A11 - Fetlock joint and sesamiod ligaments

Question 1

What is another name for the fetlock joint?

Answer 1

Metacarpophalangeal joint

Art. metacarpophalangeae

Question 2

Classification of the fetlock joint

Answer 2

• Diarthrosis
• Hinge joint (monoaxial)
  
  • ​Movement: flexion - extension (and minimal side movement)

Question 3

Between where does the fetlock joint articulate?

Answer 3

Joints between metacarpal bones → proximal phalanges and proximal sesamoid bones

Question 4

1. Give the structures of the fetlock joint in the horse
2. Draw the fetlock joint in the horse

Answer 4

• Capsula articulares
  
  • Recessus dorsalis
  • Recessus palmaris
• Lig. collaterale mediale
• Lig. collaterale laterale
• Proximal sesamoid ligaments
  
  • M. interosseus medius
    
    • Metacarpal bones, basis → proximal sesamoid bones
    • Givingtractus appositus toward m. extensor digitorum communis (part of the passive stay apparatus)
  • Ligg. metacarpointersesamoideum
    
    • ​Lig. palmare → MCIII
• Middle sesamoid ligaments
  
  • Ligg. palmaria
    
    • ​Unites with the two sesamoid bones
    • Forms the scutum proximale
  • Ligg. sesamoidea collateralia
    
    • ​Proximal sesamoid bones → metacarpus, and Ph1
• ​Distal sesamoid ligaments
  
  • M. interosseus
  • Lig. sesamoideum rectum
    
    • ​Proximal sesamoid bones → Ph1 and Ph2
    • Also called Y-ligament
  • Ligg. sesamoidea obliqua
    
    • ​Proximal sesamoid bones → Ph1
    • Also called V-ligament
  • Ligg. sesamoidea cruciata
    
    • ​Crossing fibers from the distal border of sesamoid bone → Ph1
    • Also called X-ligament
  • Ligg. sesamoidea brevis
    
    • ​Distal border of sesamoid bone → Ph1
• Arrangement of the sesamoid ligaments function as a suspensory or stay apparatus for the fetlock joint

Question 5

Ruminant

Draw the fetlock joint

Answer 5

Ligaments special for ruminants:

• Lig. intersesamoideum interdigitale (bo)
  
  • Between the axial sesamoid bone
• Lig. phalangosesamoideum interdigitale (bo)
  
  • Between Ph1 of one digit and the axial sesamoid bone of the other
• ​Lig. interdigitale proximale (bo, su)
  
  • Between proximal halves of Ph1 of digits III and IV

Question 6

List the structures in the fetlock joint

Answer 6

• Capsulae articulares
  
  • Recessus dorsales
  • Recessus palmares
• Ligg. collateralia (mediale/laterale)
• Ligg. palmaria
  
  • Scutum proximale
• Ligg. sesamoidea collateralia
• Lig. metacarpointersesamoideum (eq)
• Lig. intersesamoideum interdigitale (bo)
• Lig. sesamoideum rectum (eq)
• Ligg. sesamoidea obliqua (eq)
• Ligg. sesamoidea brevia (Un)
• Ligg. sesamoidea cruciata
• Lig. phalangosesamoideum interdigitale (bo)
• Lig. metacarpeum transversum profundum (ca, su)
• Lig. interdigitale proximale (bo, su)

Se definisjoner i egene notater

Question 7

Manica flexoria

Answer 7

Proximal to the fetlock joint, the superficial flexor tendon forms within the synovial sheath a ring-like sleeve around the deep flexor tendon