A31 - The cardiovascular and nervous system of the domestic birds Flashcards

1
Q

Cardiovascular system

Heart

A
  • Location: between 2nd and 5th rib
    • Between and in front of the lobes of the liver
    • Attached to sternum via pericardium
  • Cone shaped
  • Covered in fat
  • Have auricles (but not always visible)
  • 4 chambers
  • Right atrium
    • Veins:
      • Vena cava cranialis dexter
      • Vena cava cranialis sinister
      • Vena cava caudalis
    • Right atrioventricular valve
      • Formed by a single muscle flap
  • Left atrium:
    • Left atrioventricular valve
      • Has 3 cusps attached to chordae tendinae
    • Pulmonary trunk enters left atrium
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2
Q

Cardiovacular system

Kidney

A
  • Division:
    • Cranial division
    • Medial division
    • Caudal division
  • Birds can turn off blood flow to kindey and redirect it elsewhere when needed
  • Valva renalis:
    • Muscular ring around v. iliaca communis
    • Can regulate width - never just open or close
    • 2 valves work independently
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3
Q

Cardiovascular system

Liver portal system

A
  • The right and left lobes of the liver are responsible for different parts of the GI-tract
    • V. portalis hepatis dexter
      • Muscular stomach
      • Pancreas
      • Large intestines
    • V. portalis hepatis sinister
      • Mucosal (glandular) stomach
      • Crop
    • V. mesenterica caudalis
      • Connected to caudal end of renal portal system → kidney
      • Some blood from the GI-tract can return to the heart without passing through the liver
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4
Q

Cardiovascular system

Draw the circulation system

A
  • Open valve → flying mode
    • Vv. efferentes
  • Closed valve → rest mode
    • Vv. afferents
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5
Q

Nervous system

Brain

A
  • Small
  • 12 paris of cranial nerves
    • Same distribution as mammals (ø n. opticus
  • Meninges is the same as in mammals:
    • Dura mater
    • Arachnoidea
    • Pia mater
  • Cerebrum
    • Ø grooves or ridges
    • Sulcus sylvii
    • 2 hemispheres
  • Cerebellum
    • ​Not as developed as in mammals
    • Vermis & grooves
    • Role: flying, moving, etc.
  • Far less grey matter than in mammals

Figure: n. opticus cross over

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6
Q

Nervous system

Spinal cord

A
  • Ventral horn is much bulkier in birds
  • Corpus gelatinosa: between S3-S6
  • Canalis centralis: runs in between dorsal horns
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7
Q

Nervous system

Peripheral nerves

A
  • Brachial plexus
    • ​Dorsal & ventral plexuses
      • ​Plexus brachialis accessorius
  • The last 2 cervical, and first 2 thoracic spinal nerves form plexus
    • 2 roots:
      • Fasciculus dorsalis (extensor muscles)
      • Fasciculus ventralis (flexor muscles)
    • Supplies the wings
  • Lumbar & sysacral plexus
    • Passes through the kidney region
    • N. ischiadicus
      • Location:
        • Over a/v. ischiadica
        • Between medial and caudal kidney division
        • Between kidney and bowels
      • Clinical importance: Marek disease
        • First sign visible on n. ischiadicus (swells up)
        • Kidney disease
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