Digestive system

Question 1

lips muscle nerve artery

Answer 1

orbicularis oris
facial nerve CN VII
facial artery

Question 2

oral cavity components

Answer 2

hard palate (bone, anterior), soft palate (muscle, posterior), tongue teeth salivary glands

Question 3

how many teeth location and what its made of

Answer 3

dentin covered by enamel
maxilla and mandible
20 dedicious teeth in babies, 32 permanent teeth

Question 4

tongue parts texture and innervation

Answer 4

anterior: oral ectoderm, smoother, facial nerve
posterior: foregut ectoderm, lumpier, taste by glossopharyngeal nerve

general touch by trigeminal nerve

Question 5

composition of taste buds

Answer 5

50 to 100 cells, 50% gustatory, 50% stem cells

Question 6

tongue muscles and innervation

Answer 6

4 intrinsic starts and ends in tongue, changes shape
4 extrinsic starts or ends in tongue and somewhere else, eg genioglossus

innervated by hypoglossal nerve

Question 7

salivary gland innervation and contribution to saliva

Answer 7

parotid: 30%, serous only, glossopharyngeal
sublingual: 5%, more mucous than serous, facial
submandibular: 70% more serous than mucous, facial

Question 8

pharynx muscles and innervation

Answer 8

3 pairs of constrictors, superior, middle, inferior, vagus nerve

Question 9

oeosophagus

Answer 9

skeletal to smooth muscle
circular and longitudinal layer for peristalsis

Question 9

stomach description

Answer 9

fundus –> cardia –> body –> pylorus
cardiac and pyloric sphincter
rugae (gastric folds) allow extension of stomach