Crus of penis

Internal base of the human biological male sex organ

Crus of penis
The constituent cavernous cylinders of the penis. (Crus labeled at bottom left.)
Vertical section of bladder, penis, and urethra. (Crus penis labeled at bottom center.)
Details
Part of	Penis
Lymph	superficial inguinal lymph nodes
Identifiers
Latin	crus penis
TA98	A09.4.01.004
TA2	3665
FMA	18248
Anatomical terminology [edit on Wikidata]

The two crura of penis (one crus on each side) constitute the root of penis along with the bulb of penis. The two crura flank the bulb - one to each side of the bulb. Each crus is attached at the angle between the perineal membrane and ischiopubic ramus. The deep artery of the penis enters the anterior portion of the crus. Distally, each crus transitions into either corpus spongiosum of the body of the penis.^[1]

Structure

Each crus represents the tapering, posterior fourth of each corpora cavernosa penis; the two corpora cavernosa are situated alongside each other along the length of the body of penis while the two crura diverge laterally in the root of penis before attaching firmly onto either ischial ramus at their proximal end.^{[citation needed]}

Each crus begins proximally as a blunt-pointed process in anterior to the tuberosity of the ischium, along the perineal surface of the conjoined (ischiopubic) ramus.^{[citation needed]}

Just proximal to the convergence of the two crura, they come into contact with the bulb of (corpus cavernosum of) penis.^{[citation needed]}

The crura are covered by an ischiocavernosus muscle.

Additional images

Male urethra.

References

^ Sinnatamby, Chummy S. (2011). Last's Anatomy (12th ed.). p. 319. ISBN 978-0-7295-3752-0.

Male reproductive system

Internal

Seminal tract

Testicles	Layers Tunica vaginalis Tunica albuginea Tunica vasculosa Appendix Mediastinum Lobules Septa Leydig cells Sertoli cells Blood–testis barrier
Spermatogenesis	Spermatogonium Spermatocytogenesis Spermatocyte Spermatidogenesis Spermatid Spermiogenesis Spermatozoon
Other	Seminiferous tubules Tubuli seminiferi recti Retia testes Efferent ducts Epididymides Appendix Inferior ligaments Superior ligaments Stereocilia Paradidymides Spermatic cords Pampiniform plexus Vasa deferentia Ampullae Rectovesical pouch Ejaculatory ducts Testicular arteries Testicular veins

Accessory glands

External

Penis	Root Crura Bulb Fundiform ligament Suspensory ligament Body Corpora cavernosa Trabeculae of corpora cavernosa Corpus spongiosum Trabeculae of corpus spongiosum Glans Foreskin Frenulum Corona Septum glandis Fascia Superficial Deep Tunica albuginea Septum Raphe Arteries Arteries of bulb Dorsal arteries Deep arteries Internal pudendal artery Veins Dorsal veins Vein of bulb Internal pudendal veins Nerves Dorsal nerves Pudendal nerves Urethra Internal urethral sphincter Internal urethral orifice Pre-prostatic Prostatic Intermediate Spongy External sphincter muscle Navicular fossa Lacuna magna External urethral orifice Lacunae of Morgagni Urethral glands
Scrotum	Layers Skin Dartos fascia External spermatic fascia Cremaster Cremasteric fascia Internal spermatic fascia Ligament Raphe Septum Arteries Anterior scrotal arteries Posterior scrotal arteries Nerves Anterior scrotal nerves Posterior scrotal nerves Perineal nerve Posterior scrotal veins

Penis