30 Questions
What is the main function of the iliopsoas muscle?
Flexing the thigh
Which muscle is formed by the fusion of the iliacus and psoas major muscles?
Iliopsoas
Where does the iliacus muscle originate from?
Iliac fossa
Which muscle is responsible for turning the thigh inward?
Psoas major
In how many cases does the psoas minor muscle join the structure of the iliopsoas muscle?
40-50%
From which vertebrae does the psoas major muscle start?
Lumbar vertebrae
Which muscle is the strongest and main flexor of the thigh?
Psoas major
What is the nerve source for the psoas major muscle?
Lumbar plexus
Which muscle is sometimes absent and is a small muscle when present?
Psoas minor
What is the only muscle that inserts into the lesser trochanter?
Iliopsoas
Which muscle is the only adductor muscle that crosses the knee joint?
Adductor magnus
Which muscle attaches to the gluteal tuberosity, 2/3 of the linea aspera, medial supracondylar line, and adductor tubercle?
Adductor magnus
Which muscle starts from the anterior face of the pubis and adheres to the middle 1/3 of the linea aspera?
Adductor longus
Which muscle of the hamstring group starts from the tuber ischiadicum and attaches to the upper part of the inner side of the tibia to form the pes anserinus?
Semitendinosus
Which muscle of the hamstring group is located deep in the inner part of the thigh and ends at the inner condyle of the tibia?
Semimembranosus
Which muscle of the hamstring group causes external rotation of the leg?
Biceps femoris
Which nerve innervates the muscles of the posterior group of the thigh, except for the short head of the biceps femoris?
Tibial nerve
Which muscle of the adductor group starts from the shaft and ramus inferior of the pubis and adheres to the upper 1/3 of the linea pectinea and linea aspera?
Adductor brevis
Which muscle of the adductor group starts from the body and ramus inferior of the pubis and attaches to the upper part of the inner surface of the tibia, the pes anserinus?
Adductor longus
Which muscle is not considered part of the hamstring group despite being located on the posterior-external part of the thigh?
Adductor magnus
Which muscle is the main extensor of the thigh?
Gluteus maximus
Which muscle is crucial for walking and can lead to a duck-like gait if paralyzed?
Gluteus medius
Which muscle is named after the way tailors sit?
Sartorius
Which muscle covers the front and side of the femur, giving extension to the leg?
Quadriceps femoris
Which muscle separates from the vastus intermedius and stretches the knee joint capsule in knee extension?
Articularis genus
Which muscle contributes to thigh adduction and flexion and is located on the inner side of the psoas major?
Pectineus
Which muscle runs along the inner edge of the thigh and knee, contributing to adduction and flexion of the thigh?
Gracilis
Which muscle aids in flexion, abduction, and internal rotation of the thigh by stretching the fascia latae?
Tensor fascia latae
Which muscle causes external rotation and fixes the hip joint, among the listed muscles?
Piriformis
Which muscle contributes to thigh abduction and internal rotation, among the listed muscles?
Gluteus minimus
Study Notes
Muscles of the Pelvis and Thigh Anatomy
- Gluteus maximus is the largest and thickest muscle in the human body, serving as the main extensor of the thigh and assisting in external rotation and leg extension.
- Gluteus medius is the strongest abductor muscle of the thigh, crucial for walking, and its paralysis can lead to a duck-like gait.
- Gluteus minimus functions similarly to the gluteus medius, contributing to thigh abduction and internal rotation.
- Tensor fascia latae aids in flexion, abduction, and internal rotation of the thigh by stretching the fascia latae.
- The external rotator muscles of the thigh, including piriformis, gemellus, obturator internus, quadratus femoris, and obturator externus, cause external rotation and fix the hip joint.
- Fascia latae and linea aspera divide the thigh into anterior, medial, and posterior compartments.
- Sartorius, the longest muscle in the body, causes abduction, external rotation, and flexion of the thigh, and is named after the way tailors sit.
- Quadriceps femoris, comprising vastus lateralis, rectus femoris, vastus medialis, and vastus intermedius, covers the front and side of the femur, giving extension to the leg.
- Articularis genus, a small muscle separating from the vastus intermedius, stretches the knee joint capsule in knee extension.
- The adductor muscles on the medial side of the thigh, including pectineus, adductor brevis, adductor longus, adductor magnus, and gracilis, contribute to thigh adduction and flexion.
- Pectineus, located on the inner side of the psoas major, originates from the pecten ossis pubis and attaches to the linea pectinea in the femur, aiding in thigh adduction and flexion.
- Gracilis runs along the inner edge of the thigh and knee, contributing to adduction and flexion of the thigh.
Test your knowledge of the muscles of the pelvis and thigh with this anatomy quiz. Identify key muscles such as the gluteus maximus, medius, and minimus, as well as the quadriceps femoris and adductor muscles. Learn about their functions and how they contribute to movement and stability in the lower body.
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