Shape of the testis Testis, epididymis, and vas(ductus) deferens vas(ductus)deferens pampiniform plexus body of epididymis ( shown lifted away from testis efferent ductules extremity Post bord Inf extremity tail of epididymis Ant border @2008 Encyclopaedia Britannica, Ino
Shape of the testis Shape of the testis Sup. extremity Post Inf extremity . border Inf.extremity Ant.border
Testicle of a cat 1 Extremitas capitata 2 Extremitas caudata 6 3 Margo epididymal, 4 Margo liber, 1 5 Mesorchium 6 Epididymis, 7 tetibular a. &v 8 ductus deferens CAVITY CAN SCROTUM
Testicle of a cat: 1 Extremitas capitata, 2 Extremitas caudata, 3 Margo epididymalis, 4 Margo liber, 5 Mesorchium 5 Mesorchium, 6 Epididymis, 7 tet bu a a & ibular a.& v. 8 Ductus deferens
The descend of testis Testes follow the"path of descent "from high in the posterior fetal abdomen to the inguinal ring and beyond to the inguinal canal and into the scrotum In most cases(97% full-term, 70% preterm), both testes have descended by birth. In most other cases, only one testis fails to descend (cryptorchidism and that will probably express itself within a year Internal (deep)ring External(superficial) ring Darto Cremaster muscle Internal spermatic fascia TunIca vaginalis(parietal Undescended Testes(Cryptorchidism) a testis that did not descend all the way into the scrotum
The descend of testis Testes follow the "path of descent" from high in the posterior fetal abdomen to the inguinal ring and beyond to the inguinal canal and into the scrotum. In most cases (97% full-term, 70% p) y reterm), both testes have descended b y birth. In most other cases, only one testis fails to descend (cryptorchidism) and that will probably express itself within a year. Undescended Testes ( yp ) Cr torchidism) - a testis that did not descend all the way into the scrotum
mal oblique muscle External oblique muscle tenaculum Between the seventh week and birth, the testes descend into the scrotum due to shortening of the gubernaculum. The testes pass through the inguinal canal in the anterior abdominal wall. After the th week, a peritoneal evagination, the processus vaginalis, forms just anterior to the gubernaculum It forms the inguinal canal by pushing out sock-like extensions of the transversalis fascia, the internal oblique muscle and external oblique muscle, The inguinal canal extends from the base of the inverted transversalis fascia(the deep ring) to the base of the everted external oblique muscle the superficial ring). After the processus vaginalis has evaginated into the scrotum, the gubernaculum shortens and pulls the gonads through the canal. The gonads always remain within the plane of the subserous fascia associated with the posterior wall of the processus vaginalis. By the end of the pregnancy the testes have completely entered the scrotal sac. The gubernaculum is reduced to a ligamentous band attaching the inferior pole of the testis to the scrotal floor. Within the first year after birth the superior part of the processus vaginalis is usually obliterated leaving a distal remnant sac, the tunica vaginalis, which lies anterior to the testis. Its lumen is normally collapsed but sometimes it may fill with serous secretions forming a testicular hydrocele
Between the seventh week and birth the testes descend into the scrotum due to shortening of the Between the seventh week and birth, the testes descend into the scrotum due to shortening of the gubernaculum. The testes pass through the inguinal canal in the anterior abdominal wall. After the 8th week, a peritoneal evagination, the processus vaginalis, forms just anterior to the gubernaculum. It forms the inguinal canal by pushing out sock-like extensions of the transversalis fascia, the internal oblique muscle and external oblique muscle The inguinal canal extends from the base of internal oblique muscle and external oblique muscle, The inguinal canal extends from the base of the inverted transversalis fascia (the deep ring) to the base of the everted external oblique muscle (the superficial ring). After the processus vaginalis has evaginated into the scrotum, the gubernaculum shortens and pulls the gonads through the canal. The gonads always remain within the plane of the subserous fascia associated with the posterior wall of the processus vaginalis By the plane of the subserous fascia associated with the posterior wall of the processus vaginalis. By the end of the pregnancy the testes have completely entered the scrotal sac. The gubernaculum is reduced to a ligamentous band attaching the inferior pole of the testis to the scrotal floor. Within the first year after birth the superior part of the processus vaginalis is usually obliterated leaving a distal remnant sac the tunica vaginalis which lies anterior to the testis Its lumen is normally collapsed remnant sac, the tunica vaginalis, which lies anterior to the testis. Its lumen is normally collapsed but sometimes it may fill with serous secretions forming a testicular hydrocele[1]
THE NORMAL MIGRATION OF THE TESTICLE: The testes develop in the abdominal cavity in early fetal life. By 14 to 17 weeks of intrauterine life they migrate to an opening in the body wall known as the inguinal canal. After 28 weeks they pass through the canal and by 35 to 40 weeks reach the scrotum Undescended testes. Undescended testes are a common problem At birth 3.5% of boys will have an undescended testes CAVITY NAL Approximately 30% will have both testes involved. a large proportion of these testes will have descended by 3 months after birth with just 1% of boys still having an INGUINAL undescended testes by 1 year of age CANAL Premature infants have a much higher SCROTUM chance of having an undescended testes Testicular descent is a complex process and not yet fully understood. It is known that the process depends on adequate hormone levels as well as mechanical and neurological factors
THE NORMAL MIGRATION OF THE TESTICLE THE NORMAL MIGRATION OF THE TESTICLE: The testes develop : The testes develop in the abdominal cavity in early fetal life. By 14 to 17 weeks of intrauterine life they migrate to an opening in the body wall known as the inguinal canal After 28 weeks they pass through the canal and by the inguinal canal. After 28 weeks they pass through the canal and by 35 to 40 weeks reach the scrotum. U d d dt t U n descen d e d tes tes . Ud dd n descen d e d testes are a common problem. At birth 3.5% of boys will have an undescended testes. Approximately 30% will have both testes Approximately 30% will have both testes involved. A large proportion of these testes will have descended by 3 months after birth with just 1% of boys still having an with just 1% of boys still having an undescended testes by 1 year of age. Premature infants have a much higher chance of having an undescended testes. chance of having an undescended testes. Testicular descent is a complex process and not yet fully understood. It is known that the pp q rocess de pends on ade quate hormone levels as well as mechanical and neurological factors