موقع صحة الأسرة هو موقع علمي يناقش المشاكل الجنسية للرجل والمرأة ومشاكل العقم والولادة وأطفال الأنابيب ، يشرف على الموقع الدكتور حسين غانم والدكتور عبد المجيد رمزي

Men's Health - Erectile dysfunction
MECHANISM OF ERECTION

 

 

MECHANISM OF ERECTION
Neural mechanisms
- Central sexual stimulation:
Through thinking, seeing, hearing, smelling, touching etc.
-Reflex stimulation:

Sensory (afferent) limb:

Through stimulating the dorsal nerve of the penis and other sensory divisions of the pudendal nerve.

Motor (efferent) limb:

Erection is a parasympathetic response involving sacral segments S2,3,4. Efferent neurons pass along the pelvic nerves to relay in the parasympathetic ganglia within the walls of the pelvic viscera, and reach the corpora cavernosa and cavernosal arteries through the cavernosal nerves.

Ejaculation on the other hand is a combined response consisting of
1- Emission into the posterior urethra.
2- bladder neck closure (sympathetic T12,L1,2,3).
3- Ejaculation proper (sympathetic + somatic).

Vascular response
1- Cavernosal artery dilatation
2- Sinusoidal relaxation in the corpora cavernosa
3- Passive venous occlusion due to compression of intersinusoidal, subtunical and emissary veins between the expanding blood sinusoids and the tunica albuginea which is the tough covering of the corpora cavernosa.

 

Copyrights Dr. Hussein Ghanem 1999 All Rights Reserved
جميع حقوق الطبع والنشر محفوظة للدكتور حسين غانم لعام 1999

 

 

Page written & discussion moderated by:
Professor of Andrology, Cairo University
Formerly: Fellow in Male Reproductive Medicine and Surgery,
Baylor College of Medicine, Houston, Texas, USA
Formerly: Fellow in Male Sexual Function, Reproduction, and Surgery,
University of Iowa Hospitals & Clinics, Iowa City, Iowa, USA
Telephone: +(202) 761 3334
E-mail: ghanem@family-clinics.com
Address: 139 (A) Al-Tahrir Street, Dokki, Cairo, Egypt

 

 


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