The muscle atrophy found in the ischiocavernosus and bulbocavernosus muscles further weakens the ability to provide rigidity and strength for the penile erection (Lavoisier et al.
The superficial layer consisting of the bulbocavernosus (BC), the ischiocavernosus (IC), and the transverse perineal muscles promote rigidity and ejaculation (Siegel, 2014).
The superficial pouch has structures common to both males and females, including the ischiocavernosus
, bulbospongiosus, superficial transversus perinei muscles, the pudendal vessels, and pudendal nerves.
The deep artery of the penis was determined to enter the cavernosus body of the penis by passing through the ischiocavernosus muscle and penetrating to the tunica albuginea, and finally showing a spiral type shape.
reported that the dorsal artery of the penis passed coudally through the body of the penis in a groove formed by the right and left ischiocavernosus muscle, and lied on each side of the sub ischiocavernosus muscles .
5,8) The perineal nerve supplies motor innervations to the pelvic floor muscles (transverse perineal muscles, bulbospongiosus, ischiocavernosus
, sphincter urethra and the levator ani muscles).
(see Figure 5-2) and bulbospongiosus muscles lie lateral and dorsal to the base of the penis, respectively.
This nerve originates from the Onuf nucleus (S2, 3, 4), and forms part of the somatic peripheral nervous system primarily responsible for the sensation from the genitalia and the contraction of bulbocavernosus and ischiocavernosus
muscles necessary for a rigid erection.
Table 1 CT Signs of Urethral Injuries in Patients With Pelvic Fractures (46) Patients Patients With Without Associated Associated Urethral Urethral Injuries Injuries CT Signs (n = 17) (n = 30) Distortion or concealment of urogenital diaphragm fat plane 15 (88) 1 (3) Hematoma of ischiocavernosus
15 (88) 5 (17) Distortion or concealment of prostatic contour 10 (59) 2 (7) Distortion or concealment of bulbocavernosus 8 (47) 3 (10) Hematoma of obturator internus 9 (53) 4 (13) Note: Numbers in parentheses are percentages.
Contraction of the ischiocavernosus
muscle leads to a further increase in intracavernous pressure causing a rigid erection.
During ejaculation, movement of spermatozoa along the vas deferens is caused by rhythmic contractions of the ischiocavernosus
and bulbospongiosus muscles.
muscle A skeletal muscle extending from the ischium to the corpus cavernosum of the penis.