Lab 17 The Head

Question 1

Dorsal and Ventral buccal branches clinal significance

Answer 1

they are very superficial so they are at risk of injury

Question 2

mandibular foramen

Answer 2

• perform mandibular nerve block via this foramina as inferior alveolar nerve enters the foramen on medial aspect of mandible
• located on medial surface of mandible (medial surface of ramus of mandible)

Question 3

maxillary foramen

Answer 3

just cd and slightly v to bony orbit where maxillary nerve runs through

Question 4

what veins form large dilated regions deep to masseter

Answer 4

• transverse facial vein (D)
• deep facial vein
• buccal vein (V)

Question 5

why do the transverse and deep facial veins and buccal vein form large dilated regions

Answer 5

provide an area for blood to pool when head is lowered for graazing; contraction of masseter while grazing helps pump pooled blood back into systemic circulation

Question 6

transverse facial, deep facial, and buccal vein all drain to

Answer 6

facial vein which goes to linguofacial vein then to external jug

Question 7

hypoglossal nerve

Answer 7

large; crosses lateral surface of external carotid artery near origin of lunguofacial

Question 8

glossopharyngeal nerve

Answer 8

smaller than hypoglossal nerve; lies medial to artery on mucous membrane of guttural pouch

Question 9

levator nasolabialis

Answer 9

runs from middle of nose (facial crest?) to lip

Question 10

levator labii superioris

Answer 10

• deep to levator nasolabialis

- arises rostral to the eye and with a long tendon passes between the nostrils into the upper lip which it raises

Question 11

depressor labii ineferioris

Answer 11

on mandible, have to displace (depress) this to get to mental foramen

Question 12

buccinator

Answer 12

goes from under masseter to cheek this is dorsal to depressor labii inferioris

Question 13

orbicularis occuli

Answer 13

circular muscle around the eye

Question 14

orbicularis oris

Answer 14

circular(ish) muscle around the mouth/ lips

Question 15

what do you have to elevate to palpate infraorbital foramen

Answer 15

have to transect levator nasolabalis; push the levator labii superioris dorsally

Question 16

auricolotemporal nerve

Answer 16

comes from facial; runs rostrally starting right around ramus of mandible just v to eye level

Question 17

auriculopalpebral nerve

Answer 17

from facial nerve; goes up to forehead just rostral to base of ear

Question 18

external jugular vein splits to

Answer 18

linguofacial vein and maxillary vein

Question 19

facial artery

Answer 19

branch off of linguofacial artery; runs through vascular notch on mandible

Question 20

masseteric artery

Answer 20

runs v superficially along masseter this is cd to linguofacial artery