Comparing the Development of Male and Female Urethras скачать в хорошем качестве

Comparing the Development of Male and Female Urethras

Development of male and female urethra Topics included in this video Steps of urethral development Development of male and female urethra Difference between male and female development of urethra How different histological layers of urethra is developed Summary The development of male & female urethra is different The female urethra is short & its development is very simple but male urethra is long & its development is complicated The development of male urethra is intimately related to the development of external genital organs The epithelium of entire female urethra & most of the male urethra is derived from urogenital sinus Urogenital sinus is developed from cloaca Cloaca : part of hindgut caudal to attachment of allantois, which is common chamber for hindgut & urinary system Cloaca is divided into 2 parts by urorectal septum  ventral part: primitive urogenital sinus Dorsal part: primitive rectum Parts of primitive urogenital sinus :vesico-urethral canal & definitive urogenital sinus For explaining development Primitive urogenital sinus can be divided into 4 part From above down ward Structures derive from primitive urogenital sinus From above down ward Urinary bladder is developed from Upper part of vesico-urethral canal : Urethra is developed from Lower part of vesico-urethral canal Pelvic part of definitive urogenital sinus Phallic part of definitive urogenital sinus Histology only the lining epithelium of the urethra is derived from endoderm of urogenital sinus Connective tissue and smooth muscles of urethra are derived from surrounding splanchnopleuric layer of lateral plate mesoderm (intraembryonic mesoderm ) Development of female urethra Lower part of vesico-urethral canal develops Most of the proximal part of female urethra Pelvic part of definitive urogenital sinus develops Small distal part of female urethra Phallic part of definitive urogenital sinus develops Vestibule of female external genitalia into which the urethra is opened (external opening ) Male urethra Lower part of vesico-urethral canal develops Prostatic part of urethra up to the level of opening of ejaculatory duct Pelvic part of definitive urogenital sinus develops Prostatic part of urethra below the opening of ejaculatory duct and membranous part of urethra Phallic part of definitive urogenital sinus develops Penile part of urethra Surface ectoderm develops Terminal part (which occupies the glans penis ) Difference between development of male & female urethra Lower part of vesico-urethral canal develops in case male: Prostatic part of urethra up to the level of opening of ejaculatory duct in case female : Most of the part of female urethra (upper part) Pelvic part of definitive urogenital sinus develops in case male Prostatic part of urethra below the opening of ejaculatory duct and membranous part of urethra in case female Small part of female urethra (lower part) Phallic part of definitive urogenital sinus develops in case male Penile part of urethra in case female Vestibule of female external genitalia into which the urethra is opened (external opening ) Histology in case male Most of the lining epithelium is derived from endoderm of urogenital sinus except terminal part which is derived from surface ectoderm in case female Entire lining epithelium is derived from endoderm of urogenital sinus Rest of the histological layer of male and female urethra is derived from splanchnopleuric layer of lateral plate mesoderm For more topics of anatomy Please visit 1. Difference between : microscopicanatomybd.blogspot.com https://draft.blogger.com/blog/posts/... 2. Easy humanatomy : easyhumanatomy73.blogspot.com, https://draft.blogger.com/blog/posts/... 3. easy humanatomy facebook page 4. For powerpoint presentation https://www.slideshare.net/daisy73/ed...