Frontal bone : short description for viva exam

 

Frontal bone

1.    Anatomical points:

·  Squamous part of frontal bone lies vertically

·  Orbital plates are directed downward and horizontally

·  Nasal spine is directed downward and forward

 

2.   Morphological type: pneumatic flat bone   

3.    Structure of bone : Frontal bone is formed by inner and outer table (compact bone) and middle diploe (sgongy bone)

4.   Ossification : intramembranous ossification (it is ossify from membrane )

5.    Development : Neural crest ( derived from ectoderm)

 6.   Parts:  Identify

·       Squamous part:

-        External surface of squamous part : Frontal tuberosity / supercilliary arch / supraorbital margin/ superobital notch or foramen / glabella

-        

-        Internal surface of squamous part : impression for cerebral sulci and gyri / sagittal sulcus or groove for superior sagittal sinus / frontal crest / foramen caecum

-        ·       Orbital part,

·       ·       Zygomatic processes

·       Nasal notch : name of the bones articulate with nasal notch

·       Right side (from medial to lateral ) right nasal bone,  right frontal process of maxilla and right lacrimal bone

·       Left side (from medial to lateral ) left nasal bone,  left frontal process of maxilla and left lacrimal bone

·       

·       Ethmoidal notch:  name of the bone articulate with ethmoidal notch?

·        Ethmoid notch is situated in between two orbital plates and articulated by cibriform plate of ethmoid

 

7.   What is metopic suture?

8.   Which bones are articulated with nasal notch:

9.   Which bone is articulated with ethmoid notch 

10.                    coronal suture: which bones forms this suture,

11.                    Foramen related to this bone and structure passing through it

12.                   Show lacrimal fossa, what structure lodge within it:

13.                   Lacrimal gland: Nerve supply