Anatomy - PL Of EQ Flashcards
Location of pelvic chestnuts
Distal to tarsus
May be absent
Smaller in mules, absent in donkeys
Chestnuts are land marks for
Origin of suspensory ligament
Difference between forelimb chestnuts and hindlimb
Carpal chestnut is proximal to carpus
Tarsal chestnut is distal to tarsus
Ergot function
In motion, fetlock joint sinks and cushions
Two ligaments (ergot lig) extend cranial distally and feed into digital fascia
Clinical significance of ergot ligaments
Can cut nerve supply - medial and plantar digital n
Can be mistaken for nerves, ligs are superficial to nerves
(Have shiny silvery appearance)
Hamstring muscles in horses
Biceps femoris (3head, patellar, tibial, )
Semi tendinous and membranous
Each muscle has two heads of origin : vertebral & pelvic head
Vertebral heads origin
Sacrum, sacrotuberus lig, caudal vertebra
Innervation of vertebral heads on hamstring muscles
Caudal gluteal n
Origin of pelvic heads of hamstring
Ischial tuber
Innervation of pelvic heads of hamstring
Sciatic nerve
Trochanteric bursitis
Located deep to tendon of insertion of MGlute & cranial part of greater trochanter
- could be secondary to problems in the hock
Fasciae planes & Compartmental syndrome progression
Pressure & compression on deep fascia sheath
Thin walls collapse
Blood continues flow in arteries
Muscle swells within fasciae sheath
Muscle anoxia & necrosis
When does compartmental syndrome occur
When animal is in lateral recumbancy
Areas deep fascia restrict blood flow to
Gluteal muscles
Antebrachial muscles (radial paralysis)
Masseter
Ways to avoid compartment syndrome
Massaging glutes, antebrachial & masseter muscles during surgery
Sublumbar muscle group
Psoas minor & major
Iliacus
Iliopsoas - strong flexor of hip jt
Quadratus lumborum - ventral to transverse process of lumbar vertebrae
Lameness due to Sublumbar muscle
Iliopsoas can cause lameness in horse, diagnose by palpating muscle rectally & eliciting signs of pain
Muscles of crus
Long digital extensor - ext digits, flexes hock
Lateral digital extensor
Short digital extensor
Extensor retinacula contain
Proximal extensor retinaculum (crural/tibial)
Middle extensor retinaculum (tarsal)
Distal extensor retinaculum (MT)
Tenectomy procedure for stringhalt
2 cutes
1 - proximal @ musculo-tendinous junction of lateral digital extensor
2 - prior to union with long digital extensor tendon
Reciprocal apparatus
Includes SDF and Peroneus tertius between the stifle/hock
Prevents stifle flexion & simultaneous ext of hock
Cunean tendon
Medial branch of the cranial tibial muscle
Important for relieving OA in area or bursitis or bone spavin
Location of subtenditious calcanean bursa
Within the SDF muscle
Calcanean bursae
Sub tendinous bursa - constant between gastroc & SDF
Subcutaneous bursa - induced, inflammed= capped hock
Pouches of talocrural synovial sac
Large Dorso medial pouch - easily punctured = bogus spavin
Medio-plantar & latero-plantar pouches
Thoroughpin
Inflammation/distension of synovial sheath of DDFT
Structures within tarsal canal
DDFT
Medial plantar VAN
Lateral plantar VAN
Pelvic limb arteries - equine
External iliac
Femoral - saphenous a
Popliteal
< caudal tibial
< cranial tibial - dorsal pedal - dorsal metatarsal III
How arteries travel on Eq
Laterally instead of deep and medially
Main arteries in equine pes
Dorsal pedal - perforating tarsal - anatomoses saphenous -
< great MT & med & lat plantar /MT
- medial & lateral plantar digital a
Veins in pelvic limb
Deep veins parallel arteries w same name
Medial saph vein crosses cunean tendon
Fibular nerve path
Sciatic
Fibular - lateral cutaneous sural
< superficial branch - LDF
< deep branch - med & lat dorsal MT
Tibial nerve path
Sciatic
Tibial -> incoming caudomedial mm of Crus
<medial plantar - medial plantar digital
<lateral plantar - lateral plantar digital <deep branch - med & lat plantar MT
Nerve supply for proximal muscles
Vert heads of hamstring - caudal gluteal
PAGE - obturator
Quadriceps femoris - femoral
Sartorius - saphenous
Skin - ^^
What nerve supplies a singular muscle ?
Superficial peroneal nerve supplies the lateral digital extensor muscle
Tibial nerve
Runs between calcanean tendon & DDFT (medial aspect)
Innervates caudal crural mm < into med & lat plantar
Medial and lateral plantar nerves
Pass through tarsal canal, run in the groove between flexor tendon & suspensory ligament
Communicating branch between med & lat branch can be absent