Unit III - Frontal bone

Question 1

What are the 4 parts of the frontal bone?

Answer 1

External surface

Internal surface

Orbital part

Frontal sinus

Question 2

What are the 2 parts of the external surface of the frontal bone?

Answer 2

Glabella

Supraorbital margin

Question 3

What attaches to the supraorbital margin?

Answer 3

orbicularis oculi muscle

attachment: orbital margin and medial palpebral ligament –> superficial fascia of the eyelid
function: palpebral sphincter
innervation: temporal and zygomatic branches of the facial n.
blood supply: superficial temporal, lacrimal, supraorbital, supratrochlear, dorsal nasal, angular, infraorbital and transverse facial a.

Question 4

What is the function of the supraorbital notch or forament?

Answer 4

transmits the supraorbital n., a., v.

Question 5

What is the function of the groove for the superior sagittal sinus of the internal surface of the frontal bone?

Answer 5

houses the superior sagittal sinus

Question 6

What are the 3 parts of the orbital part of the frontal bone?

Answer 6

fossa for the lacrimal gland

anterior ethmoidal foramen

posterior ethmoidal foramen

Question 7

What is the function of the fossa for the lacrimal gland?

Answer 7

houses the lacrimal gland

Question 8

What is the function of the anterior ethmoidal foramen?

Answer 8

transmits the anterior ethmoidal n., a., v.

Question 9

What is the function of the posterior ethmoidal foramen?

Answer 9

transmits the posterior ethmoidal n., a., v.