anterior cranial fossa.pptx

The floor of the cranial cavity is divided into three distinct depressions. They are known as the anterior cranial fossa, middle cranial fossa and posterior cranial fossa. Each fossa accommodates a different part of the brain

1. Anterior Cranial fossae

2. Contents Introduction Boundaries Anterior Cranial Fossae Clinical Correlates Summary MCQs References

3. Base of skull divide into Anterior cranial fossae Middle cranial fossae Posterior cranial fossae

4. Posterior border of lesser wing of sphenoid Anterior border of sulcus chiasmaticus in median region Anterior and middle cranial fossae separated by

5. Boundaries of anterior cranial fossae Anterior & lateral - Frontal bone Floor – By three bone Cribriform plate of ethmoid Orbital plate of frontal bone Lesser wing with jugum sphenoidale of sphenoid bone

6. Foramen & Structure Cribriform plate - Olfactory nerve Anterior ethmoidal canal -Anterior ethmoidal nerve & vessels Posterior ethmoidal canal- Posterior ethmoidal nerve & vessels Crista galli

7. Ossification Crista galli begins to ossify from tip at 3 months in IUL and is usually ossified by first year. Most of anterior skull base, including cribriform plates, are ossified after 2 years of birth

8. Midline sagittal reformation of CT scan Foramen cecum (FC ) Crista galli (CG ) Cribriform plate (CP ) Planum sphenoidale (PS)

9. Clinical Aspect

10. Midline frontal bone fracture Fractures involving Orbital roof Cribriform plate Supraorbital nerve injury Fractures of posterior wall of frontal sinus Cerebrospinal fluid (CSF) rhinorrhea 5. Complete bitemporal hemianopia   Treatment Removal of posterior wall and all frontal sinus mucosa, typically through a frontal craniotomy approach

11. MCQ’s A conical projection grows upward from the cribriform plate is called as crista galli and at what age it is ossified? 3 rd month after birth First year after birth 3 rd month in IUL 6 th month in IUL First year after birth

12. Name the structure which passes from below A marked area. Olfactory nerve Anterior ethmoidal nerve Posterior ethmoidal nerve Emissary vein A Olfactory nerve

13. A severe RTA accident case came to an emergency department. To rule out any fracture doctor suggest X- ray of skull. Which shows a midline frontal fracture (as shown in given image) and patient has a blood-stained discharge of CSF from nose (CSF rhinorrhea ). What is cause for the discharge of CSF from nose? Cribriform plate fracture Human osteology by AK Datta 3 rd edition , pg no 116

14. References Gray's Anatomy_ The Anatomical Basis of Clinical Practice, 41e Essential of human osteology ,2 nd edition by A.K. Datta

15. Thank You