Human Anatomy Vol 1

joint of the thumb and a wide variety of functionally
useful movements take place here. ldentify the distal
surface of trapezium and base of first metacarpal bone.
Define the metacarpophalangeal and interphalangeal
joints.

For their dissection remove all the muscles and

tendons from the anterior and posterior aspects of any

two metacarpophalangeal joints. Define the articular

capsule and ligaments. Do the same for proximal and

distal interphalangeal joints of one of the fingers and

define the ligaments.

JOINTS OF UPPER LIMB

Fig. 10.30: Aspiration of the wrist joint

INTERME RPAL JOINTS

There are three joint cavities among the intercarpal,

carpometacarpal and intermetacarpal joints, which are:

L Pisotriquetral,

2 First carpometacarpal, and

3 A common cavity for the rest of the joints. The

corrunon cavity may be described as the midcarpal

(transverse intercarpal) joint between the proximal

and distal rows of the carpus, which communicates

with intercarpal joints superiorly, and with

intercarpal, carpometacarpal and intermetacarpal

joints inferiorly (Fig. 1.0.2\.

The midcarpal jointpermits movements between the

two rows of the carpus as already described with the

wrist joint.

First carpometacarpal joint is only carpometacarpal

joint which has a separate joint cavity. Movements at

this joint are, therefore, much more free than at any

other corresponding joint.

rype

Saddle variety of synovial joint (because the articular

surfaces are concavoconvex).

Atliculor Surfoces

i. The distal surface of the trapezium

ii. The proximal surface of the base of the first

metacarpal bone.

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