Lower Limb Muscles Anatomy Quiz
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Questions and Answers

What is the origin of the Semitendinosus muscle?

  • Upper lateral part of the ischial tuberosity
  • Lower lateral part of the ischial tuberosity
  • Lower medial part of the ischial tuberosity (correct)
  • Upper medial part of the ischial tuberosity

Which nerve supplies the Semitendinosus muscle?

  • Obturator nerve
  • Common peroneal part of the sciatic nerve
  • Tibial part of the sciatic nerve (correct)
  • Femoral nerve

What is the primary action of the Semitendinosus muscle?

  • Flexion of the hip and extension of the knee
  • Extension of the hip and extension of the knee
  • Abduction of the hip and flexion of the knee
  • Extension of the hip and flexion of the knee (correct)

What is the origin of the Semimembranosus muscle?

<p>Upper lateral part of the ischial tuberosity (C)</p> Signup and view all the answers

Which muscle is named for being 'half membranous' in its upper part?

<p>Semimembranosus (D)</p> Signup and view all the answers

What is the primary insertion point of the Adductor magnus muscle?

<p>Linea aspera of the femur (A)</p> Signup and view all the answers

What is the nerve supply for the adductor magnus muscle (adductor portion)?

<p>Obturator nerve (A)</p> Signup and view all the answers

What is the primary action of the adductor longus muscle?

<p>Adduction of the hip joint (A)</p> Signup and view all the answers

Which of the following muscles arises from the ischial tuberosity?

<p>Adductor magnus (hamstring portion) (A)</p> Signup and view all the answers

Which muscle in the medial compartment of the thigh is involved in flexion of the knee joint?

<p>Gracilis (C)</p> Signup and view all the answers

What is the origin of the adductor brevis muscle?

<p>Body of the pubis and inferior pubic ramus (D)</p> Signup and view all the answers

Which muscle in the medial compartment of the thigh has an insertion point on the linea aspera?

<p>Both adductor longus and adductor brevis (B)</p> Signup and view all the answers

What is the origin of the Semimembranosus muscle?

<p>Groove on the back of the medial condyle of tibia (C)</p> Signup and view all the answers

Which nerve supplies the Semitendinosus muscle?

<p>Tibial part of the sciatic nerve (D)</p> Signup and view all the answers

What is the action of the Semimembranosus muscle?

<p>Extension of hip, flexion of knee, and medial rotation of leg (A)</p> Signup and view all the answers

What is the origin of the pubic part of the Adductor magnus muscle?

<p>Pubic and ischial rami (pubic arch) (A)</p> Signup and view all the answers

What is the insertion point of the ischial part of the Adductor magnus muscle?

<p>Adductor tubercle of femur (C)</p> Signup and view all the answers

Which nerve supplies the ischial part of the Adductor magnus muscle?

<p>Sciatic nerve (C)</p> Signup and view all the answers

Flashcards

Biceps Femoris Origin

The biceps femoris muscle has two origins: a long head originating from the linea aspera and lateral supracondylar ridge, and a short head from the linea aspera and lateral supracondylar ridge.

Biceps Femoris Insertion

The biceps femoris muscle inserts at the apex of the fibula's head (styloid process).

Biceps Femoris Nerve Supply

The biceps femoris long head is supplied by the tibial part of the sciatic nerve, while the short head receives innervation from the common peroneal part of the sciatic nerve.

Biceps Femoris Action (Knee)

The biceps femoris muscle flexes the knee joint.

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Biceps Femoris Action (Hip)

Its long head assists in hip extension and lateral leg rotation, important for knee locking.

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Semitendinosus Origin

The semitendinosus originates from the ischial tuberosity, specifically the lower medial part of its upper quadrilateral area, along with the long head of the biceps femoris.

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Semitendinosus Insertion

The semitendinosus inserts onto the upper part of the medial tibia, behind the sartorius and gracilis muscles.

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Semitendinosus Nerve

The semitendinosus is innervated by the tibial part of the sciatic nerve.

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Semitendinosus Action

The semitendinosus extends the hip, flexes the knee, and medially rotates the leg.

