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Anatomy Exam 3 (JO) > Module 10 > Flashcards

Module 10 Flashcards

1
Q

True or False: The movements that are possible at the radiocarpal joint include: flexion/extension; radial and ulnar deviation; and circumduction.

A

True

Explanation
This statement is true; the radiocarpal joint allows two degrees of freedom (flexion/extension and radial and ulnar deviation) and circumduction.

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2
Q

Which of the following movements is possible at the carpometacarpal (CM) joint of the thumb? Select all that apply.
-radial and ulnar deviation
-opposition and reposition
-flexion and extension
-abduction and adduction
-internal and external rotation

A

-opposition and reposition
-flexion and extension
-abduction and adduction

Explanation
The CM joint of the thumb allows for degrees of freedom: flexion/extension; abduction/ adduction, and opposition/ reposition.

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3
Q

Which of the following ligaments provides support to the distal radioulnar joint?
Palmar radio-ulnar ligaments
Radial Collateral ligament
Dorsal Radio Carpal ligaments

A

Palmar radio-ulnar ligaments

Explanation:
The palmer and dorsal radio-ulnar ligaments provide support to the distal radioulnar joint.

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4
Q

Which of the following ligaments prevents excessive radial deviation?
Radial Collateral Ligament
Ulnar Collateral Ligament
Palmer radiocarpal Ligament

A

Ulnar Collateral Ligament

Explanation:
The ulnar collateral ligament (located on the medial aspect of the wrist) prevents excessive radial deviation.
The radial collateral ligament (located on the lateral aspect of the wrist) prevents excessive ulnar deviation.
The palmar radiocarpal ligament will prevent excessive wrist extension.

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5
Q

Which of the following ligaments will prevent excessive wrist extension? Select all that apply.
Ulnar Collateral
Dorsal Radiocarpal
Palmar Radiocarpal
Dorsal Ulnocarpal
Palmer Ulnocarpal

A

Palmar Radiocarpal
Palmer Ulnocarpal

Explanation:
The palmar radiocarpal and ulnocarpal ligaments will prevent excessive wrist extension. The dorsal radiocarpal and ulnocarpal ligaments will prevent excessive wrist flexion.

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6
Q

Which tendons form the anterior border of the anatomical snuff box? Select all that apply.
Abductor pollicis longus
Extensor pollicis longus
Extensor pollicis brevis
Extensor Digitorium
Extensor Indicis

A

Abductor Pollicis Longus
Extensor Pollicis Brevis

Explanation:
The anterior border of the anatomical snuff box is formed by the tendons of the abductor pollicis longus and extensor pollicis brevis. The posterior border is formed by the extensor pollicis longus.

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7
Q

Which of the following muscles has an origin point from the lateral epicondyle of the humerus? Select all that apply.
Extensor Carpi Radialis Longus
Extensor Carpi Radialis brevis
Extensor Digiti Minimi
Abductor Pollicis Longus
Extensor Digitorium

A

Extensor Carpi Radialis brevis
Extensor Digiti Minimi
Extensor Digitorum

Explanation:
The following superficial muscles all have an origin point from the lateral epicondyle of the humerus: extensor carpi radialis brevis. Extensor digitorum, extensor digit minimi, extensor carpi ulnaris. In addition, one of the deep muscles, the supinator, will also have an origin point from the lateral epicondyle (plus the supinator ridge).

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8
Q

Which of the following will extend and radial deviate the wrist joint?
Supinator
Brachioradialis
Extensor Carpi Ulnaris
Extensor Carpi Radialis Longus

A

Extensor Carpi Radialis Longus

Explanation:
The extensor carpi radialis longus will extend and radial deviate the wrist joint. Supinator will supinate the forearm; brachiradialis is a special muscle of the posterior compartment of the forearm because it shares innervation (radial nerve)with the posterior compartment muscles, but it acts similar to the muscles of the anterior compartment of the arm by flexing the elbow; extensor carpi ulnaris extends and ulnarly deviates the wrist joint.

