Origin, Insertion, Action and Innervations of the Equine PL
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| Origin of the Iliopsoas | Ventral surface of bodies and transverse processes of lumbar vertebrae.
Ventral surface of wing and body of Ilium
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| Insertion of the Iliopsoas | Lesser trochanter of the femur
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| Action of the Iliopsoas | Flex Hip
Rotate Thigh
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| Innervation of the Iliopsoas | Ventral branches of lumbar nerves
Femoral nerve
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| Origin of the Tensor Fascia Latae | Coxal Tuber
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| Insertion of the Tensor Fascia Latae | Lateral Patellar Ligament
Cranial Border of Tibia
Patella via fascia lata
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| Action of the Tensor Fascia Latae | Flex Hip
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| Innervation of the Tensor Fascia Latae | Cranial Gluteal Nerve
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| Origin of the Superficial Gluteal | Coxal tuber
Gluteal fascia
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| Insertion of the Superficial Gluteal | Third trochanter
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| Action of the Superficial Gluteal | Flex Hip
Abduct Thigh
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| Innervation of the Superficial Gluteal | Cranial Gluteal Nerve
Caudal Gluteal Nerve
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| Origin of the Middle Gluteal | Coxal tuber
Iliac wing
Sacrum
Sacrosciatic Ligament
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| Insertion of the Middle Gluteal | Greater trochanter (Caudal)
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| Action of the Middle Gluteal | Extend Hip
Abduct Thigh
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| Innervation of the Middle Gluteal | Cranial Gluteal Nerve
Caudal Gluteal Nerve
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| Origin of the Deep Gluteal | Ischiatic Spine
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| Insertion of the Deep Gluteal | Greater trochanter (cranial)
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| Action of the Deep Gluteal | Abduct thigh
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| Innervation of the Deep Gluteal | Cranial Gluteal Nerve
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| Origin of the Biceps Femoris | Sacrum
Sacrosciatic Ligament
Ischiatic Tuberosity
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| Insertion of the Biceps Femoris | 1) Fascia lata and Patella
2) Lateral Patellar Ligament and Tibial Crest
3) Calcanean Tuber
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| Action of the Biceps Femoris | Extend Hip
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| Innervation of the Biceps Femoris | Caudal Gluteal Nerve
Sciatic Nerve
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| Origin of the Semitendinosis | T-processes of Caudal Vertebrae
Ventral Surface of Ischiatic Tuberosity
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| Insertion of the Semitendinosis | Medial aspect of the distal end of the crest of Tibia
Calcanean Tuber
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| Action of the Semitendinosis | Extend Hip
Extend Hock
Flex Stifle
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| Innervation of the Semitendinosis | Caudal Gluteal Nerve
Sciatic Nerve
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| Origin of the Semimembranosis | Sacrotuberous Ligament
Ventral Surface of the Ischiatic Tuberosity
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| Insertion of the Semimembranosis | Medial Epicondyle of the Femur
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| Action of the Semimembranosis | Extend Hip
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| Innervation of the Semimembranosis | Sciatic Nerve
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| Origin of the Gracilis | Pelvic Symphysis
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| Insertion of the Gracilis | Medial Patellar Ligament
Medial Surface of Tibia
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| Action of the Gracilis | Adduct Limb
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| Innervation of the Gracilis | Obturator Nerve
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| Origin of the Sartorius | Iliac Fascia
Tendon of the psoas minor
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| Insertion of the Sartorius | Medial Patellar Ligament
Tibial Tuberosity
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| Action of the Sartorius | Flex Hip
Adduct Limb
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| Innervation of Sartorius | Saphenous Nerve
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| Origin of the Pectineus | Cranial Border of Pubis
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| Insertion of the Pectineus | Medial Border of Femur
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| Action of the Pectineus | Flex Hip
Adduct Limb
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| Innervation of the Pectineus | Obturator Nerve
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| Origin of the Adductor | Ventral Surface of Pubis and Ischium
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| Insertion of the Adductor | Caudal Surface and Medial Epicondyle of Femur
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| Action of the Adductor | Adduct Thigh
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| Innervation of the Adductor | Obturactor Nerve
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| Origin of the Vastus Medialis | Medial Surface of Femur
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| Insertion of the Vastus Medialis | Patella
