ANHB3324 Lecture Notes - Lecture 9: Spinal Nerve, Olfactory Mucosa, Maxillary Artery
3 Jun 2018
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LECTURE NINE: Palate and Nasal Cavity
Functions of the Palate:
• Hard palate (oral)
o Divider of oral and nasal cavity
o Used in mastication and speech
• Soft palate (pharyngeal)
o Key function is swallowing
o Important in speech
Embryological Development:
• Initially there is no palate
• Large space → primitive stomodeum
• Found beneath developing forebrain
• 2 sheets of tissue grow vertically down sides of opening
• Then slowly fold upwards to fuse in midline to form palate separating
nasal and oral cavity
• Forms vertically not horizontally because tongue takes up most of room
• Process of folding up → fuses with premaxillary region and nasal septum
Hard Palate:
• Skeletal base
o Maxilla and palatine bones
o Fused together with immovable sutures
• Mucosa
o Anterior
▪ Thick and tough parakeratinised epithelium
▪ Underlying tissues → dense collage tightly bound to bone
with fat pads
o Posterior
▪ Soft and glandular
▪ Much looser than anteriorly
• Nerve supply
o Greater palatine nerve
o Long spheno-palatine nerve
• Blood supply
o Greater palatine arteries
o Naso-palatine arteries
• Venous drainage
o Pharyngeal plexus → deep to peterygoid plexus
o Internal jugular vein
• Lymphatic drainage to sub-mandibular nodes
Soft Palate:
• Main function is to close nasopharynx during swallowing
• Top surface is nasal cavity and lower surface is oral cavity
• Muscles
o Key feature of soft palate
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