488 



THE HORSE'S POSITION IN THE ANIMAL WORLD 



the horse; (2) the three floating bones or sesamoids, of which two are 

 attached to the back of the lower end of the metacarpal bone and one 

 navicular behind the last phalanx, or rather between it and the articular 

 end of the bone immediately above it, the coronal bone or short pastern. 



Fig. 656. — Section of Finger of Man 



1. Metacarpal bone. 



2. First piialanx. 



3. Second phalanx. 



4. Third or ungual phalanx (pedal bone of horse). 

 {5-G wanting). 



7. Tendon of extensor muscles. 



8. Tendon of superficial flexor (flexor perforatus). 



9. Tendon of deep flexor (flexor perforans). 

 11 and 14. Derma or true skin. 



15. Nail (imperfect hoof of horse). 



17. Fibro-fatty cushion of end of finger. 



18. Fibro-fatty cushion of palm behind metacarpal 



phalangeal joint. 



19. Thickened epidermal covering of the same. 



i* 17 



Fig. 657. — Section of Foot of Horse 



Metacarpal bone. 



First phalanx. 



Second phalanx. 



Third or ungual phalanx. 



One of the upper sesamoid bones. 



Lower sesamoid or navicular bone. 



Tendon of extensor muscle. 



Tendon of superficial flexor (flexor perforatus). 



Tendon of deep flexor (flexor perforans). 



Short flexor or suspensory ligament of the fetlock. 



Derma or true skin continued into 



Coronary cushion. 



14. Villous portion of the hoof matrix. 



Hoof. 



The heel. 



Plantar cushion. 



Fibro-fatty cushion of the fetlock. 



Horny excrescence or spur (ergot). 



In the human hand two sesamoid bones are found where the thumb 

 articulates with the first metacarpal bone on the inner or palm surface. 

 None exists elsewhere in the hand. 



When we give full weight to the points of difference in the fore-limbs 

 of the horse, as compared with the upper (fore) extremity of man, the 

 similarity in the details of the plan of construction in both man and horse 

 must seem far more striking than the variations, and this fact, taken in 



