Midwives in Nigeria routinely examine the male newborn during the initial postnatal assessment. While much of antenatal and intrapartum care focuses on the mother and the maternal-fetal unit, the immediate postpartum period requires a thorough physical evaluation of the neonate. Understanding the normal anatomy and variations of the male external genitalia ensures timely identification of congenital abnormalities and reassures parents during postnatal counseling. The primary structures visible externally are the penis and the scrotum, both of which play crucial roles in the urinary and reproductive systems.
The penis is the male copulatory organ and the distal conduit for the urinary system. It consists of three main anatomical regions: the root, the body (or shaft), and the glans penis.
Internally, the shaft is composed of three cylindrical masses of vascular, erectile tissue enclosed in a fibrous sheath called the tunica albuginea:
The distal end of the corpus spongiosum expands to form the glans penis, capped by the external urethral orifice. A retractable fold of skin known as the prepuce (or foreskin) covers the glans in uncircumcised males, a structure frequently addressed in cultural and religious contexts across Nigeria.
The functional capabilities of the penis involve complex neural and vascular interactions.
While erection and ejaculation are primarily reproductive functions, micturition is an excretory necessity shared by both sexes.
The scrotum is a cutaneous pouch suspended from the perineal region, divided internally into two compartments by a septum. Its primary evolutionary purpose is maintaining the testes at a temperature slightly cooler than core body temperature—about 2 to 3 degrees Celsius lower—which is essential for viable spermatogenesis.
Two key muscular structures regulate this temperature automatically:
In hot environments, both muscles relax to allow the testes to hang lower away from the body trunk, dissipating heat.
During embryonic development, the testes form high up on the posterior abdominal wall near the kidneys. As the fetus grows, they migrate downward, guided by a fibrous cord called the gubernaculum, passing through the inguinal canal to reach the scrotum by the final trimester of gestation.
Full-term male infants typically have fully descended testes in the scrotal sac. However, premature infants frequently present with cryptorchidism (undescended testes), where one or both testes have failed to complete their migration. Midwives must note that many cases of physiological undescended testes resolve spontaneously within the first few months of life as hormone levels stabilize and the infant grows, though persistent malposition requires surgical referral.
Midwives should be familiar with several common anatomical variations and abnormalities of the male external genitalia during neonatal assessments:
| Condition | Location of Opening or Swelling | Key Clinical Feature |
|---|---|---|
| Hypospadias | Ventral surface of penis | Urethral meatus displaced downward |
| Epispadias | Dorsal surface of penis | Urethral meatus displaced upward |
| Hydrocele | Scrotal sac | Fluid collection that transilluminates |
Performing a systematic examination of the male external genitalia is a core competency for midwives. The procedure should be conducted in a warm room to prevent the cold reflex from retracting the testes.
Clear documentation protects the healthcare provider and ensures continuity of care as the infant grows.