Peyer's patches are present in

ESIC Nursing Officer-7July 2024

Applied Anatomy

Easy

Appeared in: ESIC Nursing Officer-7July 2024

Explanation

Peyer's patches are large aggregations of lymphatic nodules, a key component of Gut-Associated Lymphoid Tissue (GALT).
They are most numerous and prominent in the ileum, the final section of the small intestine.
Their primary role is immune surveillance of the intestinal lumen, identifying and neutralizing pathogens before they can cross the intestinal wall.

Option A: The stomach's mucosa is characterized by gastric glands that secrete acid and enzymes for digestion, not large lymphoid aggregates like Peyer's patches.
Option B: The duodenum's key histological feature is the presence of Brunner's glands in the submucosa, which secrete alkaline mucus. It does not contain Peyer's patches.
Option C: The jejunum is the primary site for nutrient absorption, characterized by long, finger-like villi and prominent circular folds (plicae circulares). While it has lymphoid tissue, it lacks the large, aggregated Peyer's patches found in the ileum.

Visual 1: Diagram - A cross-section of the small intestine wall, specifically the ileum, clearly showing the large, aggregated lymphatic follicles (Peyer's patch) in the submucosa and lamina propria.
Visual 2: Comparison Chart - A chart illustrating the key histological differences between the duodenum, jejunum, and ileum, highlighting Brunner's glands, villi length, and the presence of Peyer's patches.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomical location and function of Peyer's patches as background academic context rather than a clinical decision trigger.
Peyer's patches are the primary site of invasion for Salmonella typhi, the bacterium causing typhoid fever. This leads to inflammation and potential ulceration in the terminal ileum.
A nurse monitoring a patient with typhoid fever must be vigilant for signs of intestinal perforation, a life-threatening complication. Sudden severe abdominal pain, rigidity, and signs of shock can indicate perforation at the site of a necrotic Peyer's patch.
What if? If a patient had a compromised immune system (e.g., due to HIV or immunosuppressant drugs), the function of Peyer's patches would be impaired, increasing their susceptibility to various intestinal infections, not just typhoid.

How to Approach the Question

First, identify the key term in the question: 'Peyer's patches'.
This is a factual recall question requiring knowledge of the histology of the gastrointestinal tract.
Mentally review the distinct features of each section of the GI tract listed in the options.
Recall that the stomach is for digestion (acid/enzymes), the duodenum neutralizes acid (Brunner's glands), and the jejunum is for absorption (long villi).
Associate Peyer's patches, the large lymphoid aggregates for immune function, with their primary location in the ileum.

Concept Tested & Keywords

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