Hoof growth
detaching, shifting, and reattaching connections between primary and secondary epidermal lamellae
distal sesamoidean ligaments
annular ligaments
palmar annual
proximal digital annular
distal annular
middle scutum
fibrocartilaginous extension of prox palamr P2
bearing surface
stabilizes palmar aspect of pastern
extensor tendon insertion
proximolateral P1 and extensor process P3
flexor tendon insertion
SDFT: medial and lateral P1 and middle scutum
DDFT: palmar P3
suspensory ligament insertion
abaxial surface of sesamoid bones
extensor branches join common extensor tendon
Distal sesamoidean ligaments
dorsal metacarpal disease
“too much work too fast”
high strain cyclic fatique results in new bone growth,
most important treatment is training modification
expose Mc3 to short burst at racing speed rather than hige miles of slower work
MC/MT: condylar fracture
most commonly flat racing horses, also harness racing
25% of racetrack fatal musculoskeletal injuries
75% on lateral aspec of LF in TBs
usually begin 4mm from sagittal ridge
palmar/plantar communition 15%
Carpus (anatomy)
carpal canal
carpal canal encloes carpal sheath
- sheath extentds from distal radius to proximal metacarpus
- SDFT, superior check, DDFT, flexor carpi radialis, flexor carpi ulnaris, vessels and nerves
- accessory carpal bon eforms lateral aspect
carpus (conditions)
OCD and DJD
race horses
hyperextension
fatique during race or conformation
cubital (elbow) joint (anatomy)
high motion hinge joint
stabilized by:
-anconeal procress of olecranon
- collateral ligaments
- biceps muscle insertion
- brachialis muscle insertion
lateral muscle group (scapulohumeral joint)
supraspinatus m. (extensor of shoulder)
infraspinatus m. (flexor of shoulder) (acts as lateral collateral lig.)
deltoideus m. (shoulder flexor)
medial muscle group (scapulohumeral joint)
subscapularis m. (shoulder felxor) (acts as medial coll. lig)
teres major m. (shoulder flexor)
cranial muscle group (scapulohumeral joint)
biceps m. (fixator of the shoulder)
- fibrocartilaginous tendon over cranial shoulder
- lacertus fibrosis– tendon that inserts on extensor carpi radialiis muscle to passively entend the carpus
muscles of the upper forlimb
flexors of the elbow and lower forarm:
- biceps brachii m. and brachialis m.
estensors of the elbow
Triceps m.: three heads insert in olecranon
- long head: orig: caudal scapula
- lateral and medial heads: origin caudal humerus
- lack of functional results in dropped elbow
Forearm extensors
common origins: craniolateral aspect of the distal humerus
each synovial sheath over carpus
ALL (exept ulnaris lat.) extend carpus
all inervated by radial nerve
forearm extensors (insertions)
*extensor carpi radialis m.
-> proximodorsal MC3
*common digital extensor m.
-> extensor process P3
*lateral digital extensor m.
-> prox P1
*ulnaris lateralis m.
-> acc. carpal bone, head of MC4
Forearm flexors
origin: caudomedial humerus
innervation: media and ulnar n.
all flex carpus
Forelimb trunk muscles
trapezius m.
brachiocephalicus
latissimus dorsi
pectoralis descendens
pectoralis transversus
rhomboidius
serratus ventralis
Tarsus (skeleton)
prox row: calcaneus, Talus
middle: central tarsal
distal: 4th, 3rd, fused 1st and 2nd tarsal
Tarsus (syndemology)
Prox: Tarsocrural (tibiotarsal): high motion
prox intertarsal: communicates with tarsocural. low motion
distal intertarsal, low motion
TMT communicates 25% with DIT