on base of medial side of metacarpal 5
19
Q

What is the innervation of extensor carpi ulnaris?

A

Posterior interosseous nerve (C7, C8)

20
Q

What is the function of extensor carpi ulnaris?

A

extends and ADDucts wrist

21
Q

What are the 5 deep muscles of the posterior (extensor) compartment of the forearm?

A
  • Supinator
  • Abductor Pollicis Longus
  • Extensor Pollicis Brevis
  • Extensor Pollicis Longus
  • Extensor Indices
22
Q

What is the origin, insertion and function of Supinator muscle?

A 
ORIGIN :
Superficial head = 
-Lateral Epicondyle of humerus, 
-radial collateral 
-and ulnar ligaments.

Deep Head =
-Supinator crest of ulna

INSERTION :
Lateral surface of radius (superior to anterior oblique line)

FUNCTION :
Supination

23
Q

What is the innervation of Supinator?

A

Posterior Interosseous Nerve ( C6, C7)

24
Q

What is the origin and insertion of Abductor Pollicis Longus?

A

ORIGIN : Posterior surface of ULNA and RADIUS + Interosseous membrane.

INSERTION : Lateral side of base of metacarpal 1 (thumb)

25
Q

What is the innervation of Abductor Pollicis Longus?

A

Posterior Interosseous Nerve (C7, C8)

26
Q

What is the function of abductor pollicis longus?

A

Abducts thumb

accessory extendor of thumb

27
Q

What is the origin and insertion of extensor pollicis brevis?

A

ORIGIN :
Posterior surface of RADIUS (+ interosseous membrane)

INSERTION :
base of PROXIMAL phalanx of thumb (dorsal side)

28
Q

What is the innervation and function of extensor pollicis brevis?

A

nerve : POSTERIOR INTEROSSEOUS (C7, C8)

function : extends thumb

29
Q

What is the origin and insertion of extensor pollicis longus?

A

ORIGIN : Posterior surface of ULNA and (interosseous membrane)

INSERTION : base of distal phalanx of thumb (dorsal surface)

30
Q

What is innervation and function of extensor pollicis longus?

A

Innervation : POSTERIOR INTEROSSEOUS (C7, C8)

Function : extends thumb

31
Q

What is origin and insertion of Extensor Indices?

A

ORIGIN :
Posterior surface of Ulna + interosseous membrane

INSERTION :
Extensor hood of index finger

32
Q

What is the innervation and function of Extensor Indices?

A

Innervation : Posterior Interosseous Nerve (C7, C8)

Function : Extension of index finger

33
Q

What 3 tendons form the boundaries of the anatomical snuff box?

A 
superior = Extensor pollicis longus
Inferior = Extensor pollicis brevis and Abductor pollicis longus
34
Q

What are the contents of the anatomical snuff box?

A
  • Radial artery

- Cephalic Vein

35
Q

What bony elements can be palpated in the floor of the snuffbox?

A

Scaphoid and Trapezium

Anatomy of the upper limb (18 decks)

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