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Anatomy Exam 2 > Extensors > Flashcards

Extensors Flashcards

1
Q

True of false: The Abductor Pollicus Longus extends the thumb at the interphallengial joint

A

False: It cannot help at the IP joint because it attaches at the base of the 1st metacarpal (thumb)

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1
Q

Your patient is unable to extend their IP joint at the thumb, what tendon is most likely injured?

A

The Extensor Pollicis LONGUS tendon

(It’s the only tendon to pass over the IP joint at the thumb, Brevis does not)

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2
Q

Which tendon compartment moves places depending on where you take a cross section of the wrist?

A

Synovial Sheath 3 (with extensor pollicis longus)

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3
Q

De Quervian’s Tenosynovitis is also called ______ and is caused by ______

It is common in who?

A

“Texting thumb”

Cumulative Trauma disorder of tendons in 1st dorsal compartment.

Common in new mothers.

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4
Q

When you have a spinal cord injury at what level, are you limited to only being able to extend the wrist?

A

An injury between C7 and C8 (C7 spinal nerve injury)

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5
Q

Distal radius fracture: A volar displacement of bone is called what?

A

A smith fracture

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6
Q

Distal radius fracture: What is Dorsal displacement of the bone called?

A

Colles’ fracture

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7
Q

What is the name of bone 1 and 2?

A
  1. Pisiform
  2. Triquetrum
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8
Q

What is the name of bone 3 and 4?

A
  1. Lunate
  2. Scaphoid
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9
Q

What is the name of bone 5 and 6?

A
  1. Trapezium
  2. Trapezoid
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10
Q

What is the name of bone 7 and 8?

A
  1. Capitate
  2. Hamate
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11
Q

The mid-carpal joint classifies as a ______ joint

A

ellipsoid joint and functions “Bi-axial”

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12
Q

True or false: : The mid-carpal joint does: flexion, extension, radial
deviation, ulnar deviation,** and
circumduction **

A

True, it circumducts with the radiocarpal jt

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13
Q

What are the two ligaments of the Distal Radioulnar joint?

A

Volar radioulnar ligaments

Dorsal radioulnar ligaments

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14
Q

What carpal joints help with Radius/ulnar deviation?

A

Radiocarpal Joint and Midcarpal Joint

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15
Q

Name the 3 parts of a Metacarpal and a Phalange

A
  1. Base
  2. Shaft
  3. Head
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16
Q

There are ___ Metacarpals and ___ phalanges?

A

5 Metacarpals

14 Phalanges

17
Q

Name structure 1 and 2

A
  1. Dorsal Radio-ulnar ligament
  2. Triangular fibrocartilage complex (TFCC)
18
Q

Carpometacarpal Joints of the Fingers do what action?

A

Volar and Dorsal gliding

19
Q

Extrinsic muscles of the hand can ______ whereas instrinsic muscles are for ______

A

Extrinsic: Generate greater force

Intrinsic: For precise control

20
Q

Name these 2 muscles

Which one is more lateral?

Which one is more superficial?

A

Left: Extensor Carpi Radialis Longus

Right: Extensor Carpi Radialis Brevis

Longus is more lateral and superficial

21
Q

What two muscles are involved in tennis elbow?

A

Extensor Carpi Radialis Longus and Brevis

22
Q

What are the muscle actions of Extensor Carpi Radialis Longus and Brevis

A

Extend the wrist

Radial Deviation

Longus is active during fist clenching aswell

23
Q

What is the proximal attachment of Extensor Carpi Radialis Longus?

What about for Brevis?

A

Longus: Lateral supra-epicondylar ridge of humerus

Brevis- Common extensor tendon to the Lateral Epicondyle of Humerus

24
Q

What is the distal attachment of Extensor Carpi Radialis Longus

A

base of the 2nd metacarpal

25
Q

What is the distal attachment of Extensor Carpi Radialis Brevis

A

base of the 3rd metacarpal

26
Q

What is the innervation of all wrist extensor muscles

A

Radial Nerve

27
Q

What is the distal attachment of Extensor Digitorum

A

Extensor expansions of the medial 4 digits.

28
Q

What is the innervation of extensor digitorum?

A

Deep branch of Radial Nerve C7 C8

29
Q

What is the Proximal attachment of Extensor Digitorum?

A

Lateral epicondyle of the humerus
(common extensor tendon)

30
Q

What is the proximal attachment of Extensor Digiti Minimi?

A

Lateral epicondyle of humerus
(common extensor origin)

31
Q

What is the distal attachment of Extensor Digiti Minimi

A

Extensor expansion of 5th digit

32
Q

What is the innervation of extensor digiti minimi?

A

Radial nerve (deep branch) (C7, C8)

33
Q

What are the muscle actions of Extensor Carpi Ulnaris

A

Extend Wrist

Ulnar Deviation

Active during fist clenching

34
Q

What is the distal attachment of the Extensor Carpi Ulnaris

A

Base of the 5th metacarpal

35
Q

What is the innervation of Extensor Carpi Ulnaris

A

Radial Nerve c7 c8

36
Q

What is the distal attachment of Extensor Indicis

A

Extensor expansion of 2nd digit

37
Q

What is the proximal attachment of Extensor Indicis

A

Posterior ulna and interosseous
membrane

38
Q

What is the muscle action of Extensor Indicis

A

Extend the 2nd digit (MCP joint)
May assist to extend the wrist (radiocarpal joint)

39
Q

What is the innervation of Extensor indicis

A

Radial (PIN) C7 and C8

40
Q

What is the most ventral muscle that the Radial nerve innervates?

A

Brachioradialis

41
Q

What 3 muscles are innervated by 2 nerves?

A
  1. Lumbricals of hand
  2. Flexor Pollicus Brevis
  3. Flexor Digitorum Profundus

Anatomy Exam 2 (10 decks)

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