Anatomy - The Elbow and Wrist

Question 1

What is the spiral groove in the humerus associated with

Answer 1

Radial nerve

Question 2

Why is the medial epicondyle more pronounced

Answer 2

It protects the ulnar nerve.

Question 3

Articulations within joint capsule

Answer 3

Humeroulnar
Humeroradial
Proximal radioulnar

Question 4

What is the humeroulnar joint stabilised by

Answer 4

Olecranon and corocoid processes clamp trochlea of humerus

Question 5

What is the proximal radioulnar joint stabilised by

Answer 5

Notch in proximal ulna the radius sits against

Question 6

Hinge joint in elbow

Answer 6

Trochlear articulates w/ proximal site ulna

Question 7

Pivot joint in elbow

Answer 7

Capitulum articulates with head of radius

Allows pronation and supination

Question 8

Where do they olecranon and coronoid processes its

Answer 8

In their respevctive fossa

Question 9

How do the biceps attach to the radius

Answer 9

Distally at at bicipital tuberosity

Question 10

What does the proximal radio-ulnar joint allow

Answer 10

Head of radius to spin against ulna

Question 11

Why are humeroradial dislocations more common in children

Answer 11

Head of radius is an ossification centre, therefore head of radius smaller in children
But when expected a child will use their muscles to support the joint and prevent dislocation

Question 12

Attachment of MCL of elbow

Answer 12

Attaches to ulna

Question 13

Attachment of LCL of elbow

Answer 13

Attaches to ulna and annular ligament

Question 14

Annular ligament

Answer 14

Attaches ulna to ulna

Holds head of radius against capitulum - prevents slip down forearm

Question 15

What is in between the radius and ulna

Answer 15

Interosseous membrane which helps hold radius and ulnar together

Question 16

Why is the radius more at risk during a FOOSH

Answer 16

Radius is bigger at distal end of arm than proximal end as its articulates w hand

Question 17

Anatomical medial side of hand

Answer 17

Ulnar aspect

Little finger

Question 18

Anatomical lateral side of hand

Answer 18

Radial aspect

Thumb

Question 19

What passes through dorsal tubercle on radius

Answer 19

Extensor Digitorum longus (tendon)

Question 20

Where are styloid processes found

Answer 20

On the side of radius and ulna

Question 21

Condyloid joint

Answer 21

Joint formed between distal end of radius and ulnar with carpal bones
Similar to ball and socket but allows less movement, flexion, extension, adduction and abduction

Question 22

Carpal bones

Answer 22

Scaphoid 
Trapezium 
Trapezoid 
Capitate 
Hamate 
Pisiform 
Triquetral 
Lunate

Question 23

Distal row of carpal bones (thumb to pinky)

Answer 23

Trapezium, trapezoid, capitate, hamate

Question 24

Proximal row of carpal bones (pinky to thumb)

Answer 24

Triquetral, pisiform, lunate, scaphoid

Question 25

Whys is the scaphoid more prone to fracture

Answer 25

Has a narrowing, neck of scaphoid

Question 26

Boundaries of anatomical snuffbox

Answer 26

Extensor policis longus and abductor policis longus

Question 27

Clinical significance of scaphoid fracture

Answer 27

Blood supply via a carpal branch of the radial artery to the distal aspect of the bone
Fracturing the neck will disrupt the blood supply to the proximal aspect —> avascular necrosis

Question 28

Bones more at risk of injury after a FOOSH

Answer 28

Those on radial aspect - scaphoid, lunate, trapezium, trapezoid

Question 29

Naming of metacarpals

Answer 29

1-5, from thumb to pinky

Question 30

Movements at MCP joints in fingers

Answer 30

Flexion, extension, abduction and adduction

Question 31

Movements at interphalangeal joints

Answer 31

Flexion and extension