Mammy Gland Flashcards
What is the mammary tissue locations of carnivores, pigs, primates, ruminants, and horses?
Thoracic to inguinal: carnivores, pigs
Thoracic: primates
Inguinal: ruminants, horses
Mammary tissue start as buds and grow into?
Ectodermal ridges
In the fetus, when do mammary buds develop? And when do ducts start forming?
Mammary buds: 75 days gestation
Ducts: 100 days gestation
At birth what 3 aspects of the mammary are developed/present?
Teats
Rudimentary duct
Canalized secondary ducts
During early gestation, what part of the cows mammary tissue develops?
Ductal growth and development
What 3 changes do we see in the mammary tissue of a cow at mid gestation?
Cistern growth (5-6 months)
Gland proliferation (5-7 months)
Secretory tissue replaces adipose tissue
What 2 changes do we see in the mammary tissue of a cow at late (6-9 months) gestation?
Secretory tissue, vascular and lymphatic proliferation
Secretory activity starts at 9 months
How many teats and ducts per teat do pigs have?
~ 14 teats 2 ducts per gland
How many teats and ducts per teat do dogs have?
10 teats with (4-12 ducts per gland)
How many teats and ducts per teat do cats have?
8 teats and 4-12 ducts/gland
How many teats and ducts per teat do primates have?
2 teats with ~16 ducts/teat
How many teats and ducts per teat do cows have?
4 teats with 1 duct per teat
How many teats and ducts per teat do sheep have?
2 teats and 1 duct per gland
How many teats and ducts per teat do horses have?
2 teats with 2 ducts per gland
What do you call it when an animal has an extra teat?
Supernumerary teat or accessory teat
What are 2 lymph nodes associated with the mammary tissue?
Prefemoral/precrural lymph nodes and supramammary lymph node
What veins are associated with the mammary tissue?
External and internal pudendal veins
Perineal vein
Superficial abdominal “milk” vein
What nerves innervate the bulk of gland and teats?
L3 & 4 genito-femoral (somatic and autonomic)
What nerve innervates the caudal surface teats for superficial sensation?
S2 & 3 (pudendal)
What makes up the suspensory apparatus?
Medial and lateral laminae
How many litres of blood flow is required per litre of milk?
500 L
What is one major cause of enlargement of the supramammary lymph node?
Mastitis
Anastomoses of what 2 things are associated with milk vein development?
Cranial and caudal superficial epigastrics
Can you use the milk vein for vascular access?
No never!!!
