Studied by 7 people
Location and Components
Located in the pelvis region
Includes a pair of testes, accessory ducts, glands, and external genitalia
Testes
Situated in the scrotum outside the abdominal cavity
Scrotum maintains low temperature for spermatogenesis
Each testis is oval-shaped, 4-5 cm in length, and 2-3 cm in width
Covered by a dense covering
Contains about 250 testicular lobules
Testicular Lobules
Each lobule contains 1-3 highly coiled seminiferous tubules
Spermatogenesis occurs in the seminiferous tubules
Accessory Ducts and Glands
Include epididymis, vas deferens, ejaculatory duct, and urethra
Glands like seminal vesicles, prostate gland, and bulbourethral glands contribute to semen production
External Genitalia
Consists of penis and scrotum
Penis is involved in copulation and urine excretion
Scrotum houses the testes and helps regulate their temperature
Function
Production of sperm cells (spermatogenesis)
Secretion of male sex hormones (e.g., testosterone)
Delivery of sperm to the female reproductive system during sexual intercourse
Male reproductive system
The ______ is located in the pelvis region (Figure 2.1a).
Testes
It includes a pair of ______ along with accessory ducts, glands, and the external genitalia.
Scrotum
The testes are situated outside the abdominal cavity within a pouch called ______.
Spermatogenesis
The scrotum helps in maintaining the low temperature of the testes (2–2.5o C lower than the normal internal body temperature) necessary for ______.
Testis
In adults, each ______ is oval in shape, with a length of about 4 to 5 cm and a width of about 2 to 3 cm.
Testis
The ______ is covered by a dense covering.
Testicular lobules
Each testis has about 250 compartments called ______ (Figure 2.1b).
Seminiferous tubules
Each lobule contains one to three highly coiled ______ in which sperms are produced.
Male germ cells
Each seminiferous tubule is lined on its inside by two types of cells called ______ (spermatogonia) and Sertoli cells (Figure 2.2).
Spermatogonia
The male germ cells undergo meiotic divisions finally leading to sperm formation, while Sertoli cells provide nutrition to the ______.
Leydig cells
Leydig cells synthesise and secrete testicular hormones called ______.
Androgens
Leydig cells synthesise and secrete testicular hormones called ______.
Rete testis
The seminiferous tubules of the testis open into the vasa efferentia through ______.
Epididymis
The vasa efferentia leave the testis and open into ______ located along the posterior surface of each testis.
Vas deferens
The epididymis leads to ______ that ascends to the abdomen and loops over the urinary bladder.
Leydig cells
Leydig cells synthesise and secrete testicular hormones called ______.
Androgens
Leydig cells synthesise and secrete testicular hormones called ______.
Rete testis
The seminiferous tubules of the testis open into the vasa efferentia through ______.
Epididymis
The vasa efferentia leave the testis and open into ______ located along the posterior surface of each testis.
Vas deferens
The epididymis leads to ______ that ascends to the abdomen and loops over the urinary bladder.
Ejaculatory duct
It receives a duct from seminal vesicle and opens into urethra as the ______.
Urethra
The urethra originates from the urinary bladder and extends through the penis to its external opening called ______.
Glans penis
The enlarged end of the penis called the ______ is covered by a loose fold of skin called foreskin.
Seminal vesicles
The male accessory glands include paired ______, a prostate, and paired bulbourethral glands.
Prostate
The male accessory glands include paired seminal vesicles, a ______, and paired bulbourethral glands.
Bulbourethral glands
The male accessory glands include paired seminal vesicles, a prostate, and paired ______.
Seminal plasma
Secretions of these glands constitute the ______ which is rich in fructose, calcium, and certain enzymes.
Lubrication
The secretions of bulbourethral glands also help in the ______ of the penis.
