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Human Anatomy (DO 1) > Lab 7: Posterior Forearm and Dorsal Hand > Flashcards

Lab 7: Posterior Forearm and Dorsal Hand Flashcards

1
Q

Dorsal Venous Arch

A

Origin of the cephalic and basilic veins

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2
Q

Extensor Retinaculum

A

Thickening of the antebrachial fascia in the wrist region

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3
Q

Identify the six superficial muscles of the posterior forearm

A 
Brachioradialis 
Extensor carpi radialis longus 
Extensor carpi radialis brevis 
extensor digitorium 
extensor minimi 
extensor carpi ulnaris
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4
Q

Which superficial posterior muscles of the forearm share the common extensor tendon

A

Extensor carpi radialis brevis
Extensir digitorium
Extensor digiti minimi
Extensor Carpi Ulnaris

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5
Q

Common extensor tendon (location and clinical relevance)

A

Located on the lateral epicondyle

Irritation (lateral epicondytis) = Tennis Elbow

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6
Q

Which superficial posterior forearm muscle is most often involved in tennis elbow

A

ECRB

Extensor carpi radialis brevis

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7
Q

Identify the five deep muscles of the posterior forearm

A 
Supinator 
Abductor Pollicis Longus 
Extensor Pollicis brevis 
Extensor Pollicis Longus 
Extensor Indicis
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8
Q

Supinator Origin and Insertion

A

Origin: Ulnar (superior to abductor pollicis longus)
Insertion: Radial ( Superior to pronator teres)

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9
Q

Order of attachment (proximal to distal) of deep muscles of posterior forearm on the ulna

A
  • Supinator
  • APL (Abductor Pollicis Longus)
  • EPL (Extensor Pollicis Longus)
  • EI (Extensor Indicis)
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10
Q

Which of the deep muscles of the posterior forearm does not contact the ulna

A
  • EPB (Extensor Pollicis Brevis)
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11
Q

Nerve that comes through the Supinator

A
  • Deep Radial nerve enters the supinator, as it exits it is named the posterior interosseous nerve
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12
Q

Posterior Interosseous nerve

A

Continuation of Deep Radial Nerve
Emerges from Supinator
Runs along pollicis muscles
Travels with Posterior Interosseous Artery

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13
Q

Anterior Border of anatomical snuff box

A

Tendon of the extensor pollicis brevis

Indirect:
Tendon of abductor pollicis longus

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14
Q

Posterior Border of anatomical snuff box

A

Tendon of the extensor Pollisis Longus

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15
Q

Describe the course of neurovasculature in/around the anatomical snuff box

A

Radial Artery runs through the snuff box
Cephalic vein courses over the top
** think about anatomical position (Cephalic closer to
head)

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16
Q

What forms the floor of the snuff box?

A

Scaphoid Bone
Trapezium
1st Metacarpal

17
Q

Dorsal Interossei muscles

A

“DAB”

  • 4 muscles that act on 3 fingers to ABduct them away from finger 3 (midline)
  • Feather/Leaf appearance
18
Q

First Dorsal Interossei Muscle

A

From Metacarpal 1 to Metacarpal 2

Connects to radial side of 2 @ extensor expansion

19
Q

Second Dorsal Interossei Muscle

A

From Metacarpal 2 to 3

Connects radial side of 3 @ extensor expansion

20
Q

Third Dorsal Interossei Muscle

A

From Metacarpal 3 to 4

Connects ulnar side of 4 @ extensor Expansion

21
Q

Fourth Dorsal Interossei Muscle

A

From Metacarpal 4 to 5

Connects ulnar side of 5 @ extensor expansion

22
Q

Course of the extensor expansion and impact of joint movement

A

On palmar side of MP joint (Flexion)
On Dorsal Side of PIP and DIP joints (Extension)

***All about how it crosses the joint

23
Q

Tendons of extensor digitorum

A

Extensor digitor gives off 4 tendons that are covered by the exensor expansion (hood) as of comes up from the palmar side

Metacarpals 2-5 (NOTE: No thumb)

Action: extends the wrist and all four fingers

24
Q

Extensor Expansion (most distal)

A

Present on dorsum of digits 2-5

Distal attachment of lumbercals and interossi muscles

25
Q

Action of the exetnsor expansion

A

Simultaneously flex the metacarpophalangeal joints

*** think about how it crosses these joints

26
Q

Attachment of Extensor carpi radialis longs

A

base of metacarpal 1

27
Q

Attachment of Extensor carbi radialis brevis

A

base of metacarpal 2

28
Q

Attachment of Extensor carpi ularis

A

base of metacarpal 5

29
Q

Name the extensor carpi muscles (in order from superior to inferior - anatomical position)

A

Extensor carpi radialis longus (2)
Extensor carpi radialis brevis (3)
Extensor carpi ulnaris (5)

Human Anatomy (DO 1) (13 decks)

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