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Related Concept Videos

Assessment of the Rectum and Anus01:25

Assessment of the Rectum and Anus

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Evaluating the rectum and anus plays a crucial role in conducting a thorough physical examination of the gastrointestinal system. Although it may be uncomfortable and often embarrassing for the patient, it holds immense diagnostic value, particularly in detecting gastrointestinal diseases and abnormalities. This guide will explain how to perform this assessment using inspection and palpation methods.
Rectal Inspection
Begin by inspecting the perianal and anal areas for color, texture, rashes,...
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Muscles of the Pelvic Floor and Perineum01:26

Muscles of the Pelvic Floor and Perineum

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The muscles of the pelvic floor and perineum are crucial for supporting the pelvic organs, controlling continence, and aiding in sexual function, childbirth, and core stability. They are typically divided into the superficial perineal layer and the deep pelvic floor layer.
Perineal Layer
The perineum is a diamond-shaped area below the pelvic diaphragm, divided into an anterior urogenital triangle that contains the external genitals and a posterior anal triangle housing the anus. The urogenital...
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Large Intestine01:09

Large Intestine

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The large intestine is divided into three main regions: the cecum, colon, and rectum. Extending from the ileocecal valve to the anus, it frames the small intestine on three sides.
The ileocecal sphincter, a mucous membrane fold, guards the opening from the ileum to the large intestine. This valve permits material from the small intestine to pass into the large intestine. Attached to the ileocecal valve is the cecum. This small pouch, approximately 6 cm long, has a twisted, coiled tube known as...
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Spinal Nerves: Plexus II01:21

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The plexuses of the lower body include the lumbar, sacral, and coccygeal plexuses, which innervate the abdomen, pelvis, legs, and coccygeal region. These plexuses control the transmission of sensory information and coordinate motor functions of the lower body.
The Lumbar Plexus
The lumbar plexus is situated within the lumbar region of the back and is primarily formed by the first four lumbar spinal nerves (L1 to L4). This plexus extends its branches into several nerves, including the...
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Appendicitis01:19

Appendicitis

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Appendicitis is an acute inflammatory condition of the vermiform appendix, most commonly caused by obstruction of its lumen. The appendix is a narrow, blind-ended pouch that extends from the cecum, making it particularly prone to obstruction. Causes include fecaliths, lymphoid hyperplasia (often after viral infections), parasites, tumors, or foreign bodies. This obstruction initiates a cascade of pathological changes.Luminal Obstruction and Early InflammationAfter obstruction, normal mucosal...
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Abdominal Regions and Quadrants01:19

Abdominal Regions and Quadrants

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To promote clear communication, for instance, about the location of a patient's abdominal pain or a suspicious mass, anatomists and clinicians typically use imaginary lines to categorize the abdominopelvic cavity into either four quadrants or nine regions to identify organs in the cavity.
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Related Experiment Video

Updated: Apr 21, 2026

Transvaginal Mesh Insertion in the Ovine Model
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Umbilical pilonidal sinus.

Ghulam Mustafa, Ghulam Akber, Junaid Khan Lodhi

    Journal of Ayub Medical College, Abbottabad : JAMC
    |November 1, 2014
    PubMed
    Summary
    This summary is machine-generated.

    A pilonidal sinus is a hair-filled abscess typically found in the lower back. This case report highlights a rare occurrence of a pilonidal sinus in the umbilical region of a young boy.

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    Area of Science:

    • Dermatology
    • General Surgery

    Background:

    • Pilonidal sinus is a condition characterized by a tract lined with granulation tissue leading to a cystic cavity.
    • Typically located in the sacro-coccygeal region, pilonidal sinuses can also manifest in other areas due to hair embedding beneath the skin.

    Observation:

    • The formation of sinuses is initiated by friction, causing hair to embed and form small cavities or pits.
    • These cavities can enlarge into sinuses, becoming susceptible to bacterial and debris entry, leading to inflammation and abscess formation.

    Findings:

    • The abstract describes a case report focusing on an umbilical pilonidal sinus in a young boy.
    • This presentation is unusual, as pilonidal sinuses most commonly occur in the sacro-coccygeal area.

    Implications:

    • This case broadens the understanding of pilonidal sinus presentation and location.
    • Highlights the importance of considering atypical locations for diagnosis and treatment.