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227 .205 (15)

Bovine Head lecture 2nd year vet

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Massey University
227 .205
Peter Davie

Bovine Head Friday A) Lateral view of bovine skull 1) Incisor 2) mental foramen 3) maxilla 3’) facial tuberosity (facial crest) 3”) infraorbital foramen(infraorbital n from maxillary nerve innervate upper lip and nose ) 4) nasal bone 4’) nasoma..... notch 5) frontal 5’)temporal line 5”) temporal fossa. 6) orbit 7) zygomatic bone 7’) zygomatic arch 8) 9) 10) 11) B) Nasolabial plate/muzzle - pattern is different from each other like human finger prints. -distinct, no two animals have similar just liek finger prints can use for identification -muzzle is moist c) the lymph drainage of the head and neck(ox): 1) mandibular lymph node 2) parotid lymph node 3) medial retropharyngeal lymph node 4) lateral retropharyngeal lymph node 5) deep cervical lymph node 6) superficial cervical lymph nodes 7) tracheal duct 8) thoracic duct 9)area within which lymphatic vessels enter veins 10) main ones: a) parotid lymph node b) mandibular lymph node c) medial retropharyngeal lymph node all drain into the lateral retropharyngeal lymph node(largest lymph node and main collecting centre of the head)  then drains into the tracheal duct thoracic duct  vena cava  heart 11) lateral retropharyngeal node - important for TB(tuberculosis). The lesion is abnormality of the structure: there will be discoloration, pus, caseation. -bacteria spreads through the lymph to the lung - TB is a zoonotic disease- can be transmitted to humans D)superficial structures of head: 1) masseter 2)zygomaticus 3)buccinators 4) facial vein 5)dorsal branch of facial nerve 6) ventral branch facial nerve 7) auriculotemporal nerve 8) cornual nerve 9) infraorbital nerve 10) parotid duct and facial vein 11)parotid gland 12)mandibular gland 12) parotid lymph node 14)lateral retropharyngeal lymph node 15)spinal accessory nerve 16) maxillary vein 17) external jugular vein 18) linguaofacial vein 19) common carotid artery 20)mandibular lymph node 21) cornual diverticulum of frontal sinus 22) ox -facial branches are different from dog. The ventral buccal is more caudal and medial to the ramus accompanying artery and vein. -facial artery and vein and parotid gland. 23) in dog – Parotid gland is between the dorsal and ventral buccal branch 24)auriculopalpebral block-cattle Auriculopalpebral nerve supplies motor fibres to the orbicularis oculi muscle Indication: examition of the eyeball Site: rostral to the base of the ear at the caudo-dorsal edge of the zygomatic arch. injury occulopalpebral nerve- cause muscle paralysis of orbicularis oculi will cause drooping of eyelid and external ear. To do eye check, u can block the orriculopalpebral nerve. So can easily check the eye. 25) dorsal buccal branch injury-cause facial asymmetry and lip will be deviated to the not affected side. The buccinator muscle will be affected causing food to collect between the buccca ans the oral cavity. 26)paranasal sinuses: sinuses develop is to increase size without increase in weight. 27) Sinuses - the frontal and maxillary sinus don’t communicate in ox. a) frontal sinuses rostral frontral sinus- medial and lateral both communicate with ethmoid structure. Caudal frontal sinus - largest
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