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11 Cards in this Set
- Front
- Back
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Where do the extensors of the hip arise from on the pelvis?
Where do the extensors of the hip insert? |
All arise from the ishial tuberosity
forms ligaments which attach to the knee joint |
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What are the extensors of the hip? |
Biceps femoris
Semimembranosus
semitendonosus |
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Biceps femoris
Names the two origins and two insertions of the biceps femoris
What is the nerve supply to the biceps femoris |
2 heads:
Long head - ishial tuberosity
Short head - whole length of linea aspera and supracondylar line
Joins together and forms tendon to fit on head of fibula
Common fibular L5, S1,S2 |
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What is the origin and insertion of the Semimembranosus
What is the nerve supply to the semimembranosus? |
top of ishial tuberosity - back of tibia, medially and posterior to epicondyle
Tibial nerve L5, S1, S2 |
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Where is the Semimtendinosus located?
What is the origin and insertion of the semitendinosus? |
Lies behind semimembranosus
cord like tendon
next to semimbranosus (medially) - medial aspect of tibia.
next to gracillus, and sartorius (goose foot) |
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What are the actions of the semitendinosus?
What are the actions of the biceps femoris? |
extends thigh, knee and rotates it medially when knee is flexed.
knee flexion
extends hip and flexes the knee
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What is the Gluteus Maximus
Where is the gluteus maximus found?
what is its origin?
What is its insertion? |
thick flat sheet muscle
arises from top of ilium, side of sacrum and sacrotuberous ligament
inserts 3/4 into illiotibial tract 1/4 lower quadrant into gluteal tuberosity |
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What are the actions of the gluteus maximus? |
Powerful action Opposes the force of gravity
extends hip from an area of flexion
e.g climbing stairs
pulls back of pelvis (from bending to upright) and does the other way. |
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Why are the extensors important when considering the hip? |
Stabilise th pelvis in the anteroposterior direction. (extensors pull the back of the leg)
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What happens when your pelvis is tilted anteriorly? |
centre of gravity lies in the front of the transverse axis of the hip
hamstring muscles contract to straighten the pelvis
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What happens if you bend fowards very far? |
hamstrings are the first to contract.
The gluteus maximus contracts powerfully as well as hamstrings.
More efficient if there is a greater degree of knee extension. |
