Abstract
Background
Mechanism of testicular elevation during erection is not known. We investigated the hypothesis that erection evokes reflex cremasteric muscle (CM) contraction which effects testicular elevation.
Methods
Electromyographic (EMG) response of CM to erection was recorded in 26 healthy volunteers (age 36.7 ± 6.8 SD years). Erection was induced by intracavernosal injection of alprostadil. CM response was tested before and after individual glans penis (GP) and CM anesthetization.
Results
The CM exhibited resting electric activity of mean amplitude of 74.8 ± 6.3 μV which, on erection, increased to 486.6 ± 36.8 μV (P < 0.001). Response was momentary. Anesthetization of erect GP did not effect increase of CM EMG activity, while bland gel did. Anesthetized CM did not respond to GC erection while saline infiltrated did.
Conclusions
The CM appears to contract during erection through a reflex which we call ‘peno-cremasteric reflex’. CM contraction assumingly elevates testicle and support cord veins; it may effect testicular compression, thus expressing its secretions into vas deferens.
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References
Basu SC (2005) Erection, orgasm and ejaculation. In: Basu SC (ed) Male reproductive dysfunction, 1st edn. Jaypee Brothers, New Delhi, pp 39–60
Lue TF, Broderick G (1998) Evaluation and non-surgical management of erectile dysfunction and priapism. In: Walsh PC, Retik AB, Vaughan ED Jr, Wein AJ (eds) Campbell’s urology, 7th edn. WB Saunders, Philadelphia, pp 1181–1214
Ruppersberg JP, Herlitze S (1996) Innervation of muscle and neuromuscular transmission. In: Greger R, Windhorst U (eds) Comprehensive human physiology. From cellular mechanisms to integration. Springer, Berlin Heidelberg New York, pp 307–320
Ruppersberg JP, Herlitze S (1996) Reflexes. In: Greger R, Windhorst U (eds) Comprehensive human physiology. From cellular mechanisms to integration. Springer, Berlin Heidelberg New York, pp 2440–2441
Shafik A, Khalil MA, Saleh M (1972) The fasciomuscular tube of the spermatic cord. A study of its surgical anatomy and relation to varicocele. A new concept for the pathogenesis of varicocele. Br J Urol 44:147–151
Shafik A (1973) The cremasteric muscle. Role in varicocelogenesis and in thermoregulatory function of the testicle. Invest Urol 11:92–97
Shafik A (1991) The physiology of testicular thermoregulation in the light of new anatomical and pathological aspects. In: Zorgniotti AW (ed) Temperature and environmental effects on the testis, 1st edn. Plenum, New York, pp 153–172
Silva C, Ribeiro MI, Cruz F (2002) The effect of intravesical resiniferatoxin in patients with idiopathic detrusor instability suggests that involuntary detrusor contractions are triggered by C-fiber input. J Urol 168:575–579
Standring S (2005) Anterior abdominal wall. In: Standring S (ed) Gray’s anatomy: the anatomical basis of clinical practice. 39th edn. Elsevier, Churchill, pp 1101–1112
Swash M, Snooks SJ (1985) Electromyography in pelvic floor disorders. In: Henry MM, Swash M (eds) Coloproctology and the pelvic floor: pathophysiology and management. Butterworths, London, pp 88–103
Yokoyami O, Komastso K, Kodama K et al (2000) Diagnostic value of intravesical lidocaine for overactive bladder. J Urol 164:340–344
Acknowledgment
Margot Yehia assisted in preparing the manuscript.
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Shafik, A., Shafik, I., El Sibai, O. et al. Study of the cremasteric muscle during erection. Surg Radiol Anat 28, 569–572 (2006). https://doi.org/10.1007/s00276-006-0146-4
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DOI: https://doi.org/10.1007/s00276-006-0146-4