Histology Practice Questions

Q: Pituicytes are seen in ?

Posterior lobe. ***Posterior lobe*** - **Pituicytes** are specialized glial cells found exclusively in the **posterior pituitary** (neurohypophysis). [1] - They provide structural support and regulation for the nerve terminals that release **antidiuretic hormone (ADH)** and **oxytocin**. [1] *Anterior lobe* - The anterior pituitary, or **adenohypophysis**, consists of glandular epithelial cells that synthesize and secrete various hormones. [2] - It does not contain pituicytes, which are glial cells. [2] *Intermediate lobe* - The intermediate lobe is a rudimentary part of the pituitary gland in humans, primarily producing **melanocyte-stimulating hormone (MSH)**. [1] - While it is part of the pituitary, it does not contain pituicytes. *All of the options* - Pituicytes are specific to the posterior pituitary, so they are not found in all parts of the gland. - Different lobes of the pituitary gland have distinct cellular compositions and functions.

Q: All the following features are seen in neurons from dorsal root ganglia, EXCEPT:

They are multipolar. ***They are multipolar*** - Dorsal root ganglia (DRG) neurons are typically **pseudounipolar**, meaning they have a single process that branches into two (peripheral and central) rather than multiple dendrites and an axon [1]. - **Multipolar neurons** are characteristic of motor neurons and interneurons in the central nervous system, not DRG sensory neurons [1]. *They contain lipofuscin granules* - **Lipofuscin granules** are common in long-lived, post-mitotic cells like neurons and are considered "wear and tear" pigments, accumulating with age. - Their presence in DRG neurons is a normal finding and reflects the neuron's metabolic activity over time. *They have eccentrically located nuclei* - While not universally present in all DRG neurons, an **eccentrically located nucleus** is a common histological feature of certain types of DRG neurons, particularly larger ones. - This feature helps distinguish them from other neuron types and can be accentuated by the large amount of cytoplasm in these cells. *They are derived from neural crest cells* - All sensory neurons of the DRG, along with other components like Schwann cells and sympathetic ganglia, originate from **neural crest cells**. - This developmental origin is a fundamental characteristic of DRG neurons, distinguishing them from CNS neurons derived from the neural tube.

Q: In which stage of cell division is chromosomal study best carried out?

Metaphase. ***Metaphase*** - During **metaphase**, chromosomes are maximally condensed and align at the cell's equatorial plate, making them easily visible and distinguishable under a microscope. - This arrangement allows for clear visualization of **chromosome number**, **size**, and **morphology**, which is crucial for genetic analysis. *Prophase* - In **prophase**, chromosomes begin to condense, but they are still diffuse and not fully compact, making detailed study difficult. - The nuclear envelope is also still present for most of prophase, obstructing a clear view of the chromosomes. *Telophase* - During **telophase**, chromosomes decondense and arrive at opposite poles, becoming less distinct and harder to analyze individually. - New nuclear envelopes form around the separated chromosomes, further obscuring their view for detailed study. *Anaphase* - In **anaphase**, sister chromatids separate and move towards opposite poles, but they are in motion and not aligned, making them difficult to capture and analyze individually. - The separated chromatids are also stretched and elongated, which makes their morphological assessment challenging.

Q: What is the typical length of a human sperm cell?

55 micrometers. ***55 micrometers*** - A typical **human sperm cell** measures approximately **55 micrometers** from the head to the tip of the tail [1]. - This length allows for efficient motility and navigation within the female reproductive tract to reach the ovum [1]. *100 micrometers* - This length is significantly **longer** than the average size of a human sperm cell. - While some cells can achieve this size, it is not typical for **spermatozoa**. *65 micrometers* - Although closer to the actual size, **65 micrometers** is generally considered slightly larger than the average human sperm cell length. - Sperm length is critical for understanding their **mobility** and **fertility** [1]. *50 micrometers* - This measurement is slightly **shorter** than the typical length of a human sperm cell. - The precise length, including the **head** and **flagellum**, contributes to its function.

Q: Which of the following is NOT a glial cell?

Neurons. ***Neurons*** - **Neurons** are the primary cells responsible for transmitting electrical and chemical signals throughout the nervous system [3]. - They are distinctly different from glial cells, which primarily provide **support and protection** to neurons [1]. *Oligodendrocytes* - **Oligodendrocytes** are a type of glial cell found in the **central nervous system** (CNS) [1]. - Their main function is to produce **myelin sheaths** that insulate axons, enhancing the speed of nerve impulse transmission [2]. *Microglia* - **Microglia** are the resident **immune cells** of the central nervous system, acting as its primary form of **active immune defense** [1]. - They scavenge for plaques, damaged neurons, and infectious agents, playing a critical role in neuroinflammation and tissue repair [2]. *Astrocytes* - **Astrocytes** are star-shaped glial cells found in the **brain and spinal cord** [1]. - They perform numerous functions, including providing **nutritional support**, maintaining the **blood-brain barrier**, and regulating the **extracellular environment** by controlling ion concentrations.

Q: Characteristic of protective epithelium is:

High regenerative capacity. ***High regenerative capacity*** - **Protective epithelia**, such as in the skin or lining of the gastrointestinal tract, are constantly exposed to environmental stressors and damage. - Their cells have a high rate of division and replacement, ensuring the **integrity of the barrier function** [1]. *Microvilli* - **Microvilli** are characteristic of epithelia involved in **absorption**, such as those in the small intestine. - They increase the surface area for absorption but are not the primary characteristic of protective epithelia. *Thinness* - **Thin epithelia**, like **simple squamous epithelium**, are adapted for efficient gas exchange or filtration (e.g., in the lungs or kidney glomeruli). - Protective epithelia are often **stratified** and thus thicker to withstand abrasion and provide a robust barrier. *Pinocytic vesicle* - **Pinocytic vesicles** are involved in **fluid and solute uptake** by cells (pinocytosis or "cell drinking"). - While all cells perform pinocytosis, it is not a defining characteristic unique to protective epithelia.

