U6: Hand Bones & Joints

label the features (ANT hand)

1. A - carpals

2. B - metacarpals

3. C - proximal phalanages

4. D - middle phalanges

5. E - distal phalanges

label the features (carpal bones)

1. A - scaphoid

2. B - lunate

3. C - triquetrum

4. D - pisiform

5. E - hamate

6. F - capitate

7. G - trapezoid

8. H - trapezium

label the features (wrist joints)

1. A - radiocarpal RC joint

2. B - triangular fibrocartilage complex (FCCC)

3. C - carpometacarpal CMC joint

what is the radiocarpal joint (RC)

the true wrist joint

• found between the radius/carpals

• an ellipsoid joint

movements permitted by the RC joint

1. flex/extend

2. abduct/adduct

what is the carpometacarpal joint (CMC)

a plane joint

• found between the metacarpals/carpals

how do the carpometacarpal joints work

1. MC 1 → trapezium

2. MC 2 → trapezoid

3. MC 3 → capitate

4. MC 4 + 5 → hamate

movements permitted by the CMC joint

permits the hand to adapt to shapes in your grasp

what is the carpometacarpal joint (CMC - thumb)

a saddle joint

movements permitted by the CMC joint (thumb)

1. flex/extend

2. abduct/adduct

3. opposition

what is the triangular fibrocartilaginous complex (TFCC)

refers to a disc

• found between the ulnar head / carpals

structure of the TFCC

1. it is reinforced by ligaments

2. attaches from the ulnar styloid process / ulnar notch edges

function of the TFCC

1. shock absorption

2. helps to extend articulation b/w the ulna, radius, carpals

label the features (hand joints)

1. A - metacarpophalangeal (MCP) joint

2. B - proximal interphalangeal (PIP) joint

3. C - distal interphalangeal (DIP) joint

what is the metacarpophalangeal joint (MCP)

a condyloid joint

• found between the metacarpals/proximal phalanges

movements permitted by the metacarpophalangeal joint (MCP)

1. flex/extend

2. abduct/adduct

what is the PIP joint

a hinge joint

• found between the proximal phalanges / middle phalanges

what is the DIP joint

a hinge joint

• found between the middle phalanges / distal phalanges

movements permitted by the PIP/DIP joint

1. flex/extend

label the features (finger ligaments)

1. A - collateral ligament(s)

2. B - palmar plate

3. C - deep transverse metacarpal ligament

what are the collateral ligaments

• found on either side of the MCP/IPs

• which resists displacement of the phalanges to either side

what is the palmar plate

or palmar ligaments

• on the anterior aspect of MCP/IPs

• which prevents tendons laying on the joint from becoming entrapped (getting pinched)

what is the deep transverse metacarpal ligament

• links MC 2-5 together

• which prevents separation of MC 2-5