Lab 24: Avian Anatomy Flashcards
T or F: birds don’t have sweat glands
T
fx of uropygial gland papilla
has sebaceous secretion that is spread to feathers during preening
triceps brachii is supplied by which nerve?
radial
sciatic n. lies deep to which muscle?
biceps femoris
T or F: birds don’t have a diaphragm
T
what is a crop?
right-sided outpocketing of the esophagus near the thoracic inlet
Which is larger: the L or R jugular vein in the bird?
R jugular vein
Which 2 veins are commonly used for venipuncture in birds?
brachial vein, cutaneous ulnar (wing) vein
T or F: bird kidneys are multi-lobed
T
T or F: birds don’t have a urinary bladder or urethra
T
How does the venous circulation in the hindquarters differ in birds vs. mammals?
Birds use a “renal portal system” which sends blood percolating through the kidney before returning to the heart through the vena cava
3 parts of the cloaca
coprodeum, urodeum, proctodeum
Why are the spermatic cord and tunica vaginalis absent in birds?
The testes do not descend; they remain at their abdominal origin. There are also no accessory glands or urethra
What is caponization?
removal of testes a bird. Facilitates fattening and improves meat quality
phallus
copulatory organ located in the ventral tip of the vent. Form a groove for the passage of sperm when engorged with lymph
describe the oviduct of the bird
- represents the entire genital tract from the ovary to the cloaca
- reduced in length during moulting
- usually only develops on the left side
- has 5 sections
5 sections of the oviduct of a bird
1) infundibulum
2) magnum
3) isthmus
4) uterus
5) vagina
shortest segment of the oviduct of a bird
infundibulum. It is fluted and thin-walled and the oocyte passes through it in about 15 mins.
longest segment of the oviduct of a bird? What does it produce?
magnum. It is highly coiled and its mucosa secretes about half of the total albumin to the egg over a period of 3 hrs
What does the isthmus secrete?
albumin and shell membranes
What does the uterus secrete?
hard calcareous shell of the egg
Where does the vagina begin and end? Describe the fx of the vagina in a bird during laying.
Begins at a uterovaginal sphincter and opens on the lateral wall of the urodeum. During laying, protrudes through the vent to minimize contact with feces.
