Podcast
Questions and Answers
What is the primary action of the soleus muscle?
What is the primary action of the soleus muscle?
Which nerve is responsible for innervating the soleus muscle?
Which nerve is responsible for innervating the soleus muscle?
During which position should the strength of the soleus be tested to isolate its action from the gastrocnemius?
During which position should the strength of the soleus be tested to isolate its action from the gastrocnemius?
What are the origins of the soleus muscle?
What are the origins of the soleus muscle?
Signup and view all the answers
Which of the following actions is NOT performed by the gastrocnemius muscle?
Which of the following actions is NOT performed by the gastrocnemius muscle?
Signup and view all the answers
What is the primary action of the semitendinosus muscle at the knee joint?
What is the primary action of the semitendinosus muscle at the knee joint?
Signup and view all the answers
Which nerve is responsible for supplying the semitendinosus muscle?
Which nerve is responsible for supplying the semitendinosus muscle?
Signup and view all the answers
Where does the semitendinosus muscle originate?
Where does the semitendinosus muscle originate?
Signup and view all the answers
Which statement accurately describes the iliopsoas muscle's role in hip flexion?
Which statement accurately describes the iliopsoas muscle's role in hip flexion?
Signup and view all the answers
Which structure does the iliopsoas muscle pass under to reach the hip joint?
Which structure does the iliopsoas muscle pass under to reach the hip joint?
Signup and view all the answers
What is the primary function of the gluteus maximus muscle?
What is the primary function of the gluteus maximus muscle?
Signup and view all the answers
Which nerve primarily innervates the gluteus maximus muscle?
Which nerve primarily innervates the gluteus maximus muscle?
Signup and view all the answers
Which of the following muscles is located in the posterior compartment of the thigh?
Which of the following muscles is located in the posterior compartment of the thigh?
Signup and view all the answers
How does the tensor fascia lata contribute to movement?
How does the tensor fascia lata contribute to movement?
Signup and view all the answers
Where does the gluteus maximus muscle originate?
Where does the gluteus maximus muscle originate?
Signup and view all the answers
Which action is associated with the iliotibial band?
Which action is associated with the iliotibial band?
Signup and view all the answers
The insertion point of the gluteus maximus muscle is at the:
The insertion point of the gluteus maximus muscle is at the:
Signup and view all the answers
Which muscle group is primarily responsible for extending the hip joint?
Which muscle group is primarily responsible for extending the hip joint?
Signup and view all the answers
Study Notes
Posterior Compartment of the Leg
-
Gastrocnemius
- Action: Plantar Flexion
- Tiptoe test assesses gastrocnemius strength
- Knee flexion removes gastrocnemius action
- Soleus is seen during this test
-
Soleus
- Origin: Shafts of tibia and fibula
- Insertion: Tendo calcaneus into calcaneum
- Nerve Supply: Tibial nerve
- Nerve Roots: S1, S2
Posterior Compartment of the Thigh
-
Semitendinosus
- Origin: Ischial tuberosity
- Insertion: Upper medial shaft of tibia
- Nerve Supply: Tibial portion of sciatic nerve
- Nerve Roots: L5; S1, S2
- Action: Flexes and medially rotates leg at knee, extends thigh at hip
- Most medial tendon among the three posterior thigh muscles
- Has a long, prominent tendon
Anterior Compartment of the Thigh
-
Iliopsoas
- Prime hip flexor
- Active after 45 degrees of hip flexion
- Abdominals flex the hip before 45 degrees
- Composed of psoas major (medial) and iliacus (lateral) - collectively called iliopsoas
- Passes under the inguinal ligament
Muscles of the Lower Limb
-
Gluteus Maximus
- Thickest muscle in the body
- Mesomorphs have prominent gluteus maximus
- “Butt muscle”
- Forms the iliotibial band with the tensor fascia lata
- Gluteus Maximus blends into the Tensor Fascia Lata (TFL)
- Tightens the iliotibial band to lock the knee
- Shortening the muscle extends the hip
- Origin: Ilium, sacrum, coccyx, and sacrotuberous ligament
- Insertion: Iliotibial tract and gluteal tuberosity
-
Sartorius
- Located on the lateral surface of the thigh
- Thickest muscle in the body
- Responsible for the prominence of the buttocks
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
Test your knowledge on the muscles of the posterior compartment of the leg and thigh, as well as the anterior thigh. This quiz covers key muscles like the gastrocnemius, soleus, and iliopsoas, along with their actions, origins, and nerve supply. Perfect for students of anatomy and physiology!
