forearm and elbow anatomy

Question 1

name the articulation in the wrist joint ?

Answer 1

Distal radioulnar joint: with the head of the ulna

Question 2

name the two parts of the distal radius ?

Answer 2

-Radial Styloid process: lateral side projects distally

-Ulnar notch: medial surface forms radioulnar joint

Question 3

name the two parts of the distal ulna ?

Answer 3

• Head of Ulna: smaller in diameter,rounded head
• Ulnar styloid process: attached to the ulnar collateral ligament

Question 4

what is longer the ulna or radius ?

Answer 4

ulna

Question 5

what is the medial bone out of the radius and ulna

Answer 5

ulna is the medial bone

Question 6

what is the lateral bone out of the radius and ulna

Answer 6

radius is the lateral bone

Question 7

describe pronation and supination

Answer 7

• pronation is where the palm is facing downwards (posterior)

-supination is when the palm is facing upwards (superior)

Question 8

what are the two articulations for proximal radius ?

Answer 8

-Elbow joint (articulates with humerus)

-Proximal radioulnar joint: radial head & ulnar notch

Question 9

what are the 3 structures for the proximal radius ?

Answer 9

-Head of Radius: disc shaped, concave articulating surface (with radial notch

-Neck: narrow, between head and radial tuberosity

-Radial Tuberosity: projection allows for attachment of the tendons of the biceps brachii muscle

Question 10

name the 4 structures of the proximal ulna ?

Answer 10

-Olecranon process: projection of bone extends proximally forming back of the trochlear notch

-Trochlear notch: Wrench shaped, articulates with trochlea of humerus

-Coronoid process: ridge of bone projects outwards anteriorly forming front part of trochlear notch

-Radial notch: lateral surface of trochlear notch articulates with head of radius

Question 11

what can you not see clearly on a ap elbow ?

Answer 11

trochlea notch

Question 12

name the properties of diatal humerous (7)

Answer 12

-Medial and lateral epicondyles

-Capitulum: rounded, articulates with head of radius (the Malteser)

-Trochlea: pulley shaped, articulates with trochlear notch of the ulna

-Radial fossa – anteriorly, receives head of radius when elbow is flexed

-Coronoid fossa – anteriorly, receives coronoid process of ulna when elbow flexed

-Olecranon fossa – posteriorly, receives olecranon process when elbow is extended

Question 13

what structures are superimposed in the humerus

Answer 13

Capitulum and Trochlea

Question 14

what structues are not visible on a ap elbow

Answer 14

Radial Fossa
Coronoid Fossa

Question 15

what structures are not visible on a lateral elbow

Answer 15

Radial Fossa
Coronoid Fossa
Olecranon Fossa