Anatomy of Posterior Thigh Muscles
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Questions and Answers

Which muscle attaches to the ischial tuberosity and medial tibial condyle?

  • Pectineus
  • Biceps femoris (short head)
  • Adductor magnus
  • Semimembranosus (correct)

    • What is the main nerve responsible for the innervation of the biceps femoris (short head) muscle?

  • Common fibular nerve (correct)
  • Tibial nerve
  • Obturator nerve
  • Femoral nerve

    • Which muscle group is composed of the semimembranosus, biceps femoris (long head), and the other posterior thigh compartment muscle?

  • ADDUCTOR
  • HAMSTRING
  • QUADRICEPS
  • HASMTRING (correct)

    • Which artery is responsible for supplying the medial compartment of the thigh and the femoral head?

    <p>Obturator artery</p> Signup and view all the answers

    Which muscle is responsible for extending the hip joint and flexing and internally rotating the knee joint?

    <p>Semimembranosus</p> Signup and view all the answers

    What is the order of the structures in the femoral triangle from lateral to medial?

    <p>Femoral nerve, artery, vein, and lymphatics</p> Signup and view all the answers

    What is the function of the patellar ligament in the knee joint?

    <p>It transmits forces produced by the quadriceps muscles to the tibia</p> Signup and view all the answers

    What is the stronger ligament in the knee joint?

    <p>Posterior cruciate ligament</p> Signup and view all the answers

    Which of the following muscles is NOT a border of the femoral triangle?

    <p>Quadriceps femoris muscle</p> Signup and view all the answers

    What is the purpose of the femoral sheath in the femoral triangle?

    <p>Surrounds the vessels and lymphatics</p> Signup and view all the answers

    Which nerve innervates the pectineus muscle in the medial thigh compartment?

    <p>Femoral nerve</p> Signup and view all the answers

    Which of the following muscles is NOT a part of the quadriceps femoris muscle group?

    <p>Sartorius</p> Signup and view all the answers

    What is the function of the iliopsoas muscle in the anterior thigh compartment?

    <p>Flexion and rotation of the hip</p> Signup and view all the answers

    Which of the following muscles attaches to the medial border of the tibial tuberosity?

    <p>All of the above</p> Signup and view all the answers

    What is the common innervation of the anterior thigh compartment muscles?

    <p>Femoral nerve (L2-L4)</p> Signup and view all the answers

    Which nerve is responsible for innervating the adductor magnus muscle?

    <p>Tibial nerve</p> Signup and view all the answers

    Which muscle is a hip flexor and knee extensor?

    <p>Semitendinosus muscle</p> Signup and view all the answers

    Which compartment of the thigh contains muscles that are primarily extensors of the hip or flexors of the knee?

    <p>Posterior thigh compartment</p> Signup and view all the answers

    Which muscle attaches to the trochanteric fossa and externally rotates the hip joint?

    <p>Obturator externus muscle</p> Signup and view all the answers

    Which structure contains the femoral artery and vein?

    <p>Adductor canal</p> Signup and view all the answers

    What is the function of the menisci in the knee joint?

    <p>To provide overall support to ligaments and reduce friction</p> Signup and view all the answers

    Which structure is NOT present in the popliteal fossa?

    <p>Femoral vein</p> Signup and view all the answers

    What is the division of the leg into three fascial compartments?

    <p>Anterior, lateral, and posterior</p> Signup and view all the answers

    What is the termination point of the small saphenous vein?

    <p>Popliteal fossa</p> Signup and view all the answers

    What is the branch of the sciatic nerve that is present in the popliteal fossa?

    <p>Tibial nerve</p> Signup and view all the answers

    Which muscle is responsible for unlocking the knee joint?

    <p>Popliteus muscle</p> Signup and view all the answers

    What is the function of the fibularis tertius muscle?

    <p>Dorsiflex the foot</p> Signup and view all the answers

    Which nerve innervates the muscles of the posterior compartment?

    <p>Tibial nerve</p> Signup and view all the answers

    Which muscle is not present in all individuals?

    <p>Fibularis tertius</p> Signup and view all the answers

    Which muscle attaches to the calcaneus bone via the common calcaneal tendon?

    <p>Gastrocnemius and soleus</p> Signup and view all the answers

    Which muscle group serves to plantarflex and evert the foot?

    <p>Lateral compartment</p> Signup and view all the answers

    What is the function of the tibialis posterior muscle?

    <p>Invert and plantarflex the foot</p> Signup and view all the answers

    Which muscle is responsible for flexing the great toe?

    <p>Flexor hallicus longus</p> Signup and view all the answers

    Which nerve innervates the muscles of the anterior compartment?

    <p>Deep fibular nerve</p> Signup and view all the answers

    What is the function of the flexor digitorum longus muscle?

    <p>Flex digits 2-5</p> Signup and view all the answers

    What is the primary area of the leg supplied by the anterior tibial artery?

    <p>Anterior leg compartment</p> Signup and view all the answers

    Which artery gives rise to the lateral and medial plantar arteries?

    <p>Posterior tibial artery</p> Signup and view all the answers

    Which vein drains the lateral aspect of the leg?

    <p>Small saphenous vein</p> Signup and view all the answers

    What is the primary nerve responsible for supplying sensation to the plantar surface of the foot?

    <p>Lateral plantar nerve</p> Signup and view all the answers

    What is the structure that provides support to the plantar surface of the foot?

    <p>Plantar aponeurosis</p> Signup and view all the answers

    Study Notes

    Femoral Triangle

    • Located in the inguinal region, contains femoral nerve, artery, vein, and lymphatics (NAVL) arranged from lateral to medial.
    • Bordered by sartorius muscle, adductor longus muscle, and inguinal ligament.
    • Surrounded by connective tissue femoral sheath which encloses vessels and lymphatics, excluding the femoral nerve.

    Knee Joint

    • Composed of tibiofemoral and patellofemoral joints, sharing a synovial capsule.
    • Supported by multiple ligaments, including:
      • Patellar ligament: Connects quadriceps to tibia.
      • Medial collateral ligament: Resists valgus forces; connects femur, medial meniscus, and tibia.
      • Lateral collateral ligament: Resists varus forces; connects femur to fibular head.
      • Anterior cruciate ligament (ACL): Resists anterior translation of tibia on femur.
      • Posterior cruciate ligament (PCL): Stronger than ACL; resists posterior translation of tibia.

    Muscles Involved in Knee Movement

    • Semimembranosus: Extends hip, flexes, and internally rotates knee; attaches to ischial tuberosity.
    • Biceps Femoris (Long Head): Extends hip, flexes, and externally rotates knee; attaches to ischial tuberosity.
    • Biceps Femoris (Short Head): Flexes and externally rotates knee; attaches to linea aspera.

    Vascularization

    • Primarily supplied by femoral artery and branches; also some contributions from the obturator artery.
    • Obturator artery arises from internal iliac artery, supplies medial compartment and femoral head.
    • Femoral artery gives rise to profunda femoris artery, which branches to supply the posterior thigh and hip joint.

    Knee Joint Support Structures

    • Menisci made of elastic fibrocartilage and providing support, reducing friction.
    • Bursa around the knee aid in friction reduction.

    Popliteal Fossa

    • Diamond-shaped area behind the knee, protected by a layer of fat.
    • Contains popliteal artery and vein, small saphenous vein, common fibular and tibial nerves, and lymph nodes.
    • Popliteal artery gives rise to several genicular branches that supply the knee capsule.

    Leg Anatomy

    • Runs from knee to ankle, divided into anterior, lateral, and posterior fascial compartments.
    • Anterior compartment: Dorsiflex foot; innervated by deep fibular nerve (e.g., tibialis anterior).
    • Lateral compartment: Plantarflex and evert foot; innervated by superficial fibular nerve (e.g., fibularis longus).
    • Posterior compartment: Plantarflex and invert foot; innervated by tibial nerve (e.g., gastrocnemius, soleus).

    Thigh Anatomy

    • Divided into anterior, medial, and posterior compartments.
    • Anterior compartment: Innervated by femoral nerve; includes iliopsoas, sartorius, and quadriceps femoris.
      • Quadriceps extend the knee; composed of rectus femoris, vastus lateralis, vastus intermedius, and vastus medialis.
    • Medial compartment: Innervated by obturator nerve; includes adductor muscles (pectineus, adductor longus/magnus/brevis, gracilis).
    • Posterior compartment: Primarily extensors of hip/flexors of knee; innervated by tibial nerve (e.g., semitendinosus).

    Blood Supply and Drainage

    • Anterior tibial artery: Supplies anterior and some lateral compartments; continues to form dorsalis pedis artery.
    • Posterior tibial artery: Supplies posterior compartment; branches into lateral/medial plantar arteries for foot supply.
    • Venous drainage via small saphenous (laterally) and great saphenous veins (medially).

    Foot Anatomy

    • Contains plantar aponeurosis for support; medial and lateral plantar nerves supply most muscles and sensation.
    • Dorsum sensory supplied by dorsal lateral cutaneous nerve of the foot.
    • Features complex muscular layers and compartments, aiding in foot function.

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    Description

    Learn about the attachments and functions of muscles in the posterior thigh compartment, including the semimembranosus and biceps femoris muscles. Understand their roles in extending the hip joint and flexing the knee joint.

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