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| Action of the Vastus Medialis | Extend Stifle
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| Innervation of the Vastus Medialis | Femoral Nerve
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| Origin of the Vastus Intermedius | Cranial Surface of Femur
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| Insertion of the Vastus Intermedius | Patella
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| Action of the Vastus Intermedius | Extend Stifle
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| Innervation of the Vastus Intermedius | Femoral Nerve
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| Origin of the Vastus Lateralis | Lateral Border of Femur
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| Insertion of the Vastus Lateralis | Patella
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| Action of the Vastus Lateralis | Extend Stifle
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| Innervation of the Vastus Lateralis | Femoral Nerve
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| Origin of the Rectus Femoris | Body of the Ilium
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| Insertion of the Rectus Femoris | Patella
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| Action of the Rectus Femoris | Extend Stifle
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| Innervation of the Rectus Femoris | Femoral Nerve
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| Origin of the Tibialis Cranialis | Lateral Condyle of Tibia
Tibial Tuberosity
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| Insertion of the Tibialis Cranialis | 1) Medial Branch = T1+T2
2) Dorsal Branch = T3+MT3
3) Lateral Branch = T4
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| Action of the Tibialis Cranialis | Flex Tarsus
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| Innervation of the Tibialis Cranialis | Peroneal Nerve
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| Origin of the Peroneus Tertius | Extensor fossa of the Femur
(in common with the long digital extensor)
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| Insertion of the Peroneus Tertius | 1) Dorsal Branch = T3 + MT3
2) Lateral Branch = Calcaneus + T4
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| Action of the Peroneus Tertius | Links the actions of the Stifle and Taral Joints
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| Innervation of the Peroneus Tertius | No contractile function
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| Origin of the Long Digital Extensor | Extensor Fossa of the Femur
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| Insertion of the Long Digital Extensor | Extensor process of P3
Dorsoproximal aspects of P1 and P2
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| Action of the Long Digital Extensor | Flex Tarsus
Extend Stifle
Extend Digits
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| Innervation of the Long Digital Extensor | Deep Peroneal Nerve
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| Origin of the Lateral Digital Extensor | Lateral collateral ligament of stifle
Lateral Condyle of Tibia
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| Insertional of the Lateral Digital Extensor | Proximal third of Metatarsus
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| Action of the Lateral Digital Extensor | Flex Tarsus
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| Innervation of the Lateral Digital Extensor | Superficial Peroneal Nerve
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| Origin of the Popliteus | Lateral Epicondyle of Femur
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| Insertion of the Popliteus | Caudomedial Border of Tibia
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| Action of the Popliteus | Flex Stifle
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| Innervation of the Popliteus | Tibial Nerve
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| Origin of the Gastrocnemius | Lateral Head: lateral supracondylar tuberosity of Femur
Medial Head: medial supracondylar tuberosity of Femur
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| Insertion of the Gastrocnemius | Calcanean Tuberosity
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| Action of the Gastrocnemius | Extend Tarsus
Flex Stifle
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| Innervation of the Gastrocnemius | Tibial Nerve
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| Origin of the Superficial Digital Flexor | Supracondylar Fossa of Femur
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| Insertion of the Superficial Digital Flexor | Lateral and Medial aspects of the distal end of P1
Lateral and Medial aspects of proximal end of P2
Calcaneous
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| Action of the Superficial Digital Flexor | Flex Digits
Extend Tarsus
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| Innervation of the Superficial Digital Flexor | Tibial Nerve
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| Origin of the Deep Digital Flexor | Caudal aspect of the Tibia
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| Insertion of the Deep Digital Flexor | Plantar Surface of distal Phalanx
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| Action of the Deep Digital Flexor | Flex Digits
Extend Tarsus
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| Innervation of the Deep Digital Flexor | Tibial Nerve
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| Origin of the Interosseus | Plantar surface of distal row of tarsal bones
Proximal plantar surface of MT3
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| Insertion of the Interosseus | Proximal sesamoid bones
Long extensor tendons
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| Action of the Interosseus | Prevent over extension of fetlock joint
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