Practical topic 3

Question 1

M. nasolabialis (m. levator nasolabialis)

Answer 1

Origin:

• Frontal region between the orbit: nasolateral fasciae
• Medial palpebral ligament
• Maxillary bone

Insertion:

• Edge of the superior lip
• On the nares (nostrils)

Action:

• Dilates nostrils
• Raise/levitate upper lip

Innervation:

• N. auricopalpebralis (ex. n. facialis (cranial nerve VIII))

Question 2

N. infraorbitalis

Ex. from

Answer 2

Ex. N. maxillaris (V₂) ex. n. trigeminus

Question 3

N. infraorbitalis

Type of nerve

Answer 3

Sensory nerve

Question 4

N. infraorbitalis

Gives off…

Answer 4

Gives off: Alveolar branch

Question 5

N. infraorbitalis

Extracranially, it fans out and divides into several branches…

Answer 5

• Rr. nasales externi
• Rr. nasales interni
• Rr. labialis superior

Question 6

N. buccalis

Ex. from

Answer 6

Ex. n. mandibularis (V₃) ex. n. trigeminus (V)

Question 7

N. buccalis

Type of nerve

Answer 7

Sensory to mucosa and skin of the cheek

Question 8

N. mentalis

Ex. from

Answer 8

Ex. n. mandibularis (V₃) Ex. n. trigeminus (V)

Question 9

N. mentalis

Type of nerve

Answer 9

Sensory to skin and mucosa of lower lip and chin

Question 10

V. facialis

Which veins does it drain into?

Answer 10

Drains into v. linguofacialis → drains into v. jugularis externa

Question 11

V. facialis

branches

Answer 11

1. V. submentalis (terminates either in v. labialis inferior or arcus hyoideus)
2. V. labialis inferior
3. V. labialis superior
4. V. profunda faciei (into m. masseter)
5. V. angulus oris
6. V. nasalis lateralis
7. V. nasalis dorsalis
8. V. angularis oculi

Question 12

V. angularis oris

1. Drains
2. Exit

Answer 12

1. Drains:
   
   • M. orbicularis oris
   • M. alveolaris mandibularis
   • M. maxillaris
2. May exit from one of them:
   
   • V. facialis
   • V. labialis inferior
   • V. labialis superior

Question 13

Gl. zygomatica

Localization

Answer 13

Lies deep to arcus zygomaticus

Question 14

Answer 14

1. V. jugularis externa
2. V. maxillaris
3. V. linguofacialis
4. V. auricularis caudalis
5. V. temporalis superficialis
6. V. lingualis
7. V. facialis
8. V. labialis inferior
9. V. labialis superior

Question 15

Answer 15

1. V. angularis oculi
2. V. nasalis dorsalis
3. V. nasalis lateralis
4. V. facialis
5. V. labialis superior
6. V. linguofacialis
7. V. maxillaris
8. V. jugularis externa
9. Gl. mandibularis

Question 16

Lateral view of the orbit following removal of the periorbita

Answer 16

1. Extrinsic eye muscles
2. Gl. lacrimales
   
   • Deep to lig. orbitalis
3. Lig. orbitalis
4. Processus zygomaticus
5. Gl zygomatica
   
   • Ventral to the orbit
6. Fossa temporalis
   
   • Temporal muscles is removed
7. Orbit and vessels
8. M. pterygoideus