Humerus

Question 1

Head

Answer 1

hemisphere on the proximal end of the humerus that faces medially and articulates with the glenoid fossa of the scapula

Question 2

Anatomical neck

Answer 2

the groove that encircles the articular surface of the head for the attachment of the joint capsule

Question 3

Surgical neck

Answer 3

the short segment inferior to the head. It links the head and shaft.

Question 4

Lesser tubercle

Answer 4

Small, blunt eminence anterolateral to the head on the proximal shaft.

Question 5

Greater tubercle

Answer 5

Larger, more posterior and projects more laterally than the lesser tubercle

Question 6

Intertubercular sulcus (bicipital groove)

Answer 6

extends longitudinally down the proximal shaft

In between the tubercle crests

Question 7

Crest of the greater tubercle

Answer 7

forms the lateral lip of the intertubercular groove

Question 8

Crest of the lesser tubercle

Answer 8

forms the medial lip of the intertubercular groove

Question 9

Shaft

Answer 9

variably triangular, ranging from more cylindrical in its proximal section to an anteroposteriorly compressed, rounded triangle distally

Question 10

Deltoid tuberosity

Answer 10

On the lateral surface of the shaft. Insertion site of the deltoideus muscle

Question 11

Radial sulcus (spiral groove)

Answer 11

found on the posterior surface of the shaft. Shallow, oblique groove for the radial nerve and deep vessels that pass parallel and immediately posteroinferior to the deltoid tuberosity

Question 12

Nutrient foramen

Answer 12

located anteromedially and exits the shaft from distal to proximal

Question 13

Olcranon fossa

Answer 13

largest of three hollows on the distal humerus. Accommodating the ulna during forearm extension

Question 14

Coronoid fossa

Answer 14

the larger medially placed hollow on the anterior surface of the distal humerus

Question 15

Radial fossa

Answer 15

the smaller, laterally placed hollow on the anterior surface of the distal humerus

Question 16

Capitulum

Answer 16

rounded eminence that forms the lateral portion of the distal humeral surface. It articulates with the head of the radius.

Question 17

Trochlea

Answer 17

the notch or spool shaped medial portion of the distal humeral surface. It articulates with the ulna.

Question 18

Lateral epicondyle

Answer 18

small, nonarticular lateral bulge of bone super-lateral to the capitulum

Question 19

Medial epicondyle

Answer 19

nonarticular, medial projection of bone superomedial to the trochlea. It is more prominent than the lateral epicondyle.

Question 20

Medial supracondylar crest (ridge)

Answer 20

superior to the medial epicondyle and forms the sharp medial boarder fo the distal humerus

Question 21

Lateral supracondylar crest (ridge)

Answer 21

superior to the lateral epicondyle and forms the sharp lateral boarder of the distal humerus

Question 22

Siding intact bone: Head

Answer 22

head faces medially

Question 23

Siding intact bone: Capitulum

Answer 23

faces lateral

Question 24

Siding intact bone: olecronan fossa

Answer 24

faces posterior

Question 25

Siding isolated proximal end:

Answer 25

head medial, lesser tubercle and intertubercular groove are anterior

Question 26

Siding isolated distal end

Answer 26

olecranon fossa is posterior, medial epicondyle is larger, and the capitulum is lateral and orientated anteriorly

Question 27

Siding isolated distal end if articular end missing

Answer 27

Coronoid fossa is larger and more medial than the radial fossa

Question 28

Siding isolated shaft fragment

Answer 28

deltoid tuberosity is lateral with its posterior arm passing from posterosuperior to anteroinferior and the nutrient foramen exits the bone toward the proximal end
A small thin ridge runs along the entire medial edge of the shaft and the nutrient foramen is found on this edge
The lateral lip of the intertubercular groove is stronger and longer