Revision: hip and thigh muscles Flashcards
anterior flexor muscles of thigh and innervation
iliopsoas: psoas M., iliacus
sartorius, pectineus
all by femoral nerve apart from psoas M which is innervated by anterior rami of lumbar nerves
pectineus innervation and action
femoral nerve
adducts and flexes thigh
iliopsoas parts, innervation and action
psoas major: anterior rami of lumbar nerves
iliacus: femoral nerve
both flex thigh at hip and stabilise hip joint
sartorius innervation, action
femoral nerve
flexes, abducts, laterally rotates thigh
also, as it inserts into the sup. med. surface of tibia (it is the longest muscle in the body), it also flexes the leg at the knee joint
anterior thigh extensor leg muscles action, innervation
quadricep muscles: -vastus medialis, intermedius and lateralis
-rectus femoris
all extend leg at knee, insert into quadriceps tendon to base of patella (also indirectly via patellar ligament to tibial tuberosity) and are innervated by the femoral nerve
the rectus femoris is unique of the four as it also crosses the hip joint, so it stabilises the hip as well as assisting the iliopsoas in flexion of the thigh
[in the picture, vastus intermedius is deep to the rectus femoris]
medial (adductor) muscles of the thigh, innervation
Adductor: longus, brevis, magnus
obturator externus
gracilis
all by obturator nerve apart from hamsrting part of adductor magnus (innervated by sciatic nerve)
[in picture, gracilis is located on top of adductor magnus]
Adductor longus innervation and action
obturator nerve
adducts thigh
adductor brevis innervation and action
obturator nerve
adducts and to some extent flexes thigh
adductor magnus innervation and action
adductor head: obturator nerve, hamstring head: sciatic nerve
action: adducts thigh; adductor part flexes thigh; hamsrting part extends thigh
between the two parts is a gap - the adductor hiatus - that allows through the femoral artery and vein from the adductor canal to the popliteal fossa
gracilis innervation and action
obturator nerve
adducts thigh, med rotates and flexes leg
obturator externus innervation and action
obturator nerve
laterally rotates thigh, stabilises head of femur in acetabulum
posterior thigh muscles, their general action and innervation
semimembranosus, semitendinosus, biceps femoris
extensors of hip and flexors of knee
first two by tibial division of sciatic nerve, latter- short head (common fibular) and long head (tibial division)
semimembranosus innervation and action
tibial division of sciatic nerve
extends thigh; flexes leg and med. rotates leg when flexed; when leg and thigh are flexed it can extend the trunk (all are shared by semitendinosus, first two by biceps femoris)
[in picture, a lot of the semimembranosus is hidden by the semitendinosus]
semitendinosus innervation and action
tibial division of sciatic nerve
extends thigh; flexes leg and med. rotates leg when it is flexed; when leg and thigh are flexed it can also extend the trunk (these functions are all shared with the semimembranosus, and the first two by the biceps femoris)
biceps femoris innervation and action
(long head) tibial division of sciatic nerve, (short head) common fibular nerve
extends thigh; felxes leg and med. rotates leg when it is flexed (these functions it shares with the semi- tendinosus and membranosus)
[in picture the short head is on the right and long head on the left]
what is this muscle and what is its innervation?
biceps femoris, long head on left and short on right
sciatic nerve
muscle and innervation?
semitendinosus, sciatic nerve
muscle and innervation
semimembranosus, sciatic nerve
name these muscles, which is the compartment and what is the other (and where is it located?)
anterior extensors of knee
vastus intermedius, underneath the rectus femoris
name these muscles, what is the compartment, what is the other muscle, where is it located?
adductor muscles of thigh
gracilis, above the inferior part of adductor magnus
muscles of gluteal region, general actions and innervation
gluteus: maximus, medius, minimus, tensor fasciae latae, obturator internus, sup and inf gemelli, piriformis
adductors and rotators of thigh
g. max. by inf. gluteal nerve, g. min, med and TFL by sup. gluteal nerve, piriformis by nerve to piriformis, inf. gemelli and quad. femoris by nerve to quad femoris, sup. gemelli and obturator internus by nerve to obturator internus
gluteus maximus innervation and action
inf. gluteal nerve
extends, steadies and assists in lat. rotation of thigh, also assists when rising from a sitting position
gluteus minimus and medius innervation and action
sup. gluteal nerve
abduct and med. rotate thigh, keeps pelvis horizontal when opposite limb is weight bearing (raised)
both innervation and action are identical to the tensor fasciae latae
tensor fasciae latae innervation and action
superior gluteal nerve
abduct and med. rotate thigh, keep hip horizontal when opposite limb is weight bearing
both inn. and act. are identical to gluteus medius and minimus
