adductors and quadriceps link muscles of the anterior thigh
TRANSCRIPT
Adductors and QuadricepsLink
Muscles of the Anterior Thigh
MUSCLES OF THE MEDIAL THIGH:ADDUCTORS
GRACILIS Most superficial adductor Gracilis= “slender” Much larger in the cat Unique in that it inserts
on the tibia (along with sartorious)
GRACILIS
O- Pubis I- Medial epicondyle A- Adducts thigh,
flexes & medially rotates leg (at the knee)
Gracilis
“Adductors”
Adductor Magnus (large)– Adductor femoris in cats
Adductor Longus (long) Adductor Brevis (short)
– deep to longus– won’t see in the cat
All ADDUCT, LATERALLY ROTATE, FLEX THIGH
ADDUCTOR MAGNUS
O-inferior pubis/ischial tuberosity I- linea aspera/medial epicondyle A- Adducts thigh
Superior fibers: flex/laterally rotate thigh Vertical fibers: extend thigh
ADDUCTOR LONGUS O-Pubis I- Middle 1/3 of linea
aspera A- Adducts, laterally
rotates, flexes thigh
ADDUCTOR BREVIS O- Pubis I- Proximal linea
aspera A- Adducts, laterally
rotates flexes thigh
PECTINEUS O- Pubis I- Distal to the lesser
trochanter A- Adducts & flexes thigh
Adductor femoris (magnus)adj. to semimembranosus
Adductor longus, Pectineus
Medial Thigh Muscles
Quadriceps Rectus femoris (straight fibers) Vastus medialis (medial) Vastus intermedius (middle)
– Deep to rectus femoris Vastus lateralis (lateral) All muscles share the quadriceps tendon, which inserts on the patella, and continues as the patellar tendon to the tibial tuberosity
All muscles have the action of extending the knee
RECTUS FEMORIS
O- anterior inferior iliac spine (AIIS)
I- patella>>tibial tuberosity
A- extends knee
VASTUS MEDIALIS VASTUS INTERMEDIUS
VASTUS LATERALIS
O- VM: linea aspera O- VI: anterior-lateral femur O- VL: posterior-lateral femur
FOR ALL: I- patella>>tibial tuberosity A- extends knee
Rectus femoris, vastus medialis & lateralis
Patellar Tendon/Ligament
Other muscles of the ANTERIOR THIGH
SARTORIUS (sartor=tailor)– Longest muscle in the body
TENSOR FASCIAE LATAE (tensor = tightener, fascia = band, latus = wide)– Continuous with the iliotibial
tract/band
SARTORIUS
O- anterior superior iliac spine (ASIS)
I- medial, proximal tibia A- Flexes, abducts, laterally
rotates thigh; flexes knee (like looking at the bottom of your shoe to see if you stepped in gum!
SARTORIUSsuperficial; lateral to gracilis
TENSOR FASCIAE LATAE (TFL)
O- ASIS, iliac crest I- iliotibial band>>
lateral condyle of tibia A- abducts thigh,
stabilizes knee & hip
Tensor Fasciae Latae
Quiz yourself here…
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