Table 1 Intraspecific variations of the extensor tendons of the carpus and digits in the domestic dog

1

F

R

-

A double tendon for the bases of metacarpals III and IV

Having ED III

-

-

L

-

Having a fan-shaped tendinous expansion to insert on the shaft of metacarpal V

Having ED III

-

-

2

F

R

A double tendon; the extra one joining the main tendon of its counterpart near the distal end

Splitting above the carpus to insert on the bases of metacarpals III and IV

-

-

-

L

A double tendon; the extra one joining the main tendon of its counterpart near the distal end

Splitting at the carpus to insert on the bases of metacarpals III and IV; having a long tendinous slip to unite with ED II

Anomalous origin of ED III

-

-

3

M

R

-

Splitting above the carpus; the abaxial slip inserting on the lateral aspect of the base of metacarpal III

-

-

-

L

Splitting above the carpus; the abaxial slip inserting on the base of metacarpal III medial to the insertion of ECRB

-

-

-

-

4

M

R

-

-

-

-

-

L

Having a thin tendinous slip to insert on the base of metacarpal I

-

-

-

-

5

M

R

Having a long tendinous slip to unite with EDC II at the MCP joint as well as a fine tendinous slip to insert on the medial aspect of the base of metacarpal II

Having a fan-shaped tendinous expansion to insert on the base of metacarpal IV

Ectopic insertion of ED II into digit III

-

-

L

-

Having a long tendinous slip to unite with EDC III next to the insertion of EDL III

-

-

-

6

 F

R

-

Having a fine tendinous slip to insert on the carpal joint capsule

-

-

-

L

-

-

-

EDC III having a sagittal fissure at the MCP joint

-

7

F

R

-

Splitting at the distal end; the abaxial slip inserting on the bases of metacarpals III and IV

-

-

An absent EDL III

L

-

Splitting at the distal end; the abaxial slip inserting on the bases of metacarpals III and IV

-

-

An absent EDL III replaced by a fascial band

8

 M

R

-

Partial splitting at the carpus

-

-

-

L

-

Partial splitting at the carpus

-

-

-

9

F

R

-

-

-

-

-

L

-

Having a long tendinous slip to unite with EDL III

-

-

-

10

F

R

-

-

-

-

-

L

-

Having a long tendinous slip to unite with EDL III

-

-

-

11

M (German Shepherd)

R

-

-

Having ED III

-

An absent EDL III

L

-

-

Having a split ED II with two insertions; the anomalous origin of ED III

-

Having an accessory slip stemming from EDL V above the MCP joint

12

F

R

-

-

Having ED III

-

-

L

Having a split ED II with one insertion; the replacement of ED III by a fascial band

13

F

R

-

-

-

-

-

L

-

-

-

-

Ectopic origin of EDL III from the dorsal metacarpal fascia

14

F

R

Having a split ED II with two insertions

L

Having a split ED II with two insertions

15

M

R

-

-

Having ED III

An oblique connecting filamentous band between EDC IV and EDC V

-

L

-

-

Having ED III

-

-

16

F

R

-

-

Having ED III

-

Having an accessory slip stemming from EDL V above the MCP joint

L

-

-

-

-

Having an accessory slip stemming from EDL V above the MCP joint

17

M

R

-

-

-

EDC III having a sagittal fissure at the MCP joint

-

L

-

-

-

-

-