Knee Musculature Flashcards
What muscles execute Knee flexion
8 Muscles biceps femoris semitendinosus semimembranosus gracilis sartorius gastrocnemius popliteus plantaris
What muscles execute Knee extension
4 Muscles, Quadriceps Group vastusgroup -medialis -lateralis -intermedius rectus femoris
What muscles ER the tibia
biceps femoris
The bony anatomy aids in ER as knee moves into extension
What muscles IR the tibia
5 Muscles popliteal semitendinosus semimembranosus sartorius gracilis IR is limited & can only occur in knee flexion
What muscle on the lateral side primarily functions as a dynamic later stabilizer?
Iliotibial band
Sartorius
Origin, Insertion, Muscle Action, & Innervation
O: Ant Sup iliac spine
I: Prox Med surface of tibia, below tuberosity
MA: Knee flexion, IR
INN: Femoral (L2, L3, L4)
Quadriceps Femoris: Rectus Femoris
Origin, Insertion, Muscle Action, & Innervation
O: Ant Inf iliac spine, above acetabulum of os coxae
I: Tibial tuberosity via patella & patellar ligament
MA: Knee extension
INN: Femoral (L2,L3,L4)
Quadriceps Femoris: Vastus Lateralis
Origin, Insertion, Muscle Action, & Innervation
O: Greater trochanter, lat lip of linea aspera
I: Tibial tuberosity via patella & patellar ligament
MA: Knee Extension
INN: Femoral (L2,L3,L4)
Quadriceps Femoris: Vastus Medialis
Origin, Insertion, Muscle Action, & Innervation
O: Medial lip of linea aspera
I: Tibial tuberosity via patella & patellar ligaments
MA: Knee Extension
INN: Femoral (L2,L3,L4)
Quadriceps Femoris: Vastus Intermedius
Origin, Insertion, Muscle Action, & Innervation
O: Ant surface of shaft of femur
I: Tibial tuberosity via patella & patellar ligaments
MA: Knee extension
INN: Femoral (L2,L3,L4)
Hamstrings: Biceps Femoris
Origin, Insertion, Muscle Action, & Innervation
LH O: Ischial tuberosity I: Lateral suface of head of Fibula & lat tibial condyle MA: Knee flexion, ER INN: Sciatic (L5,S1,S2) SH O: Lat lip of linea aspera I: " " MA: " " INN: " "
Hamstrings: Semitendinosus
Origin, Insertion, Muscle Action, & Innervation
O: Ischial tuberosity
I: Med surface of prox end tibia
MA: knee flexion, IR
INN: Tibial (S1,S2)
Hamstrings: Semimembranosus
Origin, Insertion, Muscle Action, & Innervation
O: Ischial tuberosity
I: Med surface of prox end tibia
MA: Knee flexion, IR
INN: Tibial (S1,S2)
Poplitieus
Origin, Insertion, Muscle Action, & Innervation
O: Lat condyle of femur
I: Post surface of tibia below tibial plateau
MA: Knee flexion, IR
INN: Tibial (L4,L5,S1)
Gastrocnemius
Origin, Insertion, Muscle Action, & Innervation
LH O: Post lat condyle of femur I: Post surface of calcaneous MA: Knee flexion INN: Tibial (S1,S2) SH O: Popliteal surface of femur above medial condyle I: " " MA: " " INN: " "
