Leg Muscle Anatomy Quiz: Test Your Knowledge of Lower Limb Muscles

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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?

Upper lateral part of the ischial tuberosity Signup and view all the answers

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

Semimembranosus Signup and view all the answers

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

Linea aspera of the femur Signup and view all the answers

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

Obturator nerve Signup and view all the answers

What is the primary action of the adductor longus muscle?

Adduction of the hip joint Signup and view all the answers

Which of the following muscles arises from the ischial tuberosity?

Adductor magnus (hamstring portion) Signup and view all the answers

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

Gracilis Signup and view all the answers

What is the origin of the adductor brevis muscle?

Body of the pubis and inferior pubic ramus Signup and view all the answers

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

Both adductor longus and adductor brevis Signup and view all the answers

What is the origin of the Semimembranosus muscle?

Groove on the back of the medial condyle of tibia Signup and view all the answers

Which nerve supplies the Semitendinosus muscle?

Tibial part of the sciatic nerve Signup and view all the answers

What is the action of the Semimembranosus muscle?

Extension of hip, flexion of knee, and medial rotation of leg Signup and view all the answers

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

Pubic and ischial rami (pubic arch) Signup and view all the answers

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

Adductor tubercle of femur Signup and view all the answers

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

Sciatic nerve Signup and view all the answers

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.