II. The larynx ([p. 246]). (1) Read the description, studying the cartilages ([p. 247]) on a preparation ([Fig. 104]). Then very carefully remove the pharynx and its constrictor muscles, the sternothyroid and remains of sternohyoid muscles, and (2) dissect the muscles of the larynx ([p. 249], and [Fig. 105]). Dissect all those of one side first. The mucosa lining the vestibule and middle portions of the laryngeal cavity must be removed. After studying the muscles, remove the muscles and entire mucosa by scraping carefully with a dull but smooth scalpel, and study the cartilages ([Fig. 104]).
III. The trachea and lungs ([p. 251], and [Fig. 106]). The distal end of the trachea and lungs may now be removed with the heart from the body. The lungs may be inflated with the bellows. The bronchi should then be exposed, cleaned, and followed as far as possible into the lungs. The heart should be preserved for future study.
DISSECTION OF THE UROGENITAL ORGANS.
A. Excretory Organs.
1. Expose the kidney ([p. 255], and [Fig. 108]) by removal of the peritoneum and the surrounding fat, taking care not to open the capsule of the kidney. In removing the fat from the cranial end do not injure the suprarenal body ([p. 257]), which should be studied.
2. Open the capsule of the kidney and slice away its ventral wall to expose the sinus. After dissecting the contents of the sinus open the pelvis and study the papilla. Pass a bristle from the pelvis into the ureter.
3. Make a median section of the kidney parallel to its ventral surface and study structure ([Fig. 109]).
4. Trace the ureter to the bladder, being careful not to injure the vas deferens. Study the bladder and its ligaments, structure of its wall, etc. Pass a bristle through the ureter into it and then open it to see the openings of the ureter. Trace the neck of the bladder to the pubis.
B. Male Genital Organs.
1. Study the external genital organs ([p. 257]).