18 Questions
What is the origin of the Semitendinosus muscle?
Lower medial part of the ischial tuberosity
Which nerve supplies the Semitendinosus muscle?
Tibial part of the sciatic nerve
What is the primary action of the Semitendinosus muscle?
Extension of the hip and flexion of the knee
What is the origin of the Semimembranosus muscle?
Upper lateral part of the ischial tuberosity
Which muscle is named for being 'half membranous' in its upper part?
Semimembranosus
What is the primary insertion point of the Adductor magnus muscle?
Linea aspera of the femur
What is the nerve supply for the adductor magnus muscle (adductor portion)?
Obturator nerve
What is the primary action of the adductor longus muscle?
Adduction of the hip joint
Which of the following muscles arises from the ischial tuberosity?
Adductor magnus (hamstring portion)
Which muscle in the medial compartment of the thigh is involved in flexion of the knee joint?
Gracilis
What is the origin of the adductor brevis muscle?
Body of the pubis and inferior pubic ramus
Which muscle in the medial compartment of the thigh has an insertion point on the linea aspera?
Both adductor longus and adductor brevis
What is the origin of the Semimembranosus muscle?
Groove on the back of the medial condyle of tibia
Which nerve supplies the Semitendinosus muscle?
Tibial part of the sciatic nerve
What is the action of the Semimembranosus muscle?
Extension of hip, flexion of knee, and medial rotation of leg
What is the origin of the pubic part of the Adductor magnus muscle?
Pubic and ischial rami (pubic arch)
What is the insertion point of the ischial part of the Adductor magnus muscle?
Adductor tubercle of femur
Which nerve supplies the ischial part of the Adductor magnus muscle?
Sciatic nerve
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
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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