Mammary Gland

Question 1

Horse (Mare)

Answer 1

2 teats with 2 canals each in Inguinal region

Question 2

Sheep (ewe) and goat (doe)

Answer 2

2 teats with 1 canal each in Inguinal region

Question 3

Cow

Answer 3

4 teats with 1 canal each in Inguinal region

Question 4

Pig (sow)

Answer 4

12-14 teats: 2 thoracic, 4 abdominal, 1 inguinal

2-3 canals each

Question 5

Dog (bitch)

Answer 5

8-10 teats: 2 thoracic, 2 abdominal, 1 inguinal

8-12 canals each

Question 6

Cat (queen)

Answer 6

8 teats: 2 thoracic, 2 abdominal

5-7 canals each

Question 7

Describe the suspensory apparatus of the equine

Answer 7

Trick question: no elaborate apparatus, merely loose connective tissue

Question 8

Which arteries supply the teats in the horse? In the cow?

Answer 8

Horse:

1. External pudendal artery
2. Obturator artery

Cow:

1. External pudendal artery
   a. Sigmoid flexure upon entering inguinal canal
   b. Caudal mammary a.
   c. Cranial mammary a.
   
   • becomes Caudal Superficial Epigastric a.
2. Internal pudendal artery

Question 9

Which 2 structures lie just distal to the gland sinus in the cow?

Answer 9

1. Annular fold of mucosa

2. Venous circle

Question 10

Where is the Rosette of Furstenberg located in the cow and what does it contain?

Answer 10

Proximal teat canal (NOT sinus)

Lymphoid cells

Question 11

Describe the attachments of the 4 parts of the suspensory apparatus of the cow udder

Answer 11

1. Lateral lamina - Collagenous
   - Cranial part = lateral crus of superficial inguinal ring
   - Caudal part = symphyseal tendon
2. Medial lamina - Elastic
   - Cranial part = ligament flava via linea alba
   - Caudal part = symphyseal tendon

Question 12

Which 3 lymph nodes drain the bovine udder?

Answer 12

1. Medial iliac
2. Deep inguinal
3. Mammary

Question 13

In the cow, where is the deep inguinal lymph node located? Where is the medial iliac lymph node?

Answer 13

Deep inguinal: b/t Deep Circumflex a. and External Iliac a.

Medial iliac: 2 placements (4 nodes):

1 pair b/t external iliac and internal iliac

1 pair cranial to external iliac, near where it branches off of the caudal mesenteric a.

b/t External Iliac and internal iliac

Question 14

Which 3 nerves provide sensory innervation to bovine udder, and which type of autonomic innervation does the udder receive?

Answer 14

1. L1 and L2
   - Rostral base of udder
2. Genitofemoral n.
   - Most of udder except caudal
3. Mammary br.s of pudendal n.
   - Caudal udder

ANS = Sympathetic only (from caudal mesenteric ganglia)