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The cremaster muscle is a thin, pouch-like muscle that holds the testicles in human males. It is an involuntary muscle that is responsible for the cremasteric reflex, a protective and physiologic superficial reflex of the testicles. The cremasteric reflex is a motor response that occurs when the inner part of the thigh is stroked, causing the cremaster muscle to contract and pull up the testicle toward the inguinal canal. While this reflex is generally protective, it can sometimes lead to complications such as testicular retraction and chronic orchialgia, which can be treated through microsurgical subinguinal cremaster muscle release (MSCMR). In this procedure, the cremaster muscle can be completely excised, providing relief without significant side effects.
| Characteristics | Values |
|---|---|
| Definition | The cremaster muscle is a paired structure made of thin layers of striated and smooth muscle that covers the testicles and the spermatic cords in human males. |
| Structure | The muscle has 2 parts, a lateral and medial cremaster muscle. |
| Origin | The lateral muscle originates from the internal oblique muscle and inguinal ligament, and the medial cremaster muscle usually originates from the pubic tubercle but sometimes from the lateral pubic crest. |
| Function | The cremaster muscle is responsible for the cremasteric reflex, a protective and physiologic superficial reflex of the testicles. The reflex raises and lowers the testicles in order to keep them protected and regulate scrotal temperature for optimal spermatogenesis. |
| Treatment for Spasms | Treatment for spasms can range from minor surgery to injection with Botulinum A toxin to the regular application of heat to relax the muscle. |
| Reflex | The cremasteric reflex is a superficial reflex found in human males that is elicited when the inner part of the thigh is stroked. Stroking of the skin causes the cremaster muscle to contract and pull up the ipsilateral testicle toward the inguinal canal. |
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What You'll Learn
Understanding the cremasteric reflex
The cremasteric reflex is a superficial reflex found in human males. It is elicited by lightly stroking or poking the superior and medial (inner) part of the thigh. When the inner thigh is stroked, sensory fibres of the ilioinguinal nerve are stimulated. These activate the motor fibres of the genital branch of the genitofemoral nerve, which causes the cremaster muscle to contract and elevate the testicle. The cremaster muscle is a paired structure made of thin layers of striated and smooth muscle. The muscle's name is derived from the Greek word "suspender". The cremasteric reflex is most commonly performed in the evaluation of acute scrotal pain and the assessment for testicular torsion.
The cremasteric reflex is not usually tested, unlike deep tendon, brainstem, and primitive reflexes. However, it can be helpful in recognising testicular emergencies. The presence of the reflex does not eliminate testicular torsion from a differential diagnosis, but it does broaden the possibilities to include epididymitis or other causes of scrotal and testicular pain. The reflex can be absent in a significant percentage of normal male children as well as patients with upper and lower motor neuron disorders, spinal injury at the L1 and L2 level, or if the ilioinguinal nerve has been cut inadvertently during hernia repair.
The absence of the cremasteric reflex is considered to be diagnostic for testicular torsion. The reflex has been reported to be absent in 100% of cases of testicular torsion, making it a potentially useful sign in this diagnosis. However, a significant number of case reports and small case series exist, demonstrating that the test is not 100% specific, and the reflex can be present in cases of testicular torsion. Therefore, it is important to also consider other factors, such as the patient's history and the results of diagnostic tests such as ultrasound, when evaluating scrotal pain and assessing for testicular torsion.
In some males, the cremasteric reflex may be exaggerated, which can occasionally lead to a misdiagnosis of cryptorchidism. Cryptorchidism is a condition where the testicle fails to descend into the scrotum. An exaggerated reflex may cause the testicle to appear retracted, even though it is not truly cryptorchid. Treatment options for an exaggerated cremasteric reflex may include microsurgical subinguinal cremaster muscle release (MSCMR), which has been shown to be effective in resolving testicular retraction and orchialgia.
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The cremaster muscle's role in thermoregulation
The cremaster muscle is a paired structure made of thin layers of striated and smooth muscle. The muscle's name is derived from the Greek word "suspender". The cremaster muscle is situated in the caudolateral borders of each spermatic cord.
The cremaster muscle is important for testis thermoregulation and sexual reflexes. The testis is a temperature-sensitive organ that needs to be maintained 2–7 °C below core body temperature to ensure the production of normal sperm. Failure to maintain testicular temperature in mammals impairs spermatogenesis and leads to low sperm counts, poor sperm motility, and abnormal sperm morphology in the ejaculate. The cremaster muscle relaxes when exposed to warm temperatures and aids in cooling the testes by moving them farther away from the core body temperature and by regulating the scrotal surface area.
The cremasteric reflex is a superficial reflex found in human males that is elicited when the inner part of the thigh is stroked. Stroking of the skin causes the cremaster muscle to contract and pull up the ipsilateral testicle toward the inguinal canal. The cremasteric reflex can be performed in assessing scrotal pain. Some studies report a high correlation between the loss of the cremasteric reflex and testicular torsion. The cremasteric reflex is a protective and physiological superficial reflex of the testicles. It plays a role in preserving the thermoregulation of the testicles as part of spermatogenesis.
