2026 CTgyn Exam Prep: Gynecologic Cytologist
Practice Questions, Answer Rationales, Cervical
Cytology, Screening, Microscopy, Specimen
Evaluation & Laboratory Study Guide
SECTION 1: ANATOMY, PHYSIOLOGY & EMBRYOLOGIC ORIGINS
(Questions 1–5)
1. During embryonic development, the Müllerian (paramesonephric) ducts give
rise to which of the following structures?
A) Ovaries
B) Fallopian tubes, uterus, cervix, and upper vagina
C) Labia majora and minora
D) Clitoris and vestibule
Rationale: The Müllerian ducts develop into the fallopian tubes, uterus, cervix,
and upper two-thirds of the vagina. The ovaries develop from the gonadal ridge
(not Müllerian ducts). The lower third of the vagina, labia, clitoris, and vestibule
develop from the urogenital sinus and external genitalia. The Anatomy,
Physiology, and Embryologic Origins subtest comprises 5% of the CTgyn exam .
2. The transformation zone of the cervix is best defined as:
A) The area of columnar epithelium only
B) The region where columnar epithelium has been replaced by squamous
metaplasia
C) The area of native squamous epithelium
D) The endocervical canal
Rationale: The transformation zone (TZ) is the area between the original
squamocolumnar junction and the new squamocolumnar junction, where columnar
epithelium undergoes squamous metaplasia. This is the site of origin for most
cervical neoplasia. The TZ is the target for cervical cytology sampling and is
,defined by the presence of endocervical or metaplastic cells. The presence of a TZ
component is documented in Bethesda reporting .
3. Which of the following is the primary blood supply to the cervix?
A) Ovarian artery
B) Uterine artery
C) Internal pudendal artery
D) Superior vesical artery
Rationale: The uterine artery (a branch of the internal iliac artery) provides the
primary blood supply to the cervix, uterus, and upper vagina. The ovarian artery
supplies the ovaries and fallopian tubes. The internal pudendal artery supplies the
external genitalia. The superior vesical artery supplies the bladder.
4. The endocervical canal is lined by which type of epithelium?
A) Stratified squamous epithelium
B) Simple columnar mucin-producing epithelium
C) Transitional epithelium
D) Pseudostratified ciliated columnar epithelium
Rationale: The endocervical canal is lined by a single layer of tall, mucin-
producing columnar cells. The ectocervix is lined by stratified squamous
epithelium. The transformation zone is where columnar epithelium undergoes
squamous metaplasia. The type of epithelium is critical for understanding cervical
cytology morphology.
5. The vaginal mucosa is primarily composed of which type of epithelium?
A) Stratified squamous epithelium (non-keratinized)
B) Simple columnar epithelium
C) Transitional epithelium
D) Pseudostratified columnar epithelium
Rationale: The vaginal mucosa is lined by non-keratinized stratified squamous
epithelium, which is responsive to estrogen. Glycogen produced by these cells is
,metabolized by lactobacilli to lactic acid, maintaining the acidic vaginal pH. The
cervix has both squamous (ectocervix) and columnar (endocervix) epithelium.
SECTION 2: HISTOLOGY & NORMAL CELLULAR MORPHOLOGY
(Questions 6–15)
6. A cytotechnologist is examining a Pap smear and identifies superficial
squamous cells with pyknotic nuclei and abundant transparent cytoplasm. These
cells are most consistent with:
A) Normal superficial squamous cells (estrogen effect)
B) Parabasal cells (atrophy)
C) Endocervical cells
D) Squamous metaplastic cells
Rationale: Superficial squamous cells have small, pyknotic nuclei and abundant,
flat, transparent cytoplasm. They are seen in the mid-cycle (estrogen effect) and
indicate a mature squamous epithelium. Parabasal cells have larger nuclei, less
cytoplasm, and are seen in atrophy (low estrogen). Endocervical cells are
columnar, not squamous. Squamous metaplastic cells have dense cytoplasm and
distinct cell borders. The Histology and Normal Cellular Morphology subtest
comprises 10% of the exam .
