Human Anatomy Vol 1

UPPER LIMB

Table 2

Name of bone and pafts Primary centre Secondary centres

Humerus

. Shaft
. Upper end
Head
Greater tubercle
Lesser tubercle
. Lower end
Capitulum + lateral
part of trochlea
Medial part of trochlea
Lateral epicondyle
. Medial epicondyle
Radius
. Shaft
. Lower end
. Upper end

8 wk IUL

(intrauterine life)

8 wk IUL

1st yr

2nd yr

5th yr

6th yr

14th yr

20th yr

16th yr

20th yr

20th yr

18th yr

1st yr

4th year

Ulna

. Shaft
. Lower end
.-{,lpper end

Sfi

It has three borders and

8 wk IUL

Occlusion

of brachial

Axillory Artery

Figs 2,18a and b: (a) Supracondylar fracture of humerus,

and (b) Volkmann's ischaemic contracture

18th yr

16th yr

Ba rs

L The anterior border extends from the anterior margin

of the radial tuberosity to the styloid process. It is

oblique in the upper half of the shaft, and vertical in

the lower half. The oblique part is called the anterior

oblique line. The lower vertical part is crest-like

(Fig.2.2L).

2 The posterior border is the mirror image of the anterior

border, but is clearly defined only in its middle one-

third. The upper oblique part is known as the

posterior oblique lines (Fig. 2.21).

3 The medial or interosseous border is the sharpest of the

three borders. It extends from the radial tuberosity

above to the posterior margin of the ulnar notch

below. The interosseous membrane is attached to its

lower three-fourths. In its lower part, It forms the

posterior margin of an elongated triangular area.

$u ce$

L The anterior surface lies between the anterior and

interosseous borders. A nutrient foramen opens in

its upper part, and is directed upwards. The nutrient

artery is a branch of the anterior interosseous artery

(Fig.2.23).

5th yr

1Oth yr

lt
.E

oCL
CL
f

E

.g

oo

U)

Time of fusion together Time of fusion

with shaft

three surfaces (Fig. 2.22).