Book One -- The things that sustain and support the entire body, and what braces and attaches them all. [the bones and the ligaments that interconnect them] | Chapter 23 On the Humerus or Arm Bone

Index of Characters in the Two Figures of the Present Chapter

A, B, C, D, E, F, G, H Some of these letters are to be found in the first figure, others in the second, indicating the epiphysis 1 of the humerus which is quite complexly shaped, as I shall show.
A, B, C[ 1 , 2 ] In both figures these letters circumscribe the head of the humerus [caput humeri] which is articulated into the scapula.
D, E[ 1 , 2 ] Both letters are seen in the first figure, marking the outer head [tuberculum minus (D), tuberculum majus (E)] of the epiphysis of the humerus,


page 104

into which the ligaments of the joint [articulatio glenohumeralis] are inserted. D marks the anterior [facies anterior] head of this outer head, E the posterior [facies posterior], which is more visible in the second figure than in the first.
F, G[ 1 , 2 ] These two letters in the first figure, and G in the second, mark the broad depression [collum anatomicum] that separates the inner head from the outer. We shall add the rest of the index beneath the figures to be placed here. 2


First figure of the twenty-third chapter, showing the anterior face of the right humerus.


Second figure of this chapter, setting forth the posterior face of the right humerus.

H, I 1 Depression [sulcus intertubercularis] dividing the outer head in two, provided for the outer head of the anterior of the muscles [m. biceps brachii, caput longum] that flex the forearm.
K, L, M 1 , 2 Trochlea 3 [condylus humeri, trochlea humeri] of the humerus, against which the ulna is flexed and extended; K marks the depression [sulcus] of the trochlea, L and M the sides: L the internal side, M the external.
N 1 Depression [fossa coronoidea] incised at the upper part of the trochlea in the anterior surface of the humerus.
O 2 Depression [fossa olecrani] quite deeply hollowed out at the upper part of the trochlea, in the posterior side of the humerus.
P 1 , 2 Head or tuberculum [condylus humeri, capitulum humeri] of the humerus to which the radius is articulated. In the first figure of this chapter the part appears which is covered with cartilage. In the second, that part [epicondylus lateralis] appears to which the radius is not joined, but which serves elegantly for the origin of muscles. 4
Q 1 , 2 Here [crista supracondylaris lateralis] the humerus protrudes for a great extent of its length like a sharp line. 5
R 2 Depression [sulcus] in this outer head [epicondylus lateralis] of the humerus, carved out for the fourth of the nerves 6 going to the arm.
S 1 , 2 Inner tubercle [epicondylus medialis] of the humerus. 7
T 1 Depression in the anterior of the tuberculum, provided for the third of the nerves going to the arm.
V 2 Depression [sulculus nervi ulnaris] in the interior tuberculum, in which the fifth nerve [n. ulnaris] to the arm is carried.
X, Y, Z 2 Posterior area [facies posterior] of the humerus. X marks the superior portion, which is concave; Z marks the inferior part, which is convex; Y marks the impressed place [sulcus nervi radialis] on which the fourth of the nerves [n.radialis] to the arm is turned.
a, b, c, d 1 Anterior area of the humerus, where b [margo anterior] identifies its prominent or convex part, a [facies anterior lateralis] and c [facies anterior medialis] the place where the bone is depressed on each side near this protuberance. These three letters together mark the concave lower part of the anterior side of the humerus; d [crista tuberculi minoris] marks the upper area, which is convex.
e 1 , 2 Roughness [tuberositas deltoidea] located next to the outer side of the anterior part of the humerus. 8
f 1 Roughness [crista tuberculi majoris] visible in the anterior part of the humerus, at the root of the depression [I] that brings out the outer head of the muscle [ m. biceps brachii, caput longum] which is considered the anterior of those that flex the forearm. 9



Book One -- The things that sustain and support the entire body, and what braces and attaches them all. [the bones and the ligaments that interconnect them] | Chapter 23 On the Humerus or Arm Bone