Equine Clinical Anatomy Exam Flashcards
List the correct directional terms for 1-11
- Caudal
- Rostral
- Proximal
- Distal
- Cranial (above carpus)
- Dorsal (below carpus)
- Caudal (above carpus)
- Palmar (below carpus)
- Cranial (above tarsus)
- Dorsal (below tarsus)
- Palmar (below tarsus)
What is the veterinary term for hock
Tarsus
What is the veterinary term for knee
Carpus
What is the veterinary term for the medial splint bone
MCII
What is the veterinary term for the cannon bone
MCIII
What is the veterinary term for the lateral splint bone
MC IV
What is the veterinary term for fetlock or ankle
Metacarpo-pharyngeal (ankle)
Torso pharyngeal (fetlock) joint
What is the veterinary term for long pastern bone
First phalanx/P1/proximal phalanx
What is the veterinary term for the short pastern bone
Second phalanx/P2/proximal phalanx
What is the veterinary term for the coffin bone
P3
What are the 4 nerve blocks commonly performed in the foot and forelimb
- Palmar digital
- Abaxial sesamoid
- Low 4 point/low palmar
- High 4 point/high palmar
What are the 4 common sites of joint injections in the foot and forelimb
- Distal interphalangeal joint
- Metacarpophalangeal joint/fetlock
- Middle carpal joint (capus)
- Radio carpal joint (carpus)
What are some reasons to do nerve blocks
- Diagnose lameness
- Desensitize area for surgery
What is the correct technique for nerve blocks
Needle bevel up and inserted subcutaneously over the nerve
What is the “heel block”
Palmar/plantar digital nerve block
What is desensitized in palmar/plantar digital nerve block
- Palmar/plantar 2/3’s of the foot
Structures: - Entire sole, navicular structures, distal interphalangeal joint, distal DDFT, distal sesamoidean ligaments
What doesn’t the palmar/plantar digital nerve block
Front of fetlock, gets caudal 75% of heel
What is the most common site of lameness
Heel
What does the abaxial sesamoid nerve block
Foot, P2, proximal interphalangeal joint, distopalmar/plantar aspect of proximal phalanx (P1), distal portions of SDFT and DDFT, distal sesamoidean ligaments and distal annular ligament
What doesn’t the abaxial sesamoid nerve block get
Proximal, front of P1 or pastern joint
What is desensitized in the low 4 point/low palmar nerve block
Metacarpo/ tarsophalangeal joint and structures distal, distal aspect of suspensory branches
what 4 nerves are you hitting with the 4 point/low palmar nerve block
- Medial palmar metacarpal nerve
- Lateral palmar metacarpal nerve
- Medial palmar nerve
- Lateral palmar nerve
What does the high 4 point/high palmar nerve block
- Medial and lateral palmar nerves- DDFT and SDFT
- Medial and lateral palmar metacarpal nerves- MC2, MC4, proximal suspensory ligament/origin
- All 4 get inferior check ligament
Why would you perform joint injections
- Tx arthritis
- Joint fluid sample to diagnose sepsis
- Joint lavage to diagnose communication with wound/laceration
- Joint lavage to tx sepsis
What is desensitized in the distal interphalangeal joint block
- Joint
- Navicular bursa
What is desensitized in the metacarpo/ tarsophalangeal joint block
Joint, fetlock
What bones make up the carpus
Proximal row: radial, intermediate and ulnar
Distal: 2-4
What are the 3 joints in the carpus
- Radiocarpal
- Middle/inter carpal joint
- Carpometocarpal
What two joints in the carpus communicate with each other
Middle/intercarpal and the carpomemetcarpal
Carpus- label 1-9
- Intermediate carpal bone
- Ulnar carpal bone
- 4th carpal bone
- Radial carpal bone
- 3rd carpal bone
- 2nd carpal bone
- Radiocarpal joint
- Middle/intercarpal joint
- Carpometacarpal joint
Carpus- label 1-9
- Accessory bone (lateral)
- 4th carpal bone
- 4th metacarpal bone
- Intermediate carpal bone
- Ulnar carpal bone
- Third carpal bone
- Radiocarpal joint
- Middle/intercarpal joint
- Carpometacarpal joint
Carpus label 1-4
- Radial carpal bone
- 3rd carpal bone
- Accessory carpal bone