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9
Q

Which of the following muscles inserts into the extensor expansion of the 2nd digit (index finger)?
Extensor Indicis
Extensor Digitrium
Extensor Digiti Minimi
Extensor Pollicis Longus

A

Extensor Indicis

Explanation:
Extensor Indicis inserts into the extensor expansion of the index finger; digitorium inserts into the extensor expansions of the medial four digits; extensor digit minimi inserts the extensor expansion of the 5th digit (pinky); the thumb muscles don’t insert into an extensor expansion.

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10
Q

Which of the following muscles is a muscle of the deep layer of the forearm? Select all that apply.
Extensor Carpi Radialis Longus
Abductor Pollicis Longus
Extensor Pollicis Brevis
Extensor Pollicis Longus
Extensor Carpi Ulnaris

A

Abductor Pollicis Longus
Extensor Pollicis Brevis
Extensor Pollicis Longus

Explanation
The muscles of the deep layer of the forearm include the: supinator, abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus and the extensor indicis. The extensor carpi radialis longus and extensor carpi ulnaris are muscles of the superficial layer.

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11
Q

Which of the following muscles inserts onto the base of the first metacarpal bone?
Abductor Pollicis Longus
Extensor Pollicis Brevis
Extensor Pollicis Brevis

A

Abductor Pollicis Longus

Explanation:
The abductor pollicis longus inserts at the base of the first metacarpal bone; the extensor pollicis brevis inserts at the base of the distal phalanx of the thumb.

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12
Q

Which of the following tendons is contained in the 3rd dorsal compartment?
Extensor Pollicis Brevis
Extensor Digiti Minimi
Extensor Pollicis Longus

A

Extensor Pollicis Longus

Explanation:
Extensor pollicis longus is contained in the 3rd dorsal compartment; extensor pollicis brevis is contained in the 1st dorsal compartment along with the tendon of abductor pollicis longus; the tendon of extensor digiti minimi is contained in the 5th dorsal compartment.

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13
Q

Which compartment contains the tendons of the extensor digitorium and extensor indicis?
2nd
4th
6th

A

4th

Explanation:
The 4th dorsal compartment contains the tendons of extensor digitorium and indicis; the 2nd dorsal compartment contains the tendons of the extensor carpi radialis muscles (longus & brevis); the 6th dorsal compartment contains the tendon of the extensor carpi ulnaris.

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14
Q

Which of the following muscles forms part of the lateral boundary of the radial tunnel? Select all that apply.
Brachioradialis
Biceps
Extensor Carpi Radialis Longus
Supinator
Extensor Carpi Radialis Brevis

A

Brachioradialis
Extensor Carpi Radialis Longus
Extensor Carpi Radialis Brevis

Explanation:
The lateral boundary of the radial tunnel is formed by three muscles at their respective origins: brachioradialis, extensor carpi radialis longus, & extensor carpi radialis brevis; the biceps and brachialis forms the medial boundary; the superficial layer of the supinator and the radial recurrent vessels form the roof and the deep layer of the supinator and the joint capsule of the humero-radial joint forms the floor of the tunnel.

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15
Q

True or False: The radial nerve will divide into a superficial and deep branch at the level of the cubital fossa.

A

True

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16
Q

The deep branch of the radial nerve supplies which of the following muscles? Select all that apply.
Brachioradialis
Supinator muscle
Extensor carpi radialis longus
Extensor carpi radialis brevis
Extensor carpi ulnaris

A

Supinator Muscle
Extensor carpi radialis brevis

Explanation:
The deep branch of the radial nerve will supply the supinator and the extensor carpi radialis brevis and then continue as the posterior interosseous nerve (PIN). The brachioradialis and the extensor carpi radialis longus are supplied by the radial nerve (proper) and extensor carpi ulnaris is supplies by the PIN.

