Proximal GIT I

Question 1

which muscle allows lips to move and what is it innervated by

Answer 1

• Orbicularis oris m. (muscle allows to move lips)

o Innervated by branches of facial nerve (7th cranial) (buccal & marginal mandibular).

Question 2

what are the blood supply of lips and why are they the length they are

Answer 2

o Blood supply by branches of facial artery (superior & inferior labial arteries).
• Both arteries long= bc need to move with face + head movements

Question 3

lips= internal vs external epithelium

Answer 3

External
= thinner outside bc inside (oral mucosa) up against teeth // thicker for protection
= Hair on outside chin

Internal
= thick strat squa
= glands > needs moist surface (lubricates to move teeth without teeth adhesion)
• Inner + top lip= keratinzed (= lubrication)

Question 4

where are the circumvallate papillae

Answer 4

back of tongue

Question 5

types of lingual papillae

Answer 5

circumvallate, fileform, fungiform

Question 6

what are muscles of the tongue innervated by

Answer 6

hypoglossal nerve (12)

Question 7

3 extrinsic muscles of tognue

Answer 7

styloglossus hypoglossus, genioglossus

Question 8

3 intrinsic muscles of tongue

Answer 8

superior long, transverse + vertical, inferior long

Question 9

what is the nerve that provides the tongue with sense

Answer 9

major branch of Trigeminal nerve (5)

o Also carries nerves from facial below tongue to glands (crinkled)= looks like pancreas glands

Question 10

characteristics of serous salary glands

Answer 10

dark pink with dark purple nuclei)

Question 11

describe filiform papillae

Answer 11

small keratinised bristled on stratified (protection)

Question 12

describe fungiform papillae

Answer 12

• Larger than filiform
• On bottom (lighter areas)= taste buds
• Coming into crevice= serous gland
o Dissolves food or drink that gets stuck in crevice which then gets sucked into pore of taste receptor
• Allows taste buds to sample
o Taste buds at top= non ideal as would be easily damaged, cannot keep dissolved

Question 13

describecircumvallate papillae

Answer 13

• Largest

* Inferior surface= taste cells + mass of serous glands underneath

Question 14

describe taste receptors

Answer 14

• Multiple filaments that each open into poor
• Each filament= has nerve fibre
• Facial nerve takes taste to brain (timpani branch)

Question 15

define salivon

Answer 15

basic secretory unit of salivary glands

Question 16

4 parts of gland

Answer 16

acini
intercalated duct
striated duct
excretory duct

Question 17

types of acini (columnar)

Answer 17

o Red= serous (mid placed nucleus)

o Yellow = mucus (large cyto, low nucleus)

Question 18

characteristic of intercalated ducts

Answer 18

low cuboidal

Question 19

characteristic of striated duct

Answer 19

epithelium height increases to columnar (striated bc of infoldings of basal lamina= due SA for transport)

Question 20

characteristic of excretary duct

Answer 20

starified