PL Origins, Insertions and Actions Flashcards
semitendinosus
Origin
ischiatic tuberosity
Insertion
medial surface of tibial body
tuber calcanei via common calcanean tendon
Action
extend hip; flex stifle; extend hock
semimembranosus
Origin
isciatic tuberosity
Insertion
distal and medial aspect of the caudal femur and medial condyle of the tibia
Action
extend hip
extend or flex stifle depending on limb position
sartorius
Origin
crest of ilium & thoracolumbar fascia
ventral border of ilium
Insertion
patella and cranial border of tibia
Action
flex hip; extend stifle (weight bearing);
flex stifle (not weight bearing)
gracilis
Origin
pelvic symphysis via symphysial tendon
Insertion
cranial border of tibia;
tuber calcanei via common calcanean tendon
Action
adduct limb; flex stifle; extend hip and hock
pectineus
Origin
pubis (pre-pubic tendon and iliopubic eminence)
Insertion
distal end of caudomedial aspect of femur
(medial lip of caudal rough surface)
Action
adduct limb
adductor
(magnus et brevis and longus)
Origin
pelvic symphysis via symphysial tendon
ventral surface of pubis and ischium
Insertion
caudolateral aspect of femur
(entire lateral lip of caudal rough surface of femur)
Action
adduct limb; extend hip
tensor fasciae latae
Origin
tuber coxae; aponeurosis of middle gluteal m.
Insertion
lateral femoral fascia, a.k.a. fascia lata
Action
tense fascia lata; flex hip; extend stifle
superficial gluteal
Origin
sacrotuberous ligament; deep gluteal fascia
Insertion
third trochanter of the femur
Action
extend hip; abduct limb
middle gluteal
Origin
crest and gluteal surface of ilium
Insertion
greater trochanter of the femur
Action
extend hip; abduct hip; rotate pelvic limb medially
deep gluteal
Origin
body of ilium; ischiatic spine
Insertion
greater trochanter of the femur
Action
extend hip; abduct hip; rotate pelvic limb medially
internal obturator
Origin
dorsal surface of ischium and pubis
dorsal pelvic symphysis
Insertion
trochanteric fossa of the femur
Action
rotate pelvic limb laterally
gemelli
Origin
lateral surface of ischium, ventral to the lesser ischiatic notch
Insertion
trochanteric fossa of the femur
Action
rotate pelvic limb laterally
quadratus femoris
Origin
ventral surface of caudal ischium
Insertion
intertrochanteric crest of the femur
Action
rotate pelvic limb laterally; extend hip
external obturator
Origin
ventral surface of pubis and ischium
Insertion
trochanteric fossa of the femur
Action
rotate pelvic limb laterally
quadriceps femoris
Origin
ilium (rectus femoris); proximal aspect of femur
Insertion
tibial tuberosity via the patellar ligament
Action
flex hip (rectus femoris); extend stifle (all heads)
iliopsoas
Origin
ventral aspect of lumbar vertebrae; cranioventral ilium
Insertion
lesser trochanter of the femur
Action
flex hip
cranial tibial
Origin
proximal and lateral aspect of the tibia near the extensor groove
Insertion
proximal plantar surface of metatarsals I and II
Action
flex tarsus; rotate paw laterally so plantar surface faces medially
fibularis longus
Origin
lateral collateral ligament; proximal aspect of tibia and fibula
Insertion
tarsal bone IV; plantar aspect of proximal ends of metatarsals
Action
flex tarsus; rotate paw medially so plantar surface faces laterally
gastrocnemius
Origin
medial and lateral supracondylar tuberosities of the femur
Insertion
tuber calcanei
Action
extend tarsus; flex stifle
superficial digital flexor
Origin
lateral supracondylar tuberosity of the femur (in common with with lateral head of the gastrocnemius m.)
Insertion
tuber calcanei; plantar aspect of the base of the middle phalanx of digits II, III, IV, and V
Action
flex stifle; extend tarsus; flex digits
deep digital flexor
Origin
proximal tibia and fibula and adjacent interosseus membrane between the two
Insertion
plantar aspect of the base of the distal phalanx of digits I - V
Action
flex digits; extend tarsus
popliteus
Origin
lateral condyle of femur
Insertion
proximal and caudal aspect of the tibia
Action
flex stifle; rotate leg (crus) medially
long ditital extensor
Origin
extensor fossa of the femur
Insertion
extensor processes of distal phalanges digits II, III, IV, and V.
Action
extend digits; flex tarsus
biceps femoris
Origin
sacrotuberous ligament & ischiatic tuberosity
Insertion
patella, patellar lig., & cranial border of tibia via fascia lata and crural fascia; tuber calcanei via common calcanean tendon
Action
extend hip, stifle, & hock; can flex stifle when not bearing weight
