anatomyphysiologyblog - Gross Anatomy of Urethra

This banker's complaint briefly describes nearly the gross anatomy of manful individual together with female  urethra along alongside its blood supply, lymphatic drainage together with innervation.

General Consideration

Urethra is the terminal purpose of the urinary tract together with conducts urine from bladder to exterior.

Male urethra together with woman individual urethra are considered separately below.

MALE URETHRA

•         Muscular tube

•         18-20 cm long

•         Extends from internal urethral orifice of the urinary bladder to the external urethral orifice at the tip of the glans penis

•         also acts every bit the purpose of genital tract past times providing a passageway for semen during ejaculation.

•         Divided into 4 parts

      •         Preprostatic urethra

      •         Prostatic urethra

  •         Membranous urethra

      •         Spongy urethra

Preprostatic Urethra or Intramural purpose of urthra

•         1-1.5 cm long

•         Extends vertically from bladder cervix to the superior human face of prostate

•         Associated alongside internal urethral sphincter

     –        Prevents retrograde crusade of semen to the bladder

Prostatic urethra

•         4 cm long – widest together with most dilatable part

•         Descends through the anterior purpose of the prostate

•         Forms a gentle curved sort alongside anterior concavity

Internal features

•         Posterior wall presents

–        Urethral crest

–        Prostatic sinus on each side of the crest

–        Seminal colliculus inward middle purpose of the crest

      •         Presents slitlike orifice which leads to Prostatic Utricle

      •         Ejaculatory duct open on/within prostatic utricle

Membranous part

•         Shortest together with narrowest part, 1-2 cm long

•         Lies inward the perineal region

•         Begins at the apex of prostate together with ends at the bulb of the penis

•         Traverses the deep perineal pouch and passes through the external urethral sphincter and perineal membrane

•         Associated alongside the external urethral sphincter

•         Posterolaterally related alongside Bulbourethral or Cowper’s gland

Spongy urethra

•         The longest purpose (15-16 cm together with v mm inward diameter)

•         Passes through the bulb (Bulbar purpose of spongy urethra) together with corpus spongium of the penis (Penile purpose of spongy urethra)

•         Ends at the external urethral orifice

•         Expanded

     •         in the bulb of penis – intrabulbar fossa together with

     •         In the glans penis – navicular fossa

•         Proximal purpose receives opening of ducts of bulbourethral glands

•         Also receives openings of urethral glands

Arteries, veins, lymph nodes together with nerves

•         Proximal 2 parts

–        Arterial provide past times Prostatic branches of inferior vesical together with middle rectal arteries

–        Veins follow the arteries together with accept same name

–        Lymph drains to a greater extent than frequently than non to internal iliac lymph nodes

–        Nerves are derived from pudendal nerves together with prostatic plexus

•         Distal 2 parts

–        Artery: Branches of internal pudendal artery

–        Vein: Internal pudendal veins

–        Lymph nodes: Membranous urethra drains to internal iliac lymph nodes together with most of spongy urethra drains to deep inguinal lymph nodes

–        Nerves: are branches of pudendal nerve

–        Also derived from prostatic plexus

–        Afferent fibers passes through pelvic splanchnic nerves

FEMALE URETHRA

•         4 cm long together with vi mm inward diameter

•         Begins at the bladder cervix together with passes anteroinferiorly from the internal urethral orifice

•         Ends at external urethral orifice inward the entrance hall of vagina

       –        Lies anterior to the orifice of vagina

•         Lies anterior to the vagina

•         Its axis is parallel to that of vagina

•         Receives the openings of urethral together with paraurethral galnds

Arteries, veins, lymph nodes together with innervation

•         Arteries – internal pudendal together with vaginal arteries

•         Veins – follow the arteries together with accept similar names

•         Lymph nodes – sacral together with internal iliac

•         Innervation – pudendal nerve

REFERENCES:

Following resources are used patch preparing this transportation service (readers are strongly recommended to larn through them for to a greater extent than details):

Gray's Anatomy for Students

K. L. Moore's Clinically Oriented Anatomy

R. Snell's Clinical Anatomy

Tweet