Coffin bone

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Coffin bone from the side and above . 1 processus extensorius, 2 facies articularis, 3 processus palmaris, 4 incisura processus palmaris, 5 sulcus parietalis, 6 foramen parietale, 7 margo solearis, 8 crena marginis solearis, 9 margo coronalis

The coffin bone ( os ungulare ) is the last phalanx or toe of a horse's limbs . It is part of the bony supporting skeleton of the hoof .

anatomy

A distinction is made between three surfaces on the coffin bone: the convex wall surface ( Facies parietalis ), the concave sole surface ( Facies solearis ) and the joint surface ( Facies articularis ) for connection with the corolla bone .

The sole surface is separated by a crescent-shaped line ( Linea semilunaris ) into the anterior skin field ( Planum cutaneum ) and the posterior flexor surface ( Facies flexoria ). The deep flexor tendon attaches to the facies flexoria . The sole hole ( foramen soleare laterale or mediale ), which lead into the sole canal ( canalis solearis ), is located on both sides of this attachment surface . This contains an arterial and venous blood vessel arch ( arcus terminalis ) to supply the coffin bone. From the vascular holes and supply the hoof dermis.

The wall surface has a wall furrow on both sides ( sulcus parietalis lateralis or medialis ) as well as numerous holes for blood vessels emerging from the interior to supply the corium . The largest hole is the lateral or medial parietal foramen , which is at the end of the respective wound furrow. The wall and sole surface meet at the supporting edge ( Margo solearis ), which usually has a shallow indentation ( Crena marginis solearis ).

The joint surface is used for the articulated connection with the joint role of the corolla and the navicular bone . The border between the wall and the joint surface is the coronet ( Margo coronalis ). In the middle it carries the extensor process ( processus extensorius ), on which the tendon of the extensor digitorum communis muscle inserts.

The two coffin bone branches ( processus palmaris / plantaris lateralis and medialis ) are extensions of the coffin bone to the rear. They are notched by an incision ( Incisura processus palmaris ). This notch can also be closed by a bone bridge to form a hole ( foramen processus palmaris ). The cartilage ( cartilago ungularis medialis and lateralis ) is attached to the coffin branch . Breaks the Hufbeinäste are the most common form of Hufbeinfraktur .

literature

  • Franz-Viktor Salomon: Bony skeleton. In: F.-V. Salomon et al. (Ed.): Anatomy for veterinary medicine. Enke-Verlag, Stuttgart 2004, ISBN 3-8304-1007-7 , pp. 37-110.