Male Reproductive Systems & Pathology Physiology Direct Notes

Prostatic Urethra Location

Passes directly through the center of the prostate gland.

Prostate Pathology Impact on Urethra

BPH and prostate cancer compress the prostatic urethra, causing obstruction.

Bladder Voiding Force Formula

Force = Pressure × Area (F = P × A).

Bladder Force Loss Mechanism

Incomplete emptying reduces surface area, decreasing force generated on subsequent voids.

Obstructive Voiding Symptoms

Hesitancy, weak stream, and interrupted urine stream.

Normal Bladder Capacity

~400 mL.

Pathophysiology of Retained Urine

Allows bacterial proliferation, causing lower urinary tract infection (UTI) symptoms.

Normal Prostate Texture on DRE

Firm and rubbery.

Pathologic Prostate Texture on DRE

Hard and nodular.

Epispadias

Congenital urethral malformation that is surgically correctable.

Epispadias Repair Requirement

Foreskin must be available at the time of surgical repair.

Balanitis Management

Treated primarily with proper hygiene.

Paraphimosis Pathophysiology

Forceful retraction of phimotic foreskin collapses arterial supply to distal penis.

Paraphimosis Complications

Ischemic necrosis and desquamation of distal penile tissue.

Paraphimosis Presentation

Presents as a painful erection.

Paraphimosis Iatrogenic/Traumatic Causes

Accidental trauma or unreduced foreskin after Foley catheter insertion.

Paraphimosis Definitive Treatment

Circumcision.

Syphilitic Ulcer Swab Finding

Darkfield microscopy reveals Treponema pallidum.

Syphilitic Ulcer Natural Course

Spontaneously heals within a few weeks.

Penile Carcinoma Ulcer Swab Finding

Shows malignant squamous cells on cytology/biopsy.

Penile Carcinoma Ulcer Progression

Progressively worsens without spontaneous resolution.

Penile Ulcer Differential: Pain

Both syphilitic chancres and early squamous cell carcinoma are usually painless.

Bowen Disease: Keratin Excess

Dysplastic cells produce excess keratin, causing leukoplakia.

Bowen Disease: Cause of Erythema

Immune system response attacking dysplastic epidermal lesions.

Bowen Disease Management

Ablation of dysplastic tissue.

Bowen Disease Progression Risk

10% of untreated cases progress to invasive squamous cell carcinoma.

Invasive Penile SCC Presentations

Diffusely infiltrating lesion, verrucous/warty mass, or clean moist ulcerative mass.

Normal Epidermal Layers (Deep to Superficial)

Basement membrane, dermis, stratum basalis, epidermis.

Stratum Basalis Keratinocyte Appearance

Immature keratinocytes that appear corded together.

Keratinocyte Maturation Changes

Cells spread out and N/C ratio declines as they migrate upward.

Bowen Disease Histology: Cell Morphology

Crowded immature cells with marked pleomorphism.

Bowen Disease Histology: Architecture

Complete loss of normal architectural organization.

Bowen Disease Histology: N/C Ratio

High nuclear-to-cytoplasmic (N/C) ratio.

Bowen Disease Histology: Mitoses

Loss of proliferative control with presence of tripolar mitotic figures.

Bowen Disease Distinguishing Feature

Absence of local basement membrane invasion (carcinoma in situ).

Tunica Albuginea Function

Fibrous capsule that protects testicular parenchyma.

Epididymis Function

Structure atop the testicle responsible for sperm storage and maturation.

Seminiferous Tubules Role

Site of spermatogenesis within the testicle.

Leydig Cells Location

Interstitial space between seminiferous tubules.

Leydig Cells Function

Produce androgens (testosterone) in response to LH stimulation.

Germinal Epithelium Components

Sertoli cells and developing spermatogonia.

Sertoli Cells Function

Nursing cells that support and nourish developing sperm to maturity.

Spermatogonia Development

Present at various maturation stages within the germinal epithelium.

Sperm Chromosome Set

Monoploid (haploid).

Sperm Metabolic Survival

Cannot survive independently due to lacking sufficient metabolic genetic material.

Myoid Cells Role

Rhythmic contractions move immotile sperm through seminiferous tubules.

LH Alternative Name in Males

Interstitial cell-stimulating hormone (ICSH).

LH Action in Males

Stimulates Leydig cells to produce androgen hormones.

FSH Alternative Name in Males

Follitropin.

FSH Action in Males

Drives spermatogenesis in seminiferous tubules.

Scrotal Temperature Rationale

Spermatogenesis requires temperatures cooler than core body temperature.

