anatomy - muscles of thigh and stifle

Question 1

what is the origin, insertion, action and innervation of the biceps femoris muscle

Answer 1

* origin: sacrotuberous ligament and ischiatic tuberosity
* insertion: fascia lata and fascia of the leg to patella, patellar ligament, tibial crest and body, tuber calcanei
* action: extension of hip, stifle, tarsal joints; flexion of stifle (caudal parts of muscle)
* innervation: sciatic nerve

Question 2

what is the origin, insertion, action and innervation of the semitendinous muscle

Answer 2

* origin: ischiatic tuberosity
* insertion: distocranial border of tibia. medial surface of body of tibia and tuber calcanei by means of crural fascia
* action: extend hip joint, flex stifle, and extend tarsal joints
* innervation: sciatic nerve

Question 3

what is the origin, insertion, action and innervation of the semimembranosus muscle

Answer 3

* origin: ischiatic tuberosity
* insertion: distal medial lip of caudal femur and medial condyle of tibia
* action: extension of hip, flexion and extension of stifle
* innervation: sciatic nerve

Question 4

what is the origin, insertion, action and innervation of the gracialis muscle

Answer 4

* origin: pelvic symphysis
* insertion: cranial border of the tibia and tuber calcanei
* action: adduction of limb, flexion of stifle, extension of hip and hock
* innervation: obturator nerve

Question 5

what is the origin, insertion, action and innervation of the adductor muscle

Answer 5

• origin: pelvic symphysis, ventral parts of pubis and ischium
• insertion: lateral lip of caudal femur
• action: adduction of limb and extension of hip
• innervation: obturator nerve

Question 6

what is the origin, insertion, action and innervation of the sartorius muscle

Answer 6

* origin: Cranial—crest of ilium and thoracolumbar fascia
Caudal—iliac spine and ventral border of ilium
* insertion: Cranial—patella
Caudal—cranial border of tibia
* action: hip flexion; cranial part extends stifle; caudal part flexes stifle
* innervation: femoral nerve

Question 7

what is the origin, insertion, action and innervation of the tensor fasciae latae muscle

Answer 7

* origin: tuber coxae, aponeurosis of middle gluteal m
* insertion: lateral femoral fascia
* action: flexion of hip, extension of stifle
* innervation: cranial gluteal nerve

Question 8

what is the origin, insertion, action and innervation of the quadricepts femoris - rectus femoris

Answer 8

• origin: ilium
• insertion: tibial tuberosity
• action: flex hip joint, extend stifle
• innervation: femoral nerve

Question 9

what is the origin, insertion, action and innervation of the quadriceps femoris - vastus lateralis muscle

Answer 9

* origin: proximal femur
* insertion: tibial tuberosity
* action: extend stifle
* innervation: femoral nerve

Question 10

what is the origin, insertion, action and innervation of the quadriceps femoris - vastus medialis

Answer 10

• origin: proximal femur
• insertion: tibial tuberosity
• action: extend stifle
• innervation: femoral nerve

Question 11

what is the origin, insertion, action and innervation of the iliopsoas muscle

Answer 11

• origin: psoas major - lumbar vertebrae; iliacus - cranioventral ilium
• insertion: lesser trochanter
• action: flex hip joint
• innervation: ventral branches of lumbar spinal nerves, femoral nerve