Human Anatomy Vol 1

UPPER LIMB

Anterior border

Posterior border

Anterior surface

Medial border

Anterior border

Medial

surface

Posterior border

Posterior surface

Fi1.2.23: The radius and ulna in transverse section

For scaphoid

lnferior surface

For lunate

Styloid process

Fi1.2.24:. lnferior surfaces of radius and ulna

2 The posterior surface presents four grooves for the

extensor tendons. The dorsal tubercle of Lister lies

lateral to an oblique groove (Fig.2.22).

3 The medial surface is occupied by the ulnar notchfor

the head of the uJna (Fi9.2.24).

4 The lateral surface is prolonged downwards to form

the styloid (Greek pillar) process (Fig.2.22).

5 The inferior surface bears a triangular area for the

scaphoid bone, and a medial quadrangular area for

the lunate bone. This surface takes part in forming

the wrist loint (Fig.2.24).

Attochmenls

L The biceps (Lattn two heads) brachii is inserted into

the rough posterior part of the radial tuberosity. The

anterior part of the tuberosity is coveredby abursa

(Frgs2.25 and 8.4).

2 The supinator (Latin to bendback) is inserted into the

upper part of the lateral surface (Fig.2.26).

3 The pronator teres is inserted into the middle of the

lateral surface (Fig. 2.25).

4 The brachioradialls is inserted into the lowest part

of the lateral surface just above the styloid Process

(Fig.2.25).

5 The radial head of the flexor digitorum superficialis

takes origin from the anterior oblique line and the

upper part of anterior border (Fig.2.25).

6 Tlre flexor pollicis (Latin thumb) longus takes origin

from the upper two-thirds of the anterior surface

(Fis.2.25).

7 The pronator qundratus is inserted into the lower part

of the anterior surface and into the triangular area

on the medial side of the lower end. The radial artery

is palpated for "radialpulse" as it lies medial to the

sharp anterior border of radius, lateral to the tendon

of flexor carpi radialis (Fig.2.25).

8 The abductor pollicis longus and the extensor pollicis

breois arise from the posterior surface (Fig.2.26).

9 The quadrate ligament is attached to the medial part

of the neck.

L0 The oblique cord is attached on the medial side just

below the radial tuberosity (Fi9.2.25).

11 The articular capsule of the wrist joint is attached to

the anterior and posterior margins of the inferior

articular surface (Figs 2.21, and 2.22).

12 The articular disc of the inferior radioulnar joint is

attached to the lower border of the ulnar notch

(Fis.2.25).

13 The extensor retinaculumis attached to the lower part

of the anterior border.

14 The interosseous membrane is attached to the lower

three-fourths of the interosseous border.

Olecranon process

Brachialis

Head

Oblique cord

Supinator

Flexor digitorum

superficialis

Capsular ligament

Flexor digitorum

superficialis

Pronator teres

Biceps brachii

Flexor digitorum

profundus

I

Pronator teres Anterior border

Flexor pollicis

longus

Lateral border

s
.E
J
o
CL
6L
f

c

,o

o(l)

a

Radial artery

Brachioradialis

Styloid process

Pronator quadratus

Capsular ligament

Styloid process

Attachment of articular

disc

Fig. 2.25: Attachments of right radius and ulna: Anterior aspect