Humerus and Ulna

Question 1

Humerus

Answer 1

the bone of the upper arm or forelimb, forming joints at the shoulder and the elbow

Question 2

Humerus head

Answer 2

At the shoulder, the head of the humerus articulates with the glenoid fossa of the scapula

Question 3

anatomical neck (humerus)

Answer 3

obliquely directed, forming an obtuse angle with the body of the humerus. in the upper half it is represented by a narrow groove separating the head of the humerus from the two tubercles, affords attachment to the articular capsule of the shoulder-joint

Question 4

greater tubercle

Answer 4

situated lateral to the head of the humerus and posterolateral to the lesser tubercle. Its upper surface is rounded and marked by three flat impressions

Question 5

lesser tubercle

Answer 5

although smaller, is more prominent than the greater tubercle: it is situated in front, and is directed medially and anteriorly

Question 6

intertubercular groove

Answer 6

the deep groove that divides the greater and lesser tubercles

Question 7

deltoid tuberosity

Answer 7

a rough, triangular area on the anterolateral (front-side) surface of the middle of the humerus to which the deltoid muscle attaches

Question 8

lateral epicondyle

Answer 8

a small, tuberculated eminence, curved a little forward, and giving attachment to the radial collateral ligament of the elbow-joint, and to a tendon common to the origin of the supinator and some of the extensor muscles

Question 9

medial epicondyle

Answer 9

gives attachment to the ulnar collateral ligament of elbow joint, to the Pronator teres, and to a common tendon of origin (the common flexor tendon) of some of the Flexor muscles of the forearm

Question 10

sulcus for ulnar nerve

Answer 10

groove for ulnar nerve: a shallow vertical groove on the posterior surface of the medial epicondyle of the humerus for the ulnar nerve; called also ulnar groove

Question 11

capitulum

Answer 11

the small rounded eminence on the lateral half of the distal end of the humerus for articulation with the radius

Question 12

trochlea

Answer 12

the medial portion of the articular surface of the elbow joint which articulates with the trochlear notch on the ulna in the forearm

Question 13

coronoid fossa

Answer 13

a small depression superior to the anterior portion of the trochlea, which receives the coronoid process of the ulna during flexion of the forearm

Question 14

olecranon fossa

Answer 14

a deep triangular depression on the posterior side of the humerus, superior to the trochlea, in which the summit of the olecranon is received during extension of the forearm

Question 15

supra condular ridge

Answer 15

either of two ridges above the condyle of the humerus of which one is situated laterally and the other medially and which give attachment to muscles

Question 16

Ulna

Answer 16

the thinner and longer of the two bones in the human forearm, on the side opposite to the thumb

Question 17

semilunar notch (ulna)

Answer 17

narrow, oblong, articular depression on the lateral side of the coronoid process; it receives the circumferential articular surface of the head of the radius also known as the radial notch.

Question 18

olecranon process

Answer 18

the large process of the ulna that projects behind the elbow, forms the bony prominence of the elbow, and receives the insertion of the triceps muscle

Question 19

coronoid process

Answer 19

a projection from the front of the ulna forming part of the articulation of the elbow

Question 20

ulnar tuberosity

Answer 20

a prominence at the lower border of the anterior surface of the coronoid process, giving attachment (insertion) to the brachialis muscle

Question 21

radial notch

Answer 21

a narrow depression on the lateral side of the coronoid process of the ulna that articulates with the head of the radius and gives attachment to the annular ligament of the radius

Question 22

interosseous (border) crest

Answer 22

begins above by the union of two lines, which converge from the extremities of the radial notch and enclose between them a triangular space for the origin of part of the Supinator; it ends below at the head of the ulna

Question 23

ulna head

Answer 23

see picture

Question 24

styloid process

Answer 24

found at distal end of the forearm, and projects from the medial and back part of the bone; it descends a little lower than the head, and its rounded end affords attachment to the ulnar collateral ligament of the wrist