WEEK 8

Question 1

Lips

Answer 1

• orbiculairis oris m.
• innervated by branches of facial nerve CN VII
• blood supply by branches of facial artery

Question 2

Teeth

Answer 2

• made of dentin converted in enamel (harvests vubstance in body)
• located in maxilla & mandible
• infant: 20 deciduous teeth
• adult: 32 permanent teeth
• incisors, canine, premolars, molars

Question 3

Tongue

Answer 3

• separated into two sections (epithelia come from different parts of embryo, have different texture, have different innervation)
• anterior: oral ectoderm, smoother, taste by fascial nerve CN VII
• posterior: foregut endoderm, lumpier, taste by glossopharyngeal nerve CN IX
• general sensation for all of tongue is by lingual branch of trigeminal nerve CN V
• functions: taste, mastication, speech, swallowing

Question 4

Muscles of the tongue

Answer 4

• intrinsic and extrinsic muscle
• skeletal muscle innervated by hypoglossal nerve CN XII
• genioglossus is the largest muscle of the tongue