7. Which of the following describes the appearance of endocervical cells on a Pap
smear?
A) Large, flat cells with pyknotic nuclei
B) Columnar cells with basally located nuclei and vacuolated cytoplasm, often
in honeycomb or picket-fence arrangements
C) Small round cells with high N:C ratio
D) Multinucleated cells with eosinophilic cytoplasm
Rationale: Endocervical cells are columnar mucin-producing cells. When viewed
en face, they form a honeycomb pattern; when viewed from the side, they form a
picket-fence arrangement. They have basally located nuclei and vacuolated
(mucin-containing) cytoplasm. The presence of endocervical cells documents
sampling of the transformation zone.
, 8. Squamous metaplastic cells in cervical cytology are characterized by:
A) Abundant transparent cytoplasm and pyknotic nuclei
B) Dense, often cyanophilic cytoplasm, distinct cell borders, and round-to-oval
nuclei
C) Elongated nuclei with longitudinal grooves
D) Multinucleation and prominent nucleoli
Rationale: Squamous metaplastic cells are immature squamous cells that arise
from the transformation zone. They have dense, often cyanophilic (blue-green)
cytoplasm, distinct cell borders, and round-to-oval nuclei. They may appear in
sheets or single cells. They are a normal finding in the transformation zone and
should not be confused with dysplastic cells.
9. The presence of at least how many endocervical or squamous metaplastic cells is
required to document a transformation zone component in a cervical cytology
specimen?
A) 5
B) 10
C) 20
D) 50
Rationale: According to the Bethesda System, the transformation zone (TZ)
component is documented when at least 10 endocervical or squamous metaplastic
cells are present on the cytology slide . The presence of a TZ component indicates
adequate sampling of the area at risk for cervical neoplasia. However, the absence
of a TZ component does not make a specimen unsatisfactory for evaluation.
10. Which of the following is a characteristic of parabasal cells?
A) Abundant transparent cytoplasm
B) Relatively large nucleus with a higher N:C ratio than superficial cells,
round-to-oval shape
C) Pyknotic nuclei
D) Honeycomb arrangement
Practice Questions, Answer Rationales, Cervical
Cytology, Screening, Microscopy, Specimen
Evaluation & Laboratory Study Guide
SECTION 1: ANATOMY, PHYSIOLOGY & EMBRYOLOGIC ORIGINS
(Questions 1–5)
1. During embryonic development, the Müllerian (paramesonephric) ducts give
rise to which of the following structures?
A) Ovaries
B) Fallopian tubes, uterus, cervix, and upper vagina
C) Labia majora and minora
D) Clitoris and vestibule
Rationale: The Müllerian ducts develop into the fallopian tubes, uterus, cervix,
and upper two-thirds of the vagina. The ovaries develop from the gonadal ridge
(not Müllerian ducts). The lower third of the vagina, labia, clitoris, and vestibule
develop from the urogenital sinus and external genitalia. The Anatomy,
Physiology, and Embryologic Origins subtest comprises 5% of the CTgyn exam .
2. The transformation zone of the cervix is best defined as:
A) The area of columnar epithelium only
B) The region where columnar epithelium has been replaced by squamous
metaplasia
C) The area of native squamous epithelium
D) The endocervical canal
Rationale: The transformation zone (TZ) is the area between the original
squamocolumnar junction and the new squamocolumnar junction, where columnar
epithelium undergoes squamous metaplasia. This is the site of origin for most
cervical neoplasia. The TZ is the target for cervical cytology sampling and is
,defined by the presence of endocervical or metaplastic cells. The presence of a TZ
component is documented in Bethesda reporting .
3. Which of the following is the primary blood supply to the cervix?
A) Ovarian artery
B) Uterine artery
C) Internal pudendal artery
D) Superior vesical artery
Rationale: The uterine artery (a branch of the internal iliac artery) provides the
primary blood supply to the cervix, uterus, and upper vagina. The ovarian artery
supplies the ovaries and fallopian tubes. The internal pudendal artery supplies the
external genitalia. The superior vesical artery supplies the bladder.