The cremasteric reflex is more common during the winter months when colder temperatures cause the reflex to occur more frequently. The muscle will sometimes undergo severe spasms causing pain and limitation of activity. Treatment with botulinum toxin has been reported as a successful treatment option.
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Microsurgical subinguinal cremaster muscle release
The cremaster muscle is a thin muscle layer that surrounds the spermatic cord and testicle in men. The muscle's name is derived from the Greek word "suspender". The cremasteric reflex is a superficial reflex found in human males that is elicited when the inner part of the thigh is stroked. This reflex causes the cremaster muscle to contract and pull up the testicle toward the groin. Many men suffer from an overactive or tense cremaster muscle that leads to high-riding testicles or uncomfortable retraction of the testicles into the groin during exercise and sex.
The candidacy for MSCMR is determined by several factors, including the presence of testicular pain and retraction, normal digital rectal examinations, negative urinalyses, and vigorous retraction of the testis with Valsalva on examination. It is important to rule out other identifiable aetiologies for orchialgia before considering MSCMR.
The procedure is typically performed under local anaesthesia and can be done on an outpatient basis. The patient can expect a short recovery time and minimal scarring. The risks and complications of the procedure are relatively low but may include scrotal hematoma, infection, and damage to surrounding structures.
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The cremaster muscle in intravital microscopy
Intravital microscopy is a widely used method to visualize in vivo blood cells interacting with the endothelium and within the vessels. The cremaster muscle of rodents is one of the most common models used for intravital microscopy, alongside the hamster cheek pouch and rodent mesentery.
The cremaster muscle is prepared as a thin, flat sheet for optimal optical resolution. The surgical preparation involves freeing the muscle from surrounding tissue and the testes, spreading it onto a transparent pedestal of silastic rubber, and securing the edges with insect pins. A bead of waterproof silicone surrounds the preparation to contain any solution that may leak during the procedure. The mouse is maintained at a stable body temperature and plane of anesthesia.
Intravital microscopy in the cremaster muscle microcirculation is a suitable technique to study leukocyte-endothelial cell interactions at every stage of the leukocyte recruitment cascade: rolling, adhesion, intravascular crawling, and migration in postcapillary venules and arterioles. This technique also enables the assessment of vessel functionality, as hemodynamic parameters such as shear stress, flow rate, and vasodilation/vasoconstriction can be determined.
Furthermore, the response to multiple drugs and the mechanisms underlying blood cell interactions within the vascular system can be studied in a real-life scenario. For example, real-time imaging of the cremaster muscle has been used to study ischemia-reperfusion injury and the effects of acoustic cluster therapy on drug extravasation in tumors.
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The cremaster muscle in males vs. females
The cremaster muscle is a thin layer of striated and smooth muscle that covers the testicles and the spermatic cords in human males. It is a paired structure, with one on each side of the body. The cremaster muscle is an involuntary muscle, responsible for the cremasteric reflex, a protective and physiologic superficial reflex of the testicles. The cremasteric reflex is a superficial reflex found in human males that is elicited when the inner part of the thigh is stroked. This reflex is used to evaluate acute scrotal pain and testicular torsion.
The cremaster muscle is located in the inguinal canal and scrotum between the external and internal layers of spermatic fascia, surrounding the testis and spermatic cord. The lateral cremaster muscle originates from the internal oblique muscle, just superior to the inguinal canal. The medial cremaster muscle usually originates from the pubic tubercle but sometimes from the lateral pubic crest. The medial fibres fuse with the lateral ones and pass inferiorly, covering the spermatic cord. The cremaster muscle is innervated by the genitofemoral nerve, which provides sensory and motor innervation.
In females, the cremaster muscle is not fully developed as the internal genitalia are placed within the body and do not require the same level of protection. However, some remnants of the muscle are present near the distal portion of the round ligament of the uterus. The female counterpart of the cremasteric reflex is the Geigel reflex, which involves the contraction of muscle fibres along the upper part of the Poupart or inguinal ligament.
The cremaster muscle can occasionally go into painful spasms or cramps in adult males, which can be treated with minor surgery, injection of Botulinum A toxin, or the application of heat to relax the muscle.
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Frequently asked questions
The cremaster muscle is a thin, pouch-like muscle that holds the testicles. It is an involuntary muscle that is responsible for the cremasteric reflex, a protective and physiologic superficial reflex of the testicles.
The cremasteric reflex is a superficial reflex found in human males that is elicited when the inner part of the thigh is stroked. Stroking of the skin causes the cremaster muscle to contract and pull up the ipsilateral testicle toward the inguinal canal.
The cremaster muscle can be contracted voluntarily by performing Kegels or by flexing and tightening the abdominal muscles.
