Unit 4 - Head and Neck: Cranial Fossae (Ex. III)

Question 1

A cranial fossa

Answer 1

formed by:
  - F bone
  - ethmoid bone
  - lesser wing of sphenoid bone
contents:
  - F lobe 
  - olfactory bulbs

Question 2

middle cranial fossa

Answer 2

formed by:
  - greater and lesser wings of sphenoid bone
  - squamous and petrous parts of T bones
contents:
  - T lobes
  - optic chiasm
  - pituitary gland
separated by hypophyseal fossa

Question 3

P cranial fossa

Answer 3

formed by:
  - O bone
  - petrous parts of T bones
contents:
  - pons
  - medulla --> exits via foramen magnum in floor of fossa
  - cerebellum
  - grooves on P and L walls accommodate transverse and sigmoid dural sinuses

Question 4

What do they divide?

Answer 4

floor of cranial cavity