4. The endocervical canal is lined by which type of epithelium?
A) Stratified squamous epithelium
B) Simple columnar mucin-producing epithelium
C) Transitional epithelium
D) Pseudostratified ciliated columnar epithelium
Rationale: The endocervical canal is lined by a single layer of tall, mucin-
producing columnar cells. The ectocervix is lined by stratified squamous
epithelium. The transformation zone is where columnar epithelium undergoes
squamous metaplasia. The type of epithelium is critical for understanding cervical
cytology morphology.
5. The vaginal mucosa is primarily composed of which type of epithelium?
A) Stratified squamous epithelium (non-keratinized)
B) Simple columnar epithelium
C) Transitional epithelium
D) Pseudostratified columnar epithelium
Rationale: The vaginal mucosa is lined by non-keratinized stratified squamous
epithelium, which is responsive to estrogen. Glycogen produced by these cells is
,metabolized by lactobacilli to lactic acid, maintaining the acidic vaginal pH. The
cervix has both squamous (ectocervix) and columnar (endocervix) epithelium.
SECTION 2: HISTOLOGY & NORMAL CELLULAR MORPHOLOGY
(Questions 6–15)
6. A cytotechnologist is examining a Pap smear and identifies superficial
squamous cells with pyknotic nuclei and abundant transparent cytoplasm. These
cells are most consistent with:
A) Normal superficial squamous cells (estrogen effect)
B) Parabasal cells (atrophy)
C) Endocervical cells
D) Squamous metaplastic cells
Rationale: Superficial squamous cells have small, pyknotic nuclei and abundant,
flat, transparent cytoplasm. They are seen in the mid-cycle (estrogen effect) and
indicate a mature squamous epithelium. Parabasal cells have larger nuclei, less
cytoplasm, and are seen in atrophy (low estrogen). Endocervical cells are
columnar, not squamous. Squamous metaplastic cells have dense cytoplasm and
distinct cell borders. The Histology and Normal Cellular Morphology subtest
comprises 10% of the exam .
7. Which of the following describes the appearance of endocervical cells on a Pap
smear?
A) Large, flat cells with pyknotic nuclei
B) Columnar cells with basally located nuclei and vacuolated cytoplasm, often
in honeycomb or picket-fence arrangements
C) Small round cells with high N:C ratio
D) Multinucleated cells with eosinophilic cytoplasm
Rationale: Endocervical cells are columnar mucin-producing cells. When viewed
en face, they form a honeycomb pattern; when viewed from the side, they form a
picket-fence arrangement. They have basally located nuclei and vacuolated
(mucin-containing) cytoplasm. The presence of endocervical cells documents
sampling of the transformation zone.
, 8. Squamous metaplastic cells in cervical cytology are characterized by:
A) Abundant transparent cytoplasm and pyknotic nuclei
B) Dense, often cyanophilic cytoplasm, distinct cell borders, and round-to-oval
nuclei
C) Elongated nuclei with longitudinal grooves
D) Multinucleation and prominent nucleoli
Rationale: Squamous metaplastic cells are immature squamous cells that arise
from the transformation zone. They have dense, often cyanophilic (blue-green)
cytoplasm, distinct cell borders, and round-to-oval nuclei. They may appear in
sheets or single cells. They are a normal finding in the transformation zone and
should not be confused with dysplastic cells.
9. The presence of at least how many endocervical or squamous metaplastic cells is
required to document a transformation zone component in a cervical cytology
specimen?
A) 5
B) 10
C) 20
D) 50
Rationale: According to the Bethesda System, the transformation zone (TZ)
component is documented when at least 10 endocervical or squamous metaplastic
cells are present on the cytology slide . The presence of a TZ component indicates
adequate sampling of the area at risk for cervical neoplasia. However, the absence
of a TZ component does not make a specimen unsatisfactory for evaluation.
10. Which of the following is a characteristic of parabasal cells?
A) Abundant transparent cytoplasm
B) Relatively large nucleus with a higher N:C ratio than superficial cells,
round-to-oval shape
C) Pyknotic nuclei
D) Honeycomb arrangement
