PAS407 (Class 10) - The Hand UPDATED ACTUAL Questions and
CORRECT Answers
1. Overview Intricate dexterity = precision allows for a varying degree of manipulation and
control
- opposition due to 90 degrees rotation of 1st digit
Note: the amount of the motor cortex dedicated to the hand is actually greater than
the amount dedicated to all the other compartments of the upper limb combined
2. Bones of the Articulate with the radius proximally
hand
Articulate with the metacarpal bones distally
Carpal Bones
Arranged in 2 rows with 4 bones a piece
3. Carpal Bones - Boat shaped appearance (meaning of scaphoid)
(Proximal Row)
- concave distal surface
Scaphoid Bone - convex proximal surface
- Bone is separated by a neck into proximal and distal regions
- prominent tubercle on the palmar surface for attachment of the transverse carpal
ligament (where red dot is on pic)
, - Smooth proximal surface articulates with the distal surface of radius
- Convex surface articulates with 4 of the other carpal bones
4. Carpal Bones Lunate = moon shaped
(Proximal Row)
- lies medial to scaphoid
Lunate Bone - articulates with scaphoid through the concave surface
Articulates with triangular disc in a neutral hand position
5. Carpal Bones Named for Pyramidal appearance
(Proximal Row)
- Doesn't actually contribute to the wrist joint in a neutral wrist position
Triquetrium Bone
- only when wrist is in ULNAR DEVIATION, the triquetrium articulates with the
articular disc covering the ulna
Articulates with:
- Lunate laterally
- Hamate distally
- Pisiform anteriorly
6. Carpal Bones Named after its pea shaped appearance
(Proximal Row)
, - Considered part of the first row of carpal bones, but sits on a separate plane
Pisiform Bone anterior to other bones
- only articulation is with the triquetrium posteriorly
- serves as a sesamoid bone, floating in the tendon of the flexor carpi ulnaris
- Pisiform + Hook of Hamate forms a lateral elevation providing protection to the
ulnar n.
- these 2 also form a lateral anchor for the transverse carpal ligament (roof of carpal
tunnel)
7. Carpal Bones In latin = "little table"
(Distal Row) - named so since it serves role in supporting the first metacarpal on the scaphoid
Trapezium Bone Distal articular surface is saddle-shaped, forming a saddle joint with the compli-
mentary surfaces on the first metacarpal bone
Carpal / Metacarapl articulation is critical in thumb opposition and versatility of
hand function
8. Carpal Bones Articulating with the medial surface of the trapezium is the TRAPEZOID
(Distal Row)
- name reflects its geometric shape
Trapezoid Bone
- articulates with the scaphoid proximally and the 2nd metacarpal distally
CORRECT Answers
1. Overview Intricate dexterity = precision allows for a varying degree of manipulation and
control
- opposition due to 90 degrees rotation of 1st digit
Note: the amount of the motor cortex dedicated to the hand is actually greater than
the amount dedicated to all the other compartments of the upper limb combined
2. Bones of the Articulate with the radius proximally
hand
Articulate with the metacarpal bones distally
Carpal Bones
Arranged in 2 rows with 4 bones a piece
3. Carpal Bones - Boat shaped appearance (meaning of scaphoid)
(Proximal Row)
- concave distal surface
Scaphoid Bone - convex proximal surface
- Bone is separated by a neck into proximal and distal regions
- prominent tubercle on the palmar surface for attachment of the transverse carpal
ligament (where red dot is on pic)
, - Smooth proximal surface articulates with the distal surface of radius
- Convex surface articulates with 4 of the other carpal bones
4. Carpal Bones Lunate = moon shaped
(Proximal Row)
- lies medial to scaphoid
Lunate Bone - articulates with scaphoid through the concave surface
Articulates with triangular disc in a neutral hand position
5. Carpal Bones Named for Pyramidal appearance
(Proximal Row)
- Doesn't actually contribute to the wrist joint in a neutral wrist position
Triquetrium Bone
- only when wrist is in ULNAR DEVIATION, the triquetrium articulates with the
articular disc covering the ulna
Articulates with:
- Lunate laterally
- Hamate distally
- Pisiform anteriorly
6. Carpal Bones Named after its pea shaped appearance
(Proximal Row)
, - Considered part of the first row of carpal bones, but sits on a separate plane
Pisiform Bone anterior to other bones
- only articulation is with the triquetrium posteriorly
- serves as a sesamoid bone, floating in the tendon of the flexor carpi ulnaris
- Pisiform + Hook of Hamate forms a lateral elevation providing protection to the
ulnar n.
- these 2 also form a lateral anchor for the transverse carpal ligament (roof of carpal
tunnel)
7. Carpal Bones In latin = "little table"
(Distal Row) - named so since it serves role in supporting the first metacarpal on the scaphoid
Trapezium Bone Distal articular surface is saddle-shaped, forming a saddle joint with the compli-
mentary surfaces on the first metacarpal bone
Carpal / Metacarapl articulation is critical in thumb opposition and versatility of
hand function
8. Carpal Bones Articulating with the medial surface of the trapezium is the TRAPEZOID
(Distal Row)
- name reflects its geometric shape
Trapezoid Bone
- articulates with the scaphoid proximally and the 2nd metacarpal distally
