chapter 18 knee muscles Flashcards
the origin, insertion, action of vastus lateralis
O: Linea aspera
I: Tibial tuberosity via patellar tendon
A: Knee extension
the origin, insertion, action of vastus medalis
O: Linea aspera
I: Tibial tuberosity via patellar tendon
A: Knee extension
the origin, insertion, action of vastus intermedialis
O: Anterior femur
I: Tibial tuberosity via patellar tendon
A: Knee extension
the origin, insertion, action of biceps femoris
O: Long head: Ischial tuberosity;
Short head: lateral lip of linea aspera
I: Fibular head
A: Long head: Extend hip, flex knee;
Short head: Flex knee
the origin, insertion, action of semitendinosus
O: Ischial tuberosity
I: Anteromedial surface of proximal tibia
A: Extend hip, flex knee
the origin, insertion, action of semimembranosus
O: Ischial tuberosity
I: Posterior surface of
medial condyle of tibia
A: Extend hip, flex knee
the origin, insertion, action of gastrocnemius
O: Medial and lateral condyles of femur
I: Posterior calcaneus
A: Knee flexion, ankle plantar flexor
the origin, insertion, action of popliteus
O: Lateral condyle of femur
I: Posteriorly on medial condyle of tibia
A: Initiates knee flexion
which muscles has Tibial nerves
gastrocnemius s1,s2
popliteaus l4,l5,s1
which muscles has femoral nerve
Rectus Femoris,
Vastus Lateralis,
Vastus Medialis l2,l3,l4
Vastus Intermedialis
which muscles has sciatic nerve
Semitendinosus
Biceps Femoris- short=Sciatic nerve , long= Common peroneal nerve
Semimembranosus
Contributes to lateral stability
tenso fascia latae
Contribute to medial stability
Gracilis and sartorius
Medial and lateral stability
Gastrocnemius and hamstrings
Anterior stabilizer
quadriceps
Gracilis, sartorius, and tensor fascia latae what are they main function
span knee posteriorly
Provide stability to the knee
Do not have a prime-mover function
Size Angle of pull
With nonfunctioning quadriceps, stance is possible by
gluteus maximus and gastrocnemius action
In weight-bearing position, the two muscle contract, pulling the knee into extension
what are the five muscles that help with knee extension of the gastrocnemius
Q - Quadriceps
T -Tensor fascia latae
GL- Gluteus maximus
G- Gastrocnemius
S- Soleus
define the ACL function
prevents displacement of anterior tibia on femur, posterior displacement of femur on tibia
what muscles anterior is single joint
the vastus muscles lateralis, medialis, intermedialis
what muscle anterior is multi joint
rectus femoris
which muscles posterior is single joint
biceps femoris short head, popliteus
which posterior muscles are multi joint
hamstrings, gracilis, sartorius, gastrocnemius, planteris, biceps femoris long head,
the origin, insertion, action of tensor fascia latae
o; asis, I; iliotibial band to lateral condyle of tibia, a; abduction, hip flexion
