Musculus ischiocavernosus
The ischiocavernosus originates from the ischiatic tuberosity and ischiatic arch (and related ischial surfaces) and inserts on the crus of the penis (or clitoris) and the tunica albuginea. By compressing the crus it reduces venous drainage from the corpus cavernosum, helping maintain erection. It is present in both sexes. Innervation is from the pudendal nerve. It works with other pelvic muscles during sexual function and is not externally visible.
Origin: Ischiatic tuberosity and ischiatic arch
Insertion: Crus of the penis (or clitoris) and tunica albuginea
Action: Maintains erection by compressing the crus and preventing venous drainage of the corpus cavernosum
Innervation: Pudendal nerve (S2-S4)
Isolated injury is rare. Dysfunction may be part of broader pelvic-nerve or traumatic injury. Relevant mainly in reproductive examinations or trauma cases.
## Overview Priapism is a persistent erection unrelated to sexual stimulation, most often following administration of phenothiazine tranquilizers such as acepromazine. Penile paralysis is inability t
Problems with this muscle are uncommon for owners to notice directly. Persistent difficulty with breeding or signs of pelvic trauma should be evaluated by a veterinarian.
## Overview Priapism is a persistent erection unrelated to sexual stimulation, most often following administration of phenothiazine tranquilizers such as acepromazine. Penile paralysis is inability to retract the penis, which may accompany priapism. Both cause swelling and can lead to permanent damage if not treated promptly. It is an emergency in stallions. ## Causes Phenothiazine tranquilizers (most common), pelvic trauma, or neurologic disease. ## Diagnosis History and clinical appearance of a persistently dropped or erect penis. ## Treatment Immediate veterinary care: massage, compression, medications to promote detumescence, and in refractory cases surgical shunts or partial amputation. The longer treatment is delayed, the worse the prognosis. ## Recovery and Prognosis Fair if treated early. Prolonged priapism often results in permanent paralysis and may end a breeding career. ## Prevention Avoid phenothiazine tranquilizers in breeding stallions when possible. Signs include: persistent penile protrusion without sexual stimulation; penile swelling and edema; inability to retract the penis; often follows phenothiazine tranquilizer
Isolated injury is rare. Dysfunction may be part of broader pelvic-nerve or traumatic injury. Relevant mainly in reproductive examinations or trauma cases.
Problems with this muscle are uncommon for owners to notice directly. Persistent difficulty with breeding or signs of pelvic trauma should be evaluated by a veterinarian.
See the Ischiocavernosus on our interactive 3D horse model. Open 3D Model