Laboratory 9

Cat Dissection IIRespiratory

Urinary/Reproductive Systems

Lab Schedule for Rest of Semester

• Cat dissection labs– Dissection II (today)

• Human Reproductive Systems (Ex. 50 and 51 in Hole)

• Cat Urinary and Reproductive System (Ex. 58 and 59 in Hole)

• Lab Make up (study) day for Mon/Wed classes– 4/26, MW AM

– 4/28, MW PM

• Lab Exam 2– 5/7, 11:30 am

Organs of the Female Reproductive System

Figure from: Martini, Anatomy & Physiology, Prentice Hall, 2001

(Bartholin’s glands)

(Skene’s glands; lesser vestibular glands)

(In anteflexion)

(Fallopian)

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Ovary Attachments

(Mesentery)

(Retracted)

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Ovaries and Their Attachments

Figure from: Martini, Anatomy & Physiology, Prentice Hall, 2001

Fold of peritoneum that attaches to sides and floor of pelvic cavity (limits side-to-side movement and rotation)

Posterior view

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Male Reproductive System

Figure from: Martini, Anatomy & Physiology, Prentice Hall, 2001

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Male Reproductive Organs

posterior view

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Penis

Male External Reproductive Organs

Figure from: Martini, Anatomy & Physiology, Prentice Hall, 2001

Structure of the Testis

Surrounded by the tunica albuginea – a tough, white, fibrous capsule that encloses each testicle

Septa divide each testicle into about 250 lobules

Each lobule contains 1-4 highly coiled seminiferous tubules that give rise to sperm

Interstitial cells lie in between seminiferous tubules and secrete male sex hormones

Rete Testis

Cat Urinary System• EVERYONE should do the following dissections:

– Visualize the kidneys and ureters in situ and their relationship to the peritoneum

– Dissect away the peritoneum on one side, and isolate the kidneys and ureters, following the ureters as they enter the urinary bladder

• In male cats, visualize the relationship between the ductus deferens and the ureter, being very careful not to tear or cut either one

– Locate the renal artery and vein– Remove one kidney

• Leave a length of renal artery/vein and ureter intact• Make a longitudinal section through the kidney • Visualize the cortex, medulla, renal pelvis, and upper ureter

– Locate the urinary bladder• After draining the bladder if it was full, make a coronal section through the bladder

and visualize the detrusor muscle, trigone, and entrance of the ureters

Cat Reproductive System

• EVERYONE should do the following dissections:

– Female cats• Locate the ovarian and suspensory ligaments• Locate the ovaries, ovarian (Fallopian) tubes• Locate and visualize the horn and body of uterus• Locate and visualize the vagina and its connection to the urethra. • Locate and visualize the urethral orifice, clitoris, and labia majora

– Male cats• Visualize the relationship between the ureters and the vas deferens• Locate the spermatic cord• Dissect away the scrotum to reveal the testes• Dissect away as much tissue as possible to trace the path of the ductus deferens

through the spermatic cord into the abdominal cavity• Locate the penis, and dissect away as much skin as possible to reveal its internal

structure

Cat Dissection Lab Today• Do the following in Hole’s Lab Manual

BEFORE you start the cat reproductive system dissection– Read Exercise 50 (Human Male)– Read Exercise 51 (Human Female)

• Once you are generally familiar with the human reproductive structures– Exercises 58,59 (Cat urinary and reproductive systems)

• Be sure to look at torso model and individual reproductive systems models for both male and female

• Don’t rush your dissection!