Anatomy Dissection 3 Flashcards
What does the sciatic nerve (L4 - S3) supply?
Muscles in the posterior compartment of thigh, muscles within all compartments of leg and intrinsic muscles of foot
What does the sciatic nerve divide into?
Tibial and common fibular nerve
Where does the sciatic nerve tend to divide?
Anywhere between gluteal region and popliteal fossa (most commonly inferior 1/3rd of thigh)
Where do three of the four hamstring muscles attach to proximally?
Ischial tuberosity
What are the three individual hamstring muscles?
- Semimembranosus
- Semitendinosus (medially)
- Biceps femoris (laterally)
What function do the hamstring muscles have?
Extend and flex these knee and hip joints
What bounds the popliteal fossa superomedially and superolaterally?
Tendons of hamstrings
What does the biceps femoris attach to?
The lateral aspect of the head of fibula
Give three reasons why the short head of the biceps cannot be considered a ‘true’ hamstring?
- It attaches proximally to the linea aspera of femur, not ischial tuberosity
- Does not cross the hip joint and so does not contribute to hip joint movement
- Is supplied by common fibular branch of sciatic nerve not the tibial
Where do the semimembranosus and semitendinosus attach to?
The proximal tibia
Why is the name given to the semitendinosus?
It has a longer tendon than the other muscles
Why is the name given to the semimembranosus?
It has shiny membranous appearance
What increases the depth of the acetabulum?
The acetabular labrum
What attaches the femur to the depth of acetabulum and is ruptured during dislocation?
Ligament of the head of femur
What artery supplies minimal blood to the head of femur and is obliterated in adulthood?
Artery to head of femur
