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General Definitions & Terminology
General Definitions & Terminology
- Distal Limb Range: Extends from the pedal bone to the carpus (front foot) or the tarsus (hind foot).
- Bovine Foot: The structure distal to the fetlock joint, consisting of two digits extending from the accessory digits (dewclaws) to the distal end of the third phalanx (P3).
- Proper Terminology: According to international standards, the distal limb within the horn capsule in ruminants should be called the "hoof" rather than a "claw" (a term reserved for carnivores).
Skeletal Structure & Joints
Skeletal Structure & Joints
- Phalanges:
- Proximal Phalanx (P1): The first phalanx.
- Middle Phalanx (P2): The second phalanx.
- Distal Phalanx (P3): Also known as the pedal bone or coffin bone.
- Joints:
- Proximal Interphalangeal (PIP) Joint: Articulation between P1 and P2.
- Distal Interphalangeal (DIP) Joint: Articulation between P2 and P3.
- Fetlock Joint: The metacarpo- or metatarsophalangeal joint.
- Flexor Tuberosity: Located on the ventral aspect of P3; site where the deep flexor tendon attaches.
The Hoof: Segments and Tissues
The Hoof: Segments and Tissues
- Five Unique Segments: Periople, coronary, wall, sole, and bulbar.
- Tissue Layers:
- Epidermis: The outer horn-producing capsule.
- Dermis (Corium): Contains vessels, nerves, and dermal lamellae to support the epidermis.
- Subcutis: A connective tissue and fat layer acting as a cushion. Present in the periople, coronary, and bulbar segments, but absent in the wall and sole.
- Horn Characteristics:
- Hardest Horn: Produced by the periople, coronary, and wall segments.
- Softest Horn: Found in the proximal bulb.
- White Line: Solely produced by the wall segment.
Support & Weight-Bearing Mechanisms
Support & Weight-Bearing Mechanisms
- Weight Distribution:
- Front Feet: The medial hoof is larger and bears more weight.
- Hind Feet: The lateral hoof is larger and bears more weight.
- Suspensory Apparatus: A collagen fiber system anchoring P3 to the basement membrane of the hoof capsule; it transfers the animal’s body weight to the hoof wall.
- Digital Cushion: Found in the subcutis of the bulbar segment; it works with the suspensory apparatus to absorb and dissipate forces during locomotion.
- Clinical Note: Continuous pressure from the flexor tuberosity on the corium can lead to hemorrhage and ulceration.
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