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Sertoli Cell Organization
MCQ questions and answers.
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MCQ Questions
1. Which structural arrangement of Sertoli cells is primarily responsible for dividing the seminiferous epithelium into basal and adluminal compartments?
A.
Tight junctions between adjacent Sertoli cells in the basal region
B.
Desmosomes connecting Sertoli cells directly to Leydig cells
C.
Gap junctions between spermatids and the basement membrane
D.
Hemidesmosomes linking germ cells to peritubular myoid cells
Correct Answer:
Tight junctions between adjacent Sertoli cells in the basal region
Explanation:
Adjacent Sertoli cells form specialized tight junctions near their basal portions. These junctions create the blood-testis barrier and separate basal spermatogonia from more advanced germ cells in the adluminal compartment.
2. A developing germ cell must cross the blood-testis barrier during progression toward the lumen. Which Sertoli-cell event most directly permits this movement while maintaining compartmental separation?
A.
Permanent dissolution of all Sertoli-Sertoli junctions
B.
Coordinated restructuring of Sertoli junctional complexes ahead of the migrating germ cell
C.
Detachment of Sertoli cells from the basal lamina
D.
Replacement of tight junctions by Leydig-cell processes
Correct Answer:
Coordinated restructuring of Sertoli junctional complexes ahead of the migrating germ cell
Explanation:
Sertoli cells dynamically reorganize their junctional complexes as germ cells move from the basal to the adluminal compartment. This preserves the barrier while allowing controlled passage.
3. Which description best represents the organization of a mature Sertoli cell within a seminiferous tubule?
A.
A small, rounded cell restricted to the interstitial tissue
B.
A tall epithelial cell extending from the basement membrane toward the lumen
C.
A flattened cell forming the outer wall of the seminiferous tubule
D.
A multinucleated cell located exclusively among Leydig cells
Correct Answer:
A tall epithelial cell extending from the basement membrane toward the lumen
Explanation:
Sertoli cells are elongated supporting cells that span much of the seminiferous epithelium, with basal regions near the basement membrane and apical processes extending toward the lumen.
4. The irregular outline of Sertoli cells in histological sections is mainly explained by which feature of their organization?
A.
Their extensive cytoplasmic processes surrounding developing germ cells
B.
Their fusion into a continuous syncytium with Leydig cells
C.
Their confinement to the narrow interstitial spaces between tubules
D.
Their lack of contact with neighboring cells
Correct Answer:
Their extensive cytoplasmic processes surrounding developing germ cells
Explanation:
Sertoli cells possess broad and branching cytoplasmic extensions that envelop and support germ cells at different stages, producing an irregular cell profile.
5. Which pairing correctly matches a Sertoli-cell region with its principal anatomical relationship?
A.
Basal region — adjacent to the basement membrane and basal germ cells
B.
Basal region — directly surrounding the lumen and released spermatozoa
C.
Apical region — embedded in the interstitial tissue between seminiferous tubules
D.
Apical region — attached exclusively to peritubular myoid cells
Correct Answer:
Basal region — adjacent to the basement membrane and basal germ cells
Explanation:
The basal portion of each Sertoli cell lies near the basement membrane and contacts early germ cells. Its apical extensions project toward the lumen and interact with later-stage germ cells.
6. Why are Sertoli cells considered the structural organizers of the seminiferous epithelium?
A.
They form a supporting framework that positions germ cells in successive compartments
B.
They replace every germ cell after meiotic division
C.
They form the muscular wall responsible for tubule contraction
D.
They occupy only the interstitial region and separate neighboring tubules
Correct Answer:
They form a supporting framework that positions germ cells in successive compartments
Explanation:
Sertoli cells extend across the seminiferous epithelium, surround germ cells with cytoplasmic processes, and establish basal and adluminal compartments through specialized cell junctions.
7. A lesion selectively disrupting Sertoli-Sertoli tight junctions would most directly impair which organizational feature of the seminiferous epithelium?
A.
The separation of basal and adluminal germ-cell compartments
B.
The attachment of Leydig cells to the tunica albuginea
C.
The formation of the outer peritubular contractile layer
D.
The connection of sperm flagella to the epididymal epithelium
Correct Answer:
The separation of basal and adluminal germ-cell compartments
Explanation:
Sertoli-Sertoli tight junctions form the blood-testis barrier, which establishes the boundary between basal and adluminal compartments within the seminiferous epithelium.
8. Which cellular relationship is most characteristic of Sertoli-cell organization during spermatogenesis?
A.
Developing germ cells are partially embedded within Sertoli-cell cytoplasm
B.
Developing germ cells are isolated from Sertoli cells by a continuous basement membrane
C.
Developing germ cells are enclosed only by Leydig-cell cytoplasm
D.
Developing germ cells remain attached exclusively to the lumen-facing surface
Correct Answer:
Developing germ cells are partially embedded within Sertoli-cell cytoplasm
Explanation:
Sertoli-cell cytoplasmic processes surround and partially enclose developing germ cells, providing the organized cellular environment characteristic of the seminiferous epithelium.
9. Which change in Sertoli-cell junctional organization would allow a preleptotene germ cell to enter the adluminal compartment without creating a lasting breach in the barrier?
A.
Formation of a new junction below the germ cell as an older junction is remodeled above it
B.
Complete removal of all junctions from the entire seminiferous epithelium
C.
Displacement of the basement membrane into the tubular lumen
D.
Fusion of the germ cell with a neighboring Leydig cell
Correct Answer:
Formation of a new junction below the germ cell as an older junction is remodeled above it
Explanation:
During germ-cell translocation, Sertoli cells can establish new junctional contacts while remodeling existing ones. This coordinated organization maintains the blood-testis barrier during passage.
10. Which observation would most strongly indicate that Sertoli cells, rather than peritubular cells, are forming the principal intratubular support framework?
A.
Cells extend from the basal lamina around germ cells toward the lumen
B.
Cells are restricted to the outer surface of the tubule and contain contractile filaments
C.
Cells occur in clusters between seminiferous tubules and contain abundant lipid droplets
D.
Cells line blood vessels outside the testicular cords
Correct Answer:
Cells extend from the basal lamina around germ cells toward the lumen
Explanation:
Sertoli cells are intratubular, vertically elongated support cells that extend from the basal lamina toward the lumen and organize germ cells through their cytoplasmic processes.
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