TOPIC 23B Mammary gland, blood supply and innervation Flashcards
what is a mammary gland
modified sweat gland of exocrine and tubuloalveolar type
what does a complex consist of
body (corpus) and teat (papilla)
what does mammary body consist of
glandular and dense ct
what do units end as
ducts with species specific arrangement
components of the duct system
glandular alveolus
ductus lactiferi and sinus lactiferi
what does glandular alveolus do
produces milk
what does sinus lactiferi consist of
gland sinus and teat sinus
system of drainage
- intralobular ducts drain lobuli glandulae mammari
- joins to larger interlob duct - drians multiple intra lobulares
- leads to lactiferous ducts which drain the mammary lobe
name 5 parts of suspensory apparatus
- external fascia of trunk supt and deep
- lamina lateralis - dense CT
- lamina medialis - elastic tissue
- lamellae suspensoriae - bw mammary complexes
- sulcus intermammarias
blood supply
- a. epigast cran supf
- a. epigast caud supf
- a. thoracica interana
- a. thoracica lat (ca, sus)
which arteries make up the thoracic and cranial abdominal complex
a epigastrica cran supf and a thoracica interna
which artery is known as the ‘milk vein’
a epigastrica caud supf
which artery is only for ca and swine
a thoracica lateralis
which nerves innervate the mammary glands (5)
Nn intercostalis n iliohypogastric n genitofemoralis n ilioinguinale n pudenda
which lymphnodes are present at mammary glands
ln axillaris
ln medial iliac
ln inguinalis supf
what is responsible for initiating and maintaining lactation
the neurohormonal reflex arc
what does suckling stimulate
sensory nerves which conduct impulses to the CNS and tell the hypothalamus to produce oxytocin
where is oxytocin released through
the neurohypophysis
what does oxytocin cause
contraction of the myoepithelial cells in the mammary wall (milk let down)
what antagonises the oxytocin effect
adrenaline
how many complexes in each species: ca eq ru sus small ru
ca - 8-12 eq - 2 ru - 4 sus - 14 small ru - 2
blood system in bo
a pudenda externa gives a mammillares cran and caud that anostomose with a epigastrica cran
a pudenda interna gives branch to udder caudally
