Muscles Flashcards
Common features of the hamstring group
They all flex the knee, extend the hip and posteriorly tilt the pelvis.
Muscles of the hamstring group
Biceps femoris, semimembranosus, semitendinosus
Origin of the biceps femoris
Long head originates on the ischial tuberosity and the short head on the lateral lip of the linea aspera.
Insertion of the biceps femoris
Head of the fibula
Actions of the biceps femoris
Flex the knee, extend the hip, posteriorly tilt the pelvis, laterally rotate the flexed knee and laterally rotate the hip.
Innervation of the biceps femoris
Sciatic nerve. The tibial branch for the long head and the fibular branch for the short head.
Palpation key for biceps femoris
Client is prone and resist flexion of the leg and extension of the thigh for the long head.
The knee flexes at the ______ joint.
Tibiofemoral.
The hip extends at the _____ joint.
Coxal.
The pelvis tilts at the _____ joint.
Lumbosacral
Semitendinosus origin
Ischial tuberosity
Semitendinosus insertion
Proximal medial shaft of the tibia at the pes anserinus tendon.
Semitendinosus actions
Flex the knee, extend the hip, posteriorly tilt the pelvis, medially rotate the hip and medially rotate the flexed knee.
Innervation of semitendinosus
Tibial branch of the sciatic nerve.
Semitendinosus palpation key
Client prone, resist flexion of the leg at the knee.
Semimembranosus origin
Ischial tuberosity
Semimembranosus insertion
Posterior aspect of the medial condyle of the tibia
Actions of semimembranosus
Flex the knee, extend the hip, posteriorly tilt the pelvis, medially rotate the hip, medially rotate the flexed knee.
Innervation of semimembranosus
Tibial branch of the sciatic nerve.
Palpation key of semimembranosus
Client prone, resist flexion of the leg and palpate on either side of semitendinosus.
Common features of quadriceps femoris group
All extend the knee, insert at the tibial tuberosity and are innervated by the femoral nerve.
Muscles of the quadriceps femoris group
Rectus femoris, vastus intermedius, vastus lateralis, vastus medialis.
Origin of rectus femoris
Anterior inferior iliac spine (AIIS)
Insertion of rectus femoris
Tibial tuberosity via the patellar tendon
Actions of the rectus femoris
Extend the knee at the tibiofemoral joint and flexes the hip at the coxal joint.
Innervation of the rectus femoris
Femoral nerve
Palpation key of the rectus femoris
Client supine with legs dangling; resist extension of the knee for the lower fibers and flexion of the thigh for upper fibers.
Origin of vastus intermedius
Anterior and lateral shaft of the femur
Insertion of the rectus femoris
Tibial tuberosity via the patellar tendon.
Action of the vastus intermedius
Extends the knee at the tibiofemoral joint.
Innervation of the vastus intermedius
Femoral nerve
Palpation key of vastus intermedius
Client supine with legs dangling; resist extension of the leg.
Origin of vastus medialis
Medial lip of the linea aspera
Insertion of vastus medialis
Tibial tuberosity via the patellar tendon.
Action of the vastus medialis
Extend the knee at the tibiofemoral joint.
Innervation of the vastus medialis
Femoral nerve.
Palpation key of the vastus medialis
Client supine with legs dangling; resist extension of the leg.
Origin of vastus lateralis
Lateral lip of the linea aspera.
Insertion of vastus lateralis
Tibial tuberosity via the patellar tendon
Action of vastus lateralis
Extend the knee at the tibiofemoral joint.
Innervation of vastus lateralis
Femoral nerve
Palpation key of vastus lateralis
Client supine with legs dangling; resist extension of the leg.
Origin of the gluteus maximus
Coccyx, edge of the sacrum, posterior iliac crest and sacroiliac and sacrotuberous ligaments.
Insertion of the gluteus maximus
Upper fibers insert to the iliotibial tract and the lower fibers to the gluteal tuberosity.
Actions of the gluteus maximus
Extends, laterally rotates and abducts the hip. Lower fibers also adduct the hip.
Innervation of the gluteus maximus
Inferior gluteal nerve.
Palpation key of the gluteus maximus
Client prone, resist extension of the thigh with the leg rotated laterally.
Origin of the gluteus medius
Lateral ilium, just below the iliac crest between the gluteal lines.
Insertion of the gluteus medius
Lateral aspect of the greater trochanter.
Actions of the gluteus medius
Abduct the hip, the posterior fibers extend and laterally rotate the hip and the anterior fibers flex and medially rotate the hip.
Innervation of gluteus medius
Superior gluteal nerve
Palpation key of gluteus medius
Client side-lying, resist adduction of the thigh. Medial fibers can add medial rotation and the posterior fibers lateral rotation.
Origin of tensor fascia latae
Iliac crest posterior to the ASIS
Insertion of tensor fascia latae
Iliotibial tract.
Actions of tensor fascia latae
Flexes, abducts and medially rotates the hip at the coxal joint.
Innervation of tensor fascia latae
Superior gluteal nerve
Palpation key of tensor fascia latae
Client supine, place the leg into medial rotation and resist flexion of the thigh.
Origin of adductor longus
Pubic tubercle
Insertion of adductor longus
Pectineal line and the medial lip of the linea aspera
Actions of adductor longus
Adducts, medially rotates and assists to flex the hip at the coxal joint.
Innervation of adductor longus
Obturator nerve
Palpation key of adductor longus
Client supine with leg dangling over the side; have client press leg against table.
Muscles that flex the hip
Tensor fascia latae, rectus femoris, gluteus medius (anterior fibers), adductor longus (assists)
Muscles that extend the hip
Gluteus maximus, biceps femoris (long head), semitendinosus, semimembranosus, gluteus medius (posterior fibers)
Muscles that medially rotate the hip
Gluteus medius (anterior fibers), tensor fascia latae, adductor longus, semitendinosus, semimembranosus
Muscles that laterally rotate the hip
Gluteus maximus, biceps femoris (long head)
Muscles that abduct the hip
Gluteus maximus, gluteus medius, tensor fascia latae
Muscles that adduct the hip
Adductor longus, gluteus maximus (lower fibers)
Muscles that flex the knee
Biceps femoris, semitendinosus, semimembranosus, gastrocnemius
Muscles that extend the knee
Rectus femoris, vastus lateralis, vastus intermedius, vastus medialis
Muscles that medially rotate the flexed knee
Semitendinosus and semimembranosus
Muscles that laterally rotate the flexed knee
Biceps femoris