TOPIC 23B Mammary gland, blood supply and innervation

Question 1

what is a mammary gland

Answer 1

modified sweat gland of exocrine and tubuloalveolar type

Question 2

what does a complex consist of

Answer 2

body (corpus) and teat (papilla)

Question 3

what does mammary body consist of

Answer 3

glandular and dense ct

Question 4

what do units end as

Answer 4

ducts with species specific arrangement

Question 5

components of the duct system

Answer 5

glandular alveolus

ductus lactiferi and sinus lactiferi

Question 6

what does glandular alveolus do

Answer 6

produces milk

Question 7

what does sinus lactiferi consist of

Answer 7

gland sinus and teat sinus

Question 8

system of drainage

Answer 8

1. intralobular ducts drain lobuli glandulae mammari
2. joins to larger interlob duct - drians multiple intra lobulares
3. leads to lactiferous ducts which drain the mammary lobe

Question 9

name 5 parts of suspensory apparatus

Answer 9

1. external fascia of trunk supt and deep
2. lamina lateralis - dense CT
3. lamina medialis - elastic tissue
4. lamellae suspensoriae - bw mammary complexes
5. sulcus intermammarias

Question 10

blood supply

Answer 10

1. a. epigast cran supf
2. a. epigast caud supf
3. a. thoracica interana
4. a. thoracica lat (ca, sus)

Question 11

which arteries make up the thoracic and cranial abdominal complex

Answer 11

a epigastrica cran supf and a thoracica interna

Question 12

which artery is known as the ‘milk vein’

Answer 12

a epigastrica caud supf

Question 13

which artery is only for ca and swine

Answer 13

a thoracica lateralis

Question 14

which nerves innervate the mammary glands (5)

Answer 14

Nn intercostalis
n iliohypogastric
n genitofemoralis
n ilioinguinale
n pudenda

Question 15

which lymphnodes are present at mammary glands

Answer 15

ln axillaris
ln medial iliac
ln inguinalis supf

Question 16

what is responsible for initiating and maintaining lactation

Answer 16

the neurohormonal reflex arc

Question 17

what does suckling stimulate

Answer 17

sensory nerves which conduct impulses to the CNS and tell the hypothalamus to produce oxytocin

Question 18

where is oxytocin released through

Answer 18

the neurohypophysis

Question 19

what does oxytocin cause

Answer 19

contraction of the myoepithelial cells in the mammary wall (milk let down)

Question 20

what antagonises the oxytocin effect

Answer 20

adrenaline

Question 21

how many complexes in each species:
ca
eq
ru
sus
small ru

Answer 21

ca - 8-12
eq - 2
ru - 4
sus - 14
small ru - 2

Question 22

blood system in bo

Answer 22

a pudenda externa gives a mammillares cran and caud that anostomose with a epigastrica cran
a pudenda interna gives branch to udder caudally