Core assessment principles
Puberty is a key factor determining the physical development of children and adolescents. The Tanner scale is used for objective visual assessment. It includes 5 stages, where stage I corresponds to the prepubertal period and stage V to full sexual maturity.
To systematize the signs, three main clinical criteria are distinguished:
- Breast development (Criterion B, Thelarche) in girls.
- Pubic hair development (Criterion PH, Pubarche) — a universal indicator for both sexes.
- External genitalia development (Criterion G) in boys.
Breast development (Criterion B)
When assessing Thelarche, attention is paid to the volume of glandular tissue and changes in the nipple-areolar complex:
- Stage B1: Prepuberty. The chest is flat, glandular tissue is not palpable.
- Stage B2: «Breast bud». Swelling appears under the areola, and the areola itself increases in diameter.
- Stage B3: Juvenile stage. The gland and areola continue to grow, forming a single cone-shaped contour.
- Stage B4: Formation of a «secondary mound». The nipple and areola begin to project above the general contour of the breast due to intensive growth.
- Stage B5: Mature breast. The areola merges back with the general contour, only the nipple projects.
Pubic hair development (Criterion PH)
Assessment of Pubarche is universal and takes into account the nature, density, and area of hair growth:
- Stage PH1: True (terminal) pubic hair is absent.
- Stage PH2: Sparse, faintly pigmented, long, and straight (or slightly wavy) hair appears (in girls along the labia majora, in boys at the base of the penis).
- Stage PH3: Transitional stage. Hair darkens, becomes coarser and curly, spreading over the pubic symphysis.
- Stage PH4: Adult-type hair growth, but over a limited area (forming a typical triangle or diamond).
- Stage PH5: Mature hair growth. Hair is dense, fully corresponds to the adult type, with characteristic spread to the medial thighs.
Male genitalia development (Criterion G)
In boys, the size of the penis, testicular volume, and changes in the scrotum are assessed:
- Stage G1: Infantile (childlike) sizes of the penis, testes, and scrotum.
- Stage G2: Beginning of penile elongation, enlargement of the testes and scrotum. Scrotal skin thins.
- Stage G3: Significant growth of the penis in length and width, continuing enlargement of the testes.
- Stage G4: Differentiation of the glans penis. Scrotal skin darkens (hyperpigmentation) and becomes rugose.
- Stage G5: Mature genitalia. All parameters correspond to an adult male.
To memorize the stages of breast development: 1 — flat, 2 — bud, 3 — cone (single), 4 — mound on a mound (double contour), 5 — adult profile (only the nipple projects).
Class and exam questions
At what age does puberty normally begin?
The physiological timeline for the onset of puberty is 8 to 13 years in girls and 9 to 14 years in boys.
What does the Tanner scale assess?
The Tanner scale assesses physical sexual development based on visual signs: breast development, pubic hair growth, and external genitalia growth.
Which stage of pubic hair development is characterized by the spread of hair to the thighs?
This is characteristic of stage V (PH5) — the stage of mature pubic hair development according to the Tanner scale.
What happens to the scrotum at stage G4?
At stage G4, the scrotal skin becomes rugose and exhibits marked pigmentation (darkening).
What else to study on this topic
- Assessment of testicular volume using an orchidometer
- Correlation of Tanner stages with growth spurts
- Precocious puberty: criteria and causes
- Delayed puberty: differential diagnosis
- Hormonal changes at various stages of puberty
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