cat dissection a laboratory guide · 5/24/2013 · 2 cat dissection anterior (cephalad) posterior...
TRANSCRIPT
CAT DISSECTIONA LABORATORY GUIDE
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P R E F A C E
A. Preparing the Cat
1. With gloves on, remove the cat from its bag and laythe cat on a dissecting tray. Keep any liquid preserv-ing solution that remains in the bag.
2. Review the directional terms for the cat in FigureCP.1. Note the differences between four-leggedanimals and humans.• Anterior is toward the cephalic (head) end of the
cat• Posterior is toward the caudal (tail) end of the cat• Superior is toward the dorsal (back) surface• Inferior is toward the ventral (belly) surface
2 C a t D i s s e c t i o n
Anterior(cephalad)
Posterior(caudal)
Superior(dorsal)
Inferior(ventral)
3. Place your cat ventral surface up on the dissectingtray.
4. Identify the gender of your cat. Males have a scrotumand a prepuce, a small mound anterior to the scrotumin which the penis is located. Females have a urogeni-tal aperture, an opening located anterior to the anusthat is a common passageway for the urinary andreproductive systems. Four or five teats (nipples) arepresent on both male and female cats. Be able toidentify both sexes externally.
5. Prepare a label for your cat with the names of yourgroup members and the gender of your cat.
6. Follow the instructions for skinning the cat if you aredissecting skeletal muscles, or the instructions foropening the ventral body cavities if you are dissectingan organ system.
F I G U R E C P. 1 Directional terminology for the cat.
Incision line
(b) Opening ventral body cavities
(a) Incisions for skinning
Diaphragm
F I G U R E C P. 2 Cat incisions.
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C a t D i s s e c t i o n 25
Thyroid glandTrachea
Thymus
Pancreas
Testis ( )
Adrenal gland
Kidney
Ovary ( )
F I G U R E C 3 . 1 Endocrine organs, ventral view.
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C a t D i s s e c t i o n 33
Heart
Medial lobe
Mediastinal lobe
Posterior lobe
Anterior lobe
Trachea
Left lung:Right lung:
Thyroid gland
Thyroidcartilage
Anterior lobe
Mediallobe
Posteriorlobe
Diaphragm
Ventral view
F I G U R E C 6 . 1 Respiratory system, ventral view.
Heart
Right lung:
Medial lobe
Anterior lobe
Mediastinal lobe
Posterior lobe
Epiglottis of larynxThyroid cartilageof larynx
Thyroid gland
Trachea
Thymus
Left lung:
Medial lobe
Posterior lobe
Diaphragm
Anterior lobe
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36 C a t D i s s e c t i o n
Gallbladder
Greateromentum
(a) Ventral view
Diaphragm
Lobes of liver
Stomach
Spleen
Gallbladder
Greater omentum
Diaphragm
Lobes of liver
Stomach
Spleen
F I G U R E C 7. 2 a Digestive organs, superficial.
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C a t D i s s e c t i o n 37
Ileum
Cecum
Stomach
Lobes of liver
Diaphragm
Ileocecal junction
Jejunum
Mesentery
Lesser omentum
Gallbladder
Pyloric valve
Duodenum of small intestinePancreas
Urinary bladder
(b) Ventral view
Ileum
Cecum
Stomach
Lobes of liverDiaphragm
Ileocecal junction Jejunum
Mesentery
Lesser omentum
Gallbladder
Pyloric valve
Duodenum
Pancreas
Urinary bladder
Urethra
F I G U R E C 7. 2 b Digestive organs, deep.
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C a t D i s s e c t i o n 39
Inferiorvena cava
Abdominalaorta
Vas deferens
Spermatic cord
Scrotumwith testis
Left kidney(sectioned)
Left ureter
Urinarybladder
Urethra
Epididymis
Penis
Left kidney (sectioned)
Left ureter
Urinary bladder
Urethra
Penis
Ventral view
Vas deferens
Inguinal canal
Spermaticcord
Scrotum withtestis
F I G U R E C 8 . 1 a Male urinary and reproductive organs.
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42 C a t D i s s e c t i o n
Ovary
Right horn of uterus
Right ureter
Urinary bladder
Urethra
Urogenital sinus
Ovarian ligament
Left hornof uterus
Body of uterus
Left kidney
Vagina
Ovary Ovarian ligament
Left horn of uterus
Body of uterus
Ventral view
Left kidney (sectioned)
Ovarian vein
Vagina
Right uterine horn
Right ureter
Urinary bladderUrethra
Urogenital sinus
F I G U R E C 8 . 1 b Female urinary and reproductive organs.
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