- Second carpal bone
*medial view
What is desensitized in the Radiocarpal joint injection block
Radiocarpal joint ONLY- does not communicate with other joints
What is desensitized in the middle/intercarpal joint block
- Middle/intercarpal joint
- Carpometacarpal joint
**both are blocked because these two joints communicate
What suspends P3
Epidermal and dermal laminae
What is the purpose of the laminae/equine foot during locomotion
Shock absorption
Which lamina in the foot is attached to the hoof wall
Epidermal laminae
Which lamina is attached to P3
Dermal laminae
Label 1-6
- Extensor tendon
- Coronary band
- Laminae
- DDFT
- Lateral cartilage
- Heel bulb
What is laminitis
Inflammation/ degeneration of the laminae
What are the two types of laminitis
- Rotation of P3 (more common)
- Sinking of P3 within the hoof capsule
What causes rotation of P3 in laminitis
Laminae on the dorsal midline of the toe die
What causes the sinking of P3 within the hoof capsule in laminitis
Laminae die circumferentially
What is the most common cause of acute lameness
Laminitis
Which X-ray is normal and which shows laminitis and how do you know?
Left: normal
Right: laminitis
Right photo P3 is detached from laminae resulting in sharper angle and the lines from hoof wall and P3 intersect, in normal patients they would be parallel
What is the most common cause of chronic forelimb lameness
Navicular disease
What is navicular disease
Chronic degeneration of the navicular bone
Navicular disease involves what 4 things
- Loss of medullary architecture with subsequent synovial invagination (lollipops on X-ray)
- Bone sclerosis with damage to fibrocartilage on flexor surface
- Traumatic fibrillation of DDFT
- Entesiophyte formation
Identify 1-3
- Navicular one
- DDFT
- Navicular bursa
what is wrong here and which is normal vs abnormal
Navicular disease, top=normal, bottom= navicular disease
What is wrong here, which is normal vs abnormal and how do you know
left: normal
Right: abnormal
Loss of medullary architecture and increase synovial invaginations- loop like lollipops and damaged flexor surface
Intact flexor surface should be smooth so DDFT can slide over
what is wrong here and what is indicated by 1-2
Navicular disease
1. Enthesiphyte
2. Synovial invagination (lollipop)
What is wrong here and what is indicated by 1-2
navicular disease
1. Edema of navicular bone
2. Normal joint fluid
T or F: penetrating wounds of the foot are always considered life threatening
True
What structure might be damaged by the nail
DDFT
What structures can be affected by penetrating wounds of the foot (7)
- Ungual/collateral cartilage
- Digital flexor tendon sheath
- DDFT
- Navicular bursa
- Navicular bone
- Distal interphalangeal joint
- P3
Out of the 7 structures that can get damaged via penetrating wounds of the foot, what 3 are of big concern due to the presence of synovial fluid and why does that increase the concern
- Digital flexor tendon sheath
- Navicular bursa
- Distal interphalangeal joint
Concern because perfect medium for bacteria
What trajectory of the penetrating wound is typically worse and why (what structure does it pass through externally)
Through the frog because increase likelihood of hitting DDFT and navicular
What is desmitis
Inflammation of the ligament
How long does it take tendinitis/tendon injuries to heal
6 months
How long does it take for desmitis/ligament injuries to heal
8 months
Identify 1-3
- Suspensory ligament
- Sesamoid bones
- Distal sesamoidean ligament
The following is an ultrasound of equine distal forelimb, identify 1-4. Ultrasound is taken from caudal aspect
- SDF
- DDF
- check ligament
- Suspensory ligament
the following is an ultrasound of distal equine forelimb taken from caudal aspect, what is the problem. Label top and bottom structures
Problem: superficial digital flexor tendinitis- hematoma in the tendon
Top: SDFT
Bottom: DDFT