Podcast
Questions and Answers
Which nerve innervates the muscles in the posterior compartment of the thigh?
Which nerve innervates the muscles in the posterior compartment of the thigh?
Sciatic nerve
What is the arterial supply to the muscles in the posterior compartment of the thigh?
What is the arterial supply to the muscles in the posterior compartment of the thigh?
Inferior gluteal artery and perforating branches of the deep femoral artery
How many heads does the biceps femoris muscle have?
How many heads does the biceps femoris muscle have?
Two
Which muscle in the posterior compartment of the thigh is flat and broad?
Which muscle in the posterior compartment of the thigh is flat and broad?
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What is an avulsion fracture?
What is an avulsion fracture?
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What is the typical symptom experienced by patients with an avulsion fracture of the ischial tuberosity?
What is the typical symptom experienced by patients with an avulsion fracture of the ischial tuberosity?
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Why can an avulsion fracture of the ischial tuberosity be associated with sciatic nerve damage?
Why can an avulsion fracture of the ischial tuberosity be associated with sciatic nerve damage?
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In cases of avulsion fractures of the ischial tuberosity, which of the following muscles is most likely affected?
In cases of avulsion fractures of the ischial tuberosity, which of the following muscles is most likely affected?
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Why can an avulsion fracture of the ischial tuberosity lead to an inability to walk?
Why can an avulsion fracture of the ischial tuberosity lead to an inability to walk?
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How does an avulsion fracture differ from a regular fracture of a bone?
How does an avulsion fracture differ from a regular fracture of a bone?
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Which muscle in the posterior compartment of the thigh is largely tendinous?
Which muscle in the posterior compartment of the thigh is largely tendinous?
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Which artery supplies the muscles in the posterior compartment of the thigh with blood?
Which artery supplies the muscles in the posterior compartment of the thigh with blood?
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Where can the common tendon of the two heads of the biceps femoris be palpated?
Where can the common tendon of the two heads of the biceps femoris be palpated?
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Which muscle in the posterior compartment of the thigh is the most lateral?
Which muscle in the posterior compartment of the thigh is the most lateral?
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Study Notes
Nerve and Arterial Supply
- The sciatic nerve innervates the muscles in the posterior compartment of the thigh.
- The arterial supply to these muscles is primarily from the profunda femoris artery (deep femoral artery).
Biceps Femoris
- The biceps femoris muscle has two heads: a long head and a short head.
- The long head of the biceps femoris is located laterally, while the short head is located more medially.
Muscle Characteristics
- The semitendinosus muscle is flat and broad among the posterior thigh muscles.
- The semimembranosus muscle is largely tendinous, contributing to its overall structure.
Avulsion Fractures
- An avulsion fracture occurs when a fragment of bone is separated by a tendon or ligament due to sudden force.
- Typical symptoms of an avulsion fracture of the ischial tuberosity include pain and difficulty in hip flexion and knee extension.
Sciatic Nerve Damage
- An avulsion fracture of the ischial tuberosity may be associated with sciatic nerve damage due to proximity, which can affect nerve function.
- The hamstring muscles, particularly the biceps femoris, are most likely affected in cases of avulsion fractures at the ischial tuberosity.
Functional Implications
- An avulsion fracture at the ischial tuberosity could lead to an inability to walk due to pain and loss of function in the hamstring muscles.
- Unlike regular fractures, avulsion fractures involve the separation of bone fragments by muscle tension, rather than a break through the bone substance.
Palpation Points
- The common tendon of the two heads of the biceps femoris can be palpated at the lateral aspect of the posterior thigh.
Muscle Orientation
- The biceps femoris is the most lateral muscle in the posterior compartment of the thigh.
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Description
Learn about the muscles in the posterior compartment of the thigh, collectively known as the hamstrings, their attachments, actions, and clinical correlations. Understand their innervation by the sciatic nerve and arterial supply. Dive into the anatomy of the muscles in the posterior thigh.