Cryptorchidism Patient Education

Teach regular testicular self-examinations due to elevated cancer risk.

Acute Bacterial Orchitis Demographics

Frequently observed in elderly nursing home populations.

Chronic Orchitis Etiology

Follows viral infection or atypical bacterial infection.

Mumps Orchitis Complication

Testicular atrophy leading to reduced fertility or infertility.

Seminoma Peak Incidence Age

40-50 years old.

Nonseminoma Peak Incidence Age

20-30 years old.

Embryonal Carcinoma Resection Feature

Resection margins are frequently marked with dark/black tissue.

Germ Cell Tumor Secreted Markers

Human chorionic gonadotropin (hCG) and alpha-fetoprotein (AFP).

Testicular Teratoma Endocrine Complication

Can trigger thyrotoxicosis due to ectopic thyroid tissue.

Germ Cell Tumor Marker Clinical Use

Monitoring treatment efficacy and recurrence (not for population screening).

Hyperplasia Definition (Prostate)

Cellular-level proliferation increasing total cell count.

Hypertrophy Definition (Prostate)

Gland-level gross enlargement of tissue size.

Cystogram in BPH

Contrast imaging outlining bladder boundaries and shape changes from obstruction.

Alpha-1 Antagonists Mechanism (BPH)

Relaxes smooth muscle of prostate and bladder neck (e.g., tamsulosin).

5-Alpha-Reductase Inhibitors Mechanism

Blocks conversion of testosterone to DHT (e.g., finasteride).

5-Alpha-Reductase Inhibitor Side Effect

Gynecomastia due to altered androgen balance.

TURP Procedure

Transurethral Resection of the Prostate; surgical intervention for BPH.

Prostatitis Antibiotic Challenge

Prostate acts as a 'sanctuary tissue' with poor antibiotic penetration.

Prostate Gross Anatomical Regions

Superior, inferior, anterior, and posterior regions.

Periurethral Zone Location

Immediately surrounds the prostatic urethra.

Transitional Zone Pathology

Primary site where Benign Prostatic Hyperplasia (BPH) develops.

Central Zone Location

Surrounds the ejaculatory ducts.

Peripheral Zone Pathology

Primary site where most prostate adenocarcinomas arise.

Corporation Amylacea Definition

Inspissated prostatic secretions, also called 'prostate sand'.

Corpora Amylacea Histologic Significance

Normal benign finding used to contrast against adenocarcinoma.

Prostate Adenocarcinoma Histology

Crowded, stroma-poor glands lacking corpora amylacea.

PSA Screening Baseline Recommendation

Recommended to begin screening at age 40.

Prostatic Urethra Compression Result

Increased bladder outlet resistance and obstructive voiding.

Bladder Compensatory Mechanism in Obstruction

Generates increased detrusor force to overcome urethral closure pressure.

Hesitancy Mechanism in BPH

Bladder struggles to generate pressure exceeding urethral resistance.

Urinary Stasis Complication in Male Outlet Obstruction

Bacterial proliferation leading to cystitis and lower UTI.

Posterior Prostate Exam Accessibility

Palpated directly via Digital Rectal Exam (DRE).

Epispadias Management Pre-Op Note

Foreskin must not be circumcised, as it is needed for repair.

Balanitis Definition

Inflammation of the glans penis, often managed with hygiene.

Paraphimosis vs Phimosis Medical Emergency

Paraphimosis is a vascular emergency requiring immediate intervention.

Syphilitic vs Malignant Penile Lesion Healing

Syphilis heals spontaneously; carcinoma progressively grows.

Leukoplakia Etiology in Bowen Disease

Excessive keratin production from dysplastic epidermal cells.

Risk of Inaction in Bowen Disease

Progression from in situ dysplastic lesion to invasive SCC.

Verrucous Penile Mass Differential

Invasive squamous cell carcinoma variant.

Normal Epidermis N/C Ratio Pattern

High N/C ratio at basal layer, declining as cells mature upward.

Tripolar Mitotic Figures Significance

Pathognomonic marker of malignant dysplastic cell division.

Testicular Parenchyma Protection

Encapsulated and safeguarded by the tunica albuginea.

Sperm Maturation Site

Epididymis.

Interstitium of Testis Functions

Contains Leydig cells that synthesize testosterone.

Sertoli Cell Alias

Nursing cells.

Monoploid Gametes Vulnerability

Lack full metabolic gene complement, limiting independent survival.

Sperm Movement Mechanism in Tubules

Propelled by contraction of myoid cells.

ICSH Target Cell

Leydig (interstitial) cells in testicles.

Follitropin Target Process

Stimulates spermatogenesis within germinal epithelium.