(There are often small holes on both sides of the back part, namely the top hole)

Composed of the orbital part of the frontal bone, the cribriform plate of the ethmoid bone, and the lesser wing of the sphenoid bone

crest

Sieve plate

Ehmoid foramen (I olfactory nerve)

It is composed of the body of the sphenoid bone, the greater wing, and the petrous part of the temporal bone. Narrow in the middle and broad on both sides.

It is separated from the posterior cranial fossa by the upper edge of the petrous part of the temporal bone and the dorsum sellae.

pituitary fossa

Optic canal (II optic nerve)

rupture hole

Internal carotid canal (internal carotid artery)

Superior orbital fissure (Ⅲ oculomotor nerve, Ⅳ trochlear nerve, Ⅴ1 ophthalmic nerve, Ⅵ abducens nerve)

Foramen rotundum (V2 maxillary nerve)

Foramen ovale (V3 mandibular nerve)

foramen spinosum (middle meningeal artery)

trigeminal nerve imprint

Mainly composed of the occipital bone and the posterior part of the petrous part of the temporal bone

foramen magnum

intraoccipital protuberance

Hypoglossal nerve canal (XII hypoglossal nerve)

transverse sinus groove

Foramen of Jervis (internal jugular vein, Ⅸ glossopharyngeal nerve, Ⅹ vagus nerve, Ⅺ accessory nerve)

Inner ear gate (VII facial nerve, VIII vestibulocochlear nerve)

wing point

four walls

Connected

Connected

Deep frontal sinus

Upper wall anterolateral lacrimal fossa, containing lacrimal gland

Medial wall lacrimal sac fossa, containing the lacrimal sac

Inferior wall Infraorbital fissure, infraorbital groove, infraorbital canal

Lateral wall superior orbital fissure

Opening: Ehmoid funnel in front of middle meatus

Opening: The anterior and middle groups open into the middle meatus, and the posterior group opens into the superior meatus.

Opening: Sphenoethmoidal recess

Opening: Half-lunar hiatus of middle meatus

The ostium of the sinus is higher than the floor of the sinus, so when fluid accumulates in the sinus, it is difficult to drain in the upright position.