17
Q

Which of the following muscles is supplied by the PIN? Select all that apply.
Extensor Pollicis Longus
Extensor Digitorium
Extensor Digiti Minimi
Extensor Indicis
Abductor Pollicis Longus

A

Extensor Pollicis Longus
Extensor Digitorium
Extensor Digiti Minimi
Extensor Indicis
Abductor Pollicis Longus

Explanation:
All if the above muscles are supplied by the PIN. In fact, the majority of the muscles of the posterior compartment of the forearm are supplied by the PIN. Exceptions to this rule are: brachioradialis and ECRL (innervated by the radial nerve proper) and ECRB and the supinator (innervated by the deep branch of the radial nerve).

18
Q

True or False: The superficial branch of the radial nerve is a mixed motor and sensory nerve.

A

False

Explanation:
The superficial branch of the radial nerve is a purely cutaneous nerve which supplies the skin over the dorsolateral aspect of the hand.

19
Q

Which of the following nerve supplies the skin of the posterolateral aspects of the forearm?
Medial Antebrachial Cutaneous nerve
Lateral Antebrachial Cutaneous nerve
Posterior Antebrachial Cutaneous nerve

A

Lateral Antebrachial Cutaneous nerve

Explanation:
The skin of the posterolateral aspects of the forearm is supplied by the lateral antebrachial cutaneous nerve (continuation of the musculocutaneous nerve). The skin of the posteromedial aspects of the forearm is supplied by the medial antebrachial cutaneous nerve (branch of the medial cord of the plexus), and the skin along the midline is supplied by the posterior antebrachial cutaneous nerve (branch of the radial nerve).

20
Q

True or False: The posterior interosseous artery is a branch of the radial artery.

A

False

Explanation:
The posterior interosseous artery is a branch of the common interosseous artery (branch of the ulnar artery).

21
Q

Which of the following muscles receives its blood supply from the radial recurrent artery? Select all that apply.
Brachioradialis
Extensor Carpi Radialis Longus
Extensor Digiti Minimi
Extensor Pollicis Longus
Extensor Carpi Radialis Brevis

A

Brachioradialis
Extensor Carpi Radialis Longus
Extensor Carpi Radialis Brevis

Explanation:
The brachioradialis, ECRL, ECRB and the supinator (plus posterior interosseous artery) will receive their blood supply from the radial recurrent artery. All of the rest of the muscles of the posterior compartment will receive their blood supply from the posterior interosseous artery.

22
Q

Where does the PIN begin?
Cubital Tunnel
Prior to entering the supinator muscle
After exiting the supinator muscle
Carpal Tunnel

A

After exiting the supinator muscle

23
Q

What ligament holds the head of the radius onto the radial notch of the ulna?
Radial Collateral Ligament
Ulnar Collateral Ligament
Annular Ligament

A

Annular Ligament

24
Q

What tendon inserts on the base of the 5th metacarpal (palmer side).
ECRL
FCR
ECU
FCU

A

FCU

25
Q

What muscle originates on the lateral supracondylar ridge?
Biceps
Pronater Teres
ECRL

A

ECRL

26
Q

What is the best location to take the radial pulse?
Directly over the radial styloid
Between the flexor carpi radialis and the abductor pollicis longus at the level of the wrist
Between the flexor carpi ulnaris and the palmaris longus at the level of the wrist
Distal to the pisiform

A

Between the flexor carpi radialis and the abductor pollicis longus at the level of the wrist

27
Q

What articulates to form the radial carpal joint
Distal radius and proximal carpal row
Distal radius and distal carpal row
Proximal carpal row and distal carpal row
Ulnar head and proximal carpal row

A

Distal radius and proximal carpal row

28
Q

What type of synovial joint is the distal radial ulnar joint?
Plane/ Irregular
Hinge
Pivot

A

Pivot

29
Q

What are the boundaries of the cubital fossa?
Medial and lateral epicondyle
Medial epicondyle and the brachioradialis
Brachioradialis and pronator teres

A

Brachioradialis and pronator teres

Anatomy Exam 3 (JO) (7 decks)

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