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Semimembranosus Origin

The semimembranosus originates from the upper lateral part of the quadrilateral portion of the ischial tuberosity.

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Semimembranosus Insertion

It inserts into the posterior aspect of the medial condyle of the tibia.

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Semimembranosus Nerve

The Semimembranosus muscle is innervated by the tibial component of the sciatic nerve.

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Semimembranosus Action

It extends the hip, flexes the knee, and medially rotates the leg.

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Medial Thigh Comp Muscles

The medial thigh compartment includes adductors longus, brevis, magnus (parts), and gracilis, whose function is hip adduction.

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Adductor Longus Origin

Originates from the body of the pubis just below the pubic tubercle.

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Adductor Longus Insertion

Inserts on the linea aspera.

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Adductor Longus Nerve

Innervated by the obturator nerve.

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Adductor Longus Action

Adducts the thigh and assists in thigh flexion, with rotation.

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Adductor Brevis Origin

Originates from the body and inferior pubic ramus.

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Adductor Brevis Insertion

Inserts on the part of the linea aspera.

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Adductor Brevis Nerve

Innervated by the obturator nerve.

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Adductor Brevis Action

Adducts the thigh and assists in flexion, with rotation.

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Study Notes

Biceps Femoris

  • Origin:
    • Long head: lower part of linea aspera and upper part of lateral supracondylar ridge
    • Short head: upper part of linea aspera and upper part of lateral supracondylar ridge
  • Insertion: apex (styloid process) of head of fibula
  • Nerve supply:
    • Long head: tibial part of sciatic nerve
    • Short head: common peroneal part of sciatic nerve
  • Action:
    • Flexion of knee
    • Long head: helps in extension of hip and lateral rotation of the leg at the end of extension of knee (locking of knee)

Semitendinosus

  • Origin: lower medial part of the upper quadrilateral area of the ischial tuberosity (along with the long head of biceps femoris)
  • Insertion: upper part of the medial surface of the tibia behind the insertion of sartorius and gracilis muscles
  • Nerve supply: tibial part of the sciatic nerve
  • Action:
    • Extension of hip
    • Flexion of knee
    • Medial rotation of the leg

Semimembranosus

  • Origin: upper lateral part of the quadrilateral area of the ischial tuberosity
  • Insertion: posterior aspect of the medial condyle of the tibia
  • Nerve supply: tibial part of the sciatic nerve
  • Action:
    • Extension of hip
    • Flexion of knee
    • Medial rotation of the leg

Medial Compartment of Thigh Muscles

  • Muscles:
    • Adductor longus
    • Adductor brevis
    • Adductor magnus (adductor and hamstring portions)
    • Gracilis
  • Action: adduction of hip joint
  • Nerve supply: obturator nerve (except ischial head of adductor magnus)

Adductor Longus

  • Origin: body of pubis just below pubic tubercle
  • Insertion: linea aspera
  • Nerve supply: obturator nerve
  • Action:
    • Adductor of thigh
    • Helps in flexion and rotation of thigh

Adductor Brevis

  • Origin: body of pubis and inferior pubic ramus
  • Insertion: lower part of line extending from the lesser trochanter to linea aspera and from upper part of linea aspera
  • Nerve supply: obturator nerve
  • Action:
    • Adductor of thigh
    • Helps in flexion and rotation of thigh

Adductor Magnus

  • Pubic part:
    • Origin: pubic and ischial rami (pubic arch)
    • Insertion: medial margin of gluteal tuberosity, linea aspera, medial supracondylar ridge
    • Nerve supply: obturator nerve
    • Action:
      • Adductor of thigh
      • Helps in flexion and lateral rotation of thigh
  • Ischial part:
    • Origin: lateral part of lower area of ischial tuberosity
    • Insertion: adductor tubercle of femur
    • Nerve supply: sciatic nerve
    • Action:
      • Extensor of hip joint
      • Helps in flexion and lateral rotation of thigh

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Description

Test your knowledge on lower limb muscles anatomy including details about their origin, insertion, nerve supply, and actions. Identify muscles like semimembranosus and adductor magnus based on provided information.

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