Third Phalanx
For the purpose of analysis, lateral left and medial right elements are defined as left. Medial left and lateral right elements are defined as right.
For the Fincastle Project, Bone Units 16, 17 and 18 were added.
BU 1
SC A
Complete element.
BU 3
SC B
Similar to BU 1 except only the extreme distal end removed (1/4 or less of entire element length removed).
BU 13
SC C
Element missing only the angle, or extreme proximal end of the articular surface of the element. Opposite to BU 4. (GL)
BU 5
SC D
Element with extensor process missing. Limited portion of adjacent articular surfaces may also be missing. (DS)
BU 2
SC E
Complete proximal end of element. All or most of element distal to articular facets removed.
BU 15
SC F
Posterior half of whole element, splitting the articular surface. (GL)
BU 14
SC G
Element missing the anterior border only. (WU)
BU 7
SC H
Extensor process of element. May also include limited portions of adjacent articular surfaces. Opposite of BU 5. (DS)
BU 4
SC I
Piece from extreme proximal end of element, or angle of P-3. Limited portion of adjacent articular surface present. (EMA)
BU 8
SC J
Unit consists of lateral half of element, only half of articular surface present. (DS)
BU 11
SC K
Lateral half of the proximal end of the element. Most of the element distal to the articular facets is missing. (WU)
BU 10
SC L
Medial half of element split along the sagittal plane, and with extreme distal end missing. (WU)
BU 12
SC M
Medial half of the proximal end of the element. Most of the element distal to the proximal articular facets is missing. (WU)
BU 9
SC N
Lateral piece of element distinguished by the shape, foramen and porous nature of bone. (DS)
BU 6
SC O
Unit consists of distal tip only. Opposite of BU 3. (DS)
BU 16
SC P
Missing bottom portion. Opposite to BU 14.
BU 17
SC Q
Element consists of medial half of element, with one or two articular elements present. Opposite to BU 8.
BU 18
SC R
Element contains both articular surfaces (proximal), but only the lateral half of the rest of the element. Similar to BU 8.