Lab 15 and 16 The Digit and Hoof, Passive Stay Apparatus summary Flashcards

1
Q

layers of the hoof wall

A
  • stratum externum
  • stratum medium
  • stratum internum
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2
Q

cartilages of the hoof

A

-sagital plates attached to palmar processes of PIII and projecting a little above the hoof

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3
Q

digital cushion

A
  • yielding nature
  • during overextension of the fetlock this is compressed between PII and the frog and the fusion presses against the cartilages and promotes outward movement of the quarters
  • found deep to bulbs of the heels and the frog
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4
Q

coronary cushion

A

same as coronary dermis? Thes is a dermal component of the hoof that bulges out, located between perioploic dermis and laminar dermis

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5
Q

bulbs of the heel

A

just the superficial portion of the heel; its the bulb

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6
Q

ligaments associated with proximal sesamoid bones

A
  • palmar ligament

- palmar annular ligament

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7
Q

ligaments associated with the distal sesamoid bones

A
  • collateral sesamoidean ligament

- impar ligament

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8
Q

other name for collateral sesamoidean ligament

A

proximal navicular ligament

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9
Q

other name for impartial ligament

A

distal navicular ligament

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10
Q

annular ligament

A

is a thickening of the deep fascia, has different names depending on location

  • palmar annular ligament
  • proximal annular ligament
  • distal annular ligament
  • digital tendon sheath surrounds flexor tendons, lies deep to the different regions of annular ligament
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11
Q

if digital tendon sheath bulges

A

may be seen in specific regions of the digit

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12
Q

Components of suspensory apparatus

A
  • body of the suspensory
  • medial and lateral suspensory branches
  • extensor branches
  • distal sesamoidean ligaments
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13
Q

when is suspensory apparatus action most visible in fetlock

A

during extreme overextension; at moment of impact thrust of MC3 borne largely by sesamoid bones and palmar ligament and suspensory ligament is under great tension

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14
Q

medial and lateral suspensory branches

A

in distal 1/3rd of cannon bone, attach to proximal sesamoid bones

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15
Q

body of the suspensory

A

proximal aspect arises form dorsal row of tarsal or carpal bones

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16
Q

extensor branches of suspensory

A

attach to extensor tendons, run along sides of digits

17
Q

distal sesamoidean ligaments

A
  • straight
  • oblique
  • cruciate
18
Q

straight sesamoidean ligaments

A

sesamoids attach to P2

19
Q

oblique sesamoidean ligament

A

sesamoids attach to P1

20
Q

cruciate sesamoidean ligament

A

sesamoids attach to P1

21
Q

fetlock, pastern, and coffin joints

A

have dorsal, palmar (or plantar) pouches

22
Q

superficial regions of hoof

A
  • wall
  • sole
  • heel
  • frog
  • bulbs
  • toe
  • quarters
23
Q

parts of frog

A
  • paracunean or collateral grooves

- central sulcus

24
Q

paracunean grooves

A

separate the bars from the frog

25
central sulcus of frog
the indent in the top/ middle of the frog
26
cartilages of hoof fx
facilitate slight expansion of hoof at the quarters when weight is placed on the limb
27
holes in cartilages of the hoofo
transmit veins of venous plexsus present in hoof dermis
28
digital cushion location
- wedge shaped mass of fibrous adipose tissue - is related to frog distally - related to deep flexor tendon proximally - related to cartilages of hoof medially and laterally - cd portion if partly SQ and divided by central depression into two bulbs of cushion - bulbs of cushion underlie bulbs of the heels
29
suspensory aka
interosseus
30
suspensory attaches to
- arises from distal row of carpal bones and proximal end of Mc3; passes distally applied to palmar surface of that bone and divides into two branches proximal to fetlock
31
medial and lateral branch of the suspensory ligament
attaches on abaxial hollowed surface of the medial sesamoid bone, sends thing extensor branch dorsodistally over the fetlock to common extensor tendon
32
extensor branch of suspensory
medial and lateral branch of the suspensory ligaments send thin extensor branch dorsodistally over the fetlock to the common extensor tendon
33
suspensory ligament components
body, medial and lateral branches, extensor branches, distal sesamoidean ligaments (straight, oblique, and cruciate)