In biology, a pencil cell refers specifically to a type of erythrocyte (red blood cell) characterized by its elongated shape. It's an ellipsocyte where the major axis is three times longer than the minor axis, resembling the shape of a pencil. These cells are also known as target cells.
Characteristics of Pencil Cells
- Elliptical Shape: The defining feature is its significantly elongated, elliptical form.
- Size Ratio: The length (major axis) is approximately three times the width (minor axis).
- Target Cell Designation: Pencil cells are also categorized as target cells due to their shape and appearance under a microscope.
Significance in Diagnosis
The presence of pencil cells, along with other abnormal red blood cell morphologies like precheratocytes, can be an indicator of certain hematological conditions. Research has explored the diagnostic value of identifying these cells quantitatively to better understand and diagnose specific diseases. For example, a study aimed to evaluate the diagnostic power of detecting precheratocytes and pencil cells. [^1]
[^1]: Research of Pencil Cells and Precheratocyte in Patients with ... https://scholars.direct/Articles/hematology/chr-5-015.php?jid=hematology
It is important to note that the term "pencil cell" in the context of biology is distinct from other uses of "pencil cell" which might refer to illustrations or drawings related to biology (e.g., depictions of cells) or to unrelated technological applications.
