Human Anatomy Vol 1

ii. The palmar nonarticular surface is prolonged

laterally.

7 The capitate:The dorsomedial angleis the distal-most
projection from the body of the capitate. It bears a
small facet for the 4th metacarpal bone.

8 The hamate: The hook projects from the distal part of
the palmar surface, and is directed laterally.

Atlochments

There are four bony pillars at the four corners of the
carpus. All attachments are to these four pillars
(Fis.nq.

I The tubercle of the scaphoid:

i. The flexor retinaculum,

ii. A few fibres of the abductor pollicis brevis.

2 The pisiform gives:

i. Flexor carpi ulnaris,

ii. Flexor retinaculum and its superficial slip,

iii. Abductor digiti minimi,

iv. Extensor retinaculum.

3 The trapezium:

i. The crest gives origin to the abductor pollicis breais,

I ' flexor pollicis breois, and opponens pollicis. These

constitute muscles of thenar eminence.

ii. The edges of the groove give attachment to the

two layers of the flexor retinaculum.

iii. The lateral surface gives attachment to the lateral

ligament of the wrist joint.

iv. The groove lodges the tendon of the flexor carpi

radialis.

4 The hamate:

i. The tip of the hook gives attachment to the flexor

retinaculum.

ii. The medial side of the hook gives attachment to

the flexor digiti minimi and the opponens digiti

minimi.

Articulotions

L The scaphoid: Radius, lunate, trapezium, trapezoid

capitate (Fig.23$.

2 The lunate: Radius, scaphoid, capitate, hamate and

triquetral.

3 The triquetral: Pisiform, lunate, hamate and articular

disc of the inferior radioulnar joint.

4 The pisiform articulates only with the triquetral.

5 The trapezitm: Scaphoid, 1st and 2nd metacarpals

and trapezoid.

6 The trapezoid: Scaphoid, trapezium,2nd metacarpal

and capitate.

7 The capitate: Scaphoid,lunate, hamate, 2nd,3rdand

4th metacarpals and trapezoid.

8 The hamate: Lunate, triquetral, capitate, and 4th and

5th metacarpals.

Proximal phalangeas

1-5 metacarpals

Pisiform

Triquetral

Styloid process of ulna

Capitate

Sesamoid bones

Trapezoid

Trapezium and its crest

Styloid process of radius

Scaphoid

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CL

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Fig. 2.34: Skeleton of the right hand o