Q: Conjunctival epithelium is a type of what?

Stratified non keratinised squamous. ***Stratified non keratinised squamous*** - The **conjunctival epithelium** is primarily **stratified squamous epithelium**, meaning it has multiple layers of flattened cells. - It is **non-keratinized**, indicating that it does not produce keratin, which helps keep the surface moist and flexible. *Pseudostratified* - **Pseudostratified epithelium** appears to have multiple layers due to the varying heights of cells and nuclei at different levels, but all cells are in contact with the basement membrane. - A common example is in the **trachea**, where it is usually ciliated with goblet cells, not typically found in the conjunctiva. *Stratified columnar* - **Stratified columnar epithelium** has multiple layers of cells, with the outermost layer consisting of columnar cells. - This type of epithelium is relatively rare, found in certain ducts and parts of the urethra, and is not characteristic of the conjunctiva. *Transitional* - **Transitional epithelium**, also known as urothelium, is a specialized stratified epithelium found in the **urinary tract** (e.g., bladder, ureters). - It is unique for its ability to **stretch** and change shape, which is not a primary function of the conjunctival surface.

Q: Transitional epithelium shows maximum distensibility and is the classic teaching example in which of the following structures?

Urinary bladder. ***Urinary bladder*** - **Transitional epithelium (urothelium)** lines the entire urinary tract, but the **bladder** is the **classic teaching example** due to its dramatic distensibility during filling [1]. - The bladder can expand from nearly empty to holding 400-600 mL, requiring epithelium that can stretch significantly while maintaining a protective barrier [2]. - The epithelium appears **thick and multi-layered when empty** (6-8 cell layers) and **thin and stretched when full** (2-3 cell layers), with characteristic umbrella cells on the surface [1]. *Ureter* - The ureter is **entirely lined with transitional epithelium**, but its primary function is **peristaltic transport** rather than storage [1]. - While it does undergo some distension during urine passage, the degree of stretching is far less dramatic than the bladder. - The ureter maintains a more constant diameter and thickness of epithelium compared to the bladder. *Urethra* - The urethra has **transitional epithelium only in its proximal portion** (prostatic urethra in males, initial part in females) [1]. - The majority of the urethra is lined with **stratified columnar** or **stratified squamous epithelium**. - Therefore, urethra is NOT a characteristic location for demonstrating transitional epithelium. *Kidney pelvis* - The renal pelvis and calyces are **entirely lined with transitional epithelium** [1]. - However, they function primarily as **collecting funnels** with minimal distensibility compared to the bladder. - The renal pelvis undergoes far less dramatic volume changes than the bladder during normal function.

Q: Which of the following structures contains subcapsular sinuses?

Lymph node. ***Lymph node*** - The **subcapsular sinus** is the space immediately beneath the capsule of a lymph node, where **afferent lymphatic vessels** drain. [1] - This sinus is the initial site where lymph percolates through the node, allowing surveillance by **immune cells**. *Spleen* - The spleen has a complex vascular structure with **red pulp** (involved in filtering blood) and **white pulp** (immune function), but it lacks subcapsular sinuses. [2] - Its primary function is blood filtration and removal of old red blood cells, not lymph filtration. *Thymus* - The thymus is an organ involved in **T-cell maturation** and does not filter lymph. [2] - It is encapsulated but lacks subcapsular sinuses, as its primary role is not to filter afferent lymph. *Thyroid* - The thyroid gland is an **endocrine gland** responsible for producing hormones, not an immune organ involved in filtering lymph. [3] - It consists of follicles and parafollicular cells and does not possess subcapsular sinuses.

Question 1

Pituicytes are seen in ?

Accepted Answer

Posterior lobe

Answer

Anterior lobe

Answer

Intermediate lobe

Answer

All of the options

Question 2

All the following features are seen in neurons from dorsal root ganglia, EXCEPT:

Accepted Answer

They are multipolar

Answer

They are derived from neural crest cells

Answer

They have eccentrically located nuclei

Answer

They contain lipofuscin granules

Question 3

What are the main types of cells found in the cerebellar cortex?

Accepted Answer

Purkinje cells, granule cells, and molecular layer interneurons

Answer

Glomus cells

Answer

Principal cells

Answer

Intercalated cells

Question 4

In which stage of cell division is chromosomal study best carried out?

Accepted Answer

Metaphase

Answer

Telophase

Answer

Anaphase

Answer

Prophase

Question 5

What is the typical length of a human sperm cell?

Accepted Answer

55 micrometers

Answer

50 micrometers

Answer

100 micrometers

Answer

65 micrometers

Question 6

Which of the following is NOT a glial cell?

Accepted Answer

Neurons

Answer

Oligodendrocytes

Answer

Microglia

Answer

Astrocytes

Question 7

Characteristic of protective epithelium is:

Accepted Answer

High regenerative capacity

Answer

Microvilli

Answer

Thinness

Answer

Pinocytic vesicle

Question 8

Conjunctival epithelium is a type of what?

Accepted Answer

Stratified non keratinised squamous

Answer

Pseudostratified

Answer

Stratified columnar

Answer

Transitional

Question 9

Transitional epithelium shows maximum distensibility and is the classic teaching example in which of the following structures?

Accepted Answer

Urinary bladder

Answer

Ureter

Answer

Urethra

Answer

Kidney pelvis

Question 10

Which of the following structures contains subcapsular sinuses?

Accepted Answer

Lymph node

Answer

Spleen

Answer

Thymus

Answer

Thyroid

Histology — MCQs

Histology